Oracle查询dba_extents视图很慢
Oracle查询dba_extents视图很慢
问题描述
下边这条SQL查询每次大概要花1分钟左右，实在是比较异常。
select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name;
测试分析
先实际跑完一遍，去详细的执行信息。
模板复制：
set pagesize 9999 long 9999 line 500 alter session set statistics_level=all; select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name; select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));
执行时间如下：
20:25:06 SYS@anonymous> set pagesize 9999 long 9999 line 500 20:25:15 SYS@anonymous> alter session set statistics_level=all; Session altered. Elapsed: 00:00:00.00 20:26:33 SYS@anonymous> select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name; OWNER TABLESPACE_NAME ------------------------------ ------------------------------ SYS SYSTEM Elapsed: 00:01:01.87
获取执行计划：
20:27:48 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ SQL_ID dggb0d96bj8dy, child number 4 ------------------------------------- select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name Plan hash value: 1482657742 ------------------------------------------------------------------------------------------------------------------------------------------------------------ | Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem | ------------------------------------------------------------------------------------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 1 | | 1 |00:01:01.87 | 190K| 7157 | | | | | 1 | HASH GROUP BY | | 1 | 543K| 1 |00:01:01.87 | 190K| 7157 | 2331K| 2194K| 435K (0)| | 2 | VIEW | DBA_EXTENTS | 1 | 543K| 259 |00:01:01.87 | 190K| 7157 | | | | | 3 | UNION-ALL | | 1 | | 259 |00:01:01.87 | 190K| 7157 | | | | | 4 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | | 5 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | | 6 | TABLE ACCESS FULL | UET$ | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | |* 7 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 8 | VIEW | SYS_DBA_SEGS | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 9 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | 0 | | | | | 10 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 11 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 12 | MERGE JOIN CARTESIAN | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 13 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 14 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 15 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 16 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 17 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 18 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 20 | BUFFER SORT | | 0 | 2 | 0 |00:00:00.01 | 0 | 0 | 73728 | 73728 | | |* 21 | INDEX SKIP SCAN | I_OBJ2 | 0 | 2 | 0 |00:00:00.01 | 0 | 0 | | | | | 22 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 23 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 24 | VIEW | SYS_OBJECTS | 0 | 5 | 0 |00:00:00.01 | 0 | 0 | | | | | 25 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | 0 | | | | |* 26 | TABLE ACCESS CLUSTER | TAB$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 27 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 28 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 29 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 30 | TABLE ACCESS CLUSTER | CLU$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 31 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 32 | TABLE ACCESS BY INDEX ROWID | IND$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 33 | INDEX UNIQUE SCAN | I_IND1 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 34 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 35 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 36 | TABLE ACCESS BY INDEX ROWID | LOB$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 37 | INDEX UNIQUE SCAN | I_LOB2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 38 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 39 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 40 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 41 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 42 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 43 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 44 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 45 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 46 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 47 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 48 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 49 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 50 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 51 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 52 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 53 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 54 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 55 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 56 | INDEX RANGE SCAN | I_UNDO2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 57 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 58 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 59 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 60 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 61 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 62 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 63 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 64 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 65 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 66 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 67 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 68 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 69 | HASH JOIN | | 1 | 543K| 259 |00:01:01.87 | 190K| 7157 | 1214K| 1214K| 709K (0)| |* 70 | HASH JOIN | | 1 | 20549 | 1 |00:00:00.33 | 138K| 0 | 1969K| 1969K| 1531K (0)| | 71 | INDEX FULL SCAN | I_FILE2 | 1 | 106 | 108 |00:00:00.01 | 1 | 0 | | | | | 72 | VIEW | SYS_DBA_SEGS | 1 | 6785 | 1 |00:00:00.33 | 138K| 0 | | | | | 73 | UNION-ALL | | 1 | | 1 |00:00:00.33 | 138K| 0 | | | | | 74 | NESTED LOOPS | | 1 | 6783 | 1 |00:00:00.32 | 137K| 0 | | | | | 75 | NESTED LOOPS OUTER | | 1 | 2 | 10578 |00:00:00.10 | 21543 | 0 | | | | | 76 | MERGE JOIN CARTESIAN | | 1 | 2 | 10578 |00:00:00.07 | 10961 | 0 | | | | | 77 | NESTED LOOPS | | 1 | 1 | 10578 |00:00:00.06 | 10896 | 0 | | | | | 78 | NESTED LOOPS | | 1 | 1 | 10578 |00:00:00.03 | 314 | 0 | | | | |* 79 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 10578 |00:00:00.02 | 310 | 0 | | | | |* 80 | INDEX UNIQUE SCAN | I_FILE2 | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | | | 81 | TABLE ACCESS CLUSTER | TS$ | 10578 | 1 | 10578 |00:00:00.02 | 10582 | 0 | | | | |* 82 | INDEX UNIQUE SCAN | I_TS# | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | | | 83 | BUFFER SORT | | 10578 | 2 | 10578 |00:00:00.01 | 65 | 0 | 2048 | 2048 | 2048 (0)| |* 84 | INDEX SKIP SCAN | I_OBJ2 | 1 | 2 | 1 |00:00:00.01 | 65 | 0 | | | | | 85 | TABLE ACCESS CLUSTER | USER$ | 10578 | 1 | 10578 |00:00:00.02 | 10582 | 0 | | | | |* 86 | INDEX UNIQUE SCAN | I_USER# | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | | |* 87 | VIEW | SYS_OBJECTS | 10578 | 2 | 1 |00:00:00.22 | 116K| 0 | | | | | 88 | UNION ALL PUSHED PREDICATE | | 10578 | | 10578 |00:00:00.21 | 116K| 0 | | | | |* 89 | TABLE ACCESS CLUSTER | TAB$ | 10578 | 1 | 10578 |00:00:00.03 | 21161 | 0 | | | | |* 90 | INDEX UNIQUE SCAN | I_OBJ# | 10578 | 1 | 10578 |00:00:00.01 | 10583 | 0 | | | | | 91 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | | |* 92 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | | | 93 | TABLE ACCESS CLUSTER | CLU$ | 10578 | 1 | 0 |00:00:00.02 | 21161 | 0 | | | | |* 94 | INDEX UNIQUE SCAN | I_OBJ# | 10578 | 1 | 10578 |00:00:00.01 | 10583 | 0 | | | | |* 95 | TABLE ACCESS BY INDEX ROWID | IND$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | | |* 96 | INDEX UNIQUE SCAN | I_IND1 | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | | | 97 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | |* 98 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | |* 99 | TABLE ACCESS BY INDEX ROWID | LOB$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | | |*100 | INDEX UNIQUE SCAN | I_LOB2 | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | | | 101 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | |*102 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | | 103 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | |*104 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | | 105 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | |*106 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | | | 107 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | | | 108 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | | | 109 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | | | 110 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | | |*111 | TABLE ACCESS BY INDEX ROWID| UNDO$ | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | | |*112 | INDEX RANGE SCAN | I_UNDO2 | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | | |*113 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*114 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*115 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 116 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*117 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 118 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*119 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 120 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | | 121 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | | 122 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | | 123 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | |*124 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | | | 125 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*126 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 127 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*128 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*129 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |*130 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 131 | FIXED TABLE FULL | X$KTFBUE | 1 | 100K| 723K|00:01:01.20 | 52350 | 7157 | | | | ------------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id): --------------------------------------------------- 7 - access("E"."TS#"="F"."TS#" AND "E"."FILE#"="F"."RELFILE#") 15 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#") 17 - access("TS"."TS#"="E"."TS#") 18 - filter((BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0)) 19 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#") filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")) 21 - access("O"."NAME"='AUD$') filter("O"."NAME"='AUD$') 23 - access("O"."OWNER#"="U"."USER#") 24 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND "S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID")) 26 - filter(("T"."BLOCK#"="E"."SEGBLOCK#" AND "T"."FILE#"="E"."SEGFILE#" AND "T"."TS#"="E"."TS#" AND BITAND("T"."PROPERTY",1024)=0)) 27 - access("T"."OBJ#"="O"."OBJ#") 28 - filter(("TP"."BLOCK#"="E"."SEGBLOCK#" AND "TP"."FILE#"="E"."SEGFILE#" AND "TP"."TS#"="E"."TS#")) 29 - access("TP"."OBJ#"="O"."OBJ#") 30 - filter(("C"."BLOCK#"="E"."SEGBLOCK#" AND "C"."FILE#"="E"."SEGFILE#" AND "C"."TS#"="E"."TS#")) 31 - access("C"."OBJ#"="O"."OBJ#") 32 - filter(("I"."BLOCK#"="E"."SEGBLOCK#" AND "I"."FILE#"="E"."SEGFILE#" AND "I"."TS#"="E"."TS#" AND INTERNAL_FUNCTION("I"."TYPE#"))) 33 - access("I"."OBJ#"="O"."OBJ#") 34 - filter(("IP"."BLOCK#"="E"."SEGBLOCK#" AND "IP"."FILE#"="E"."SEGFILE#" AND "IP"."TS#"="E"."TS#")) 35 - access("IP"."OBJ#"="O"."OBJ#") 36 - filter(("L"."BLOCK#"="E"."SEGBLOCK#" AND "L"."FILE#"="E"."SEGFILE#" AND "L"."TS#"="E"."TS#" AND (BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128))) 37 - access("L"."LOBJ#"="O"."OBJ#") 38 - filter(("TSP"."BLOCK#"="E"."SEGBLOCK#" AND "TSP"."FILE#"="E"."SEGFILE#" AND "TSP"."TS#"="E"."TS#")) 39 - access("TSP"."OBJ#"="O"."OBJ#") 40 - filter(("ISP"."FILE#"="E"."SEGFILE#" AND "ISP"."BLOCK#"="E"."SEGBLOCK#" AND "ISP"."TS#"="E"."TS#")) 41 - access("ISP"."OBJ#"="O"."OBJ#") 42 - filter(("LF"."BLOCK#"="E"."SEGBLOCK#" AND "LF"."FILE#"="E"."SEGFILE#" AND "LF"."TS#"="E"."TS#")) 43 - access("LF"."FRAGOBJ#"="O"."OBJ#") 49 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#") 51 - access("TS"."TS#"="E"."TS#") 52 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0)) 53 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#") filter("S"."TS#"="TS"."TS#") 55 - access("S"."USER#"="U"."USER#") 56 - access("UN"."NAME"='AUD$') 57 - filter(("UN"."BLOCK#"="E"."SEGBLOCK#" AND "UN"."FILE#"="E"."SEGFILE#" AND "UN"."TS#"="E"."TS#" AND "UN"."STATUS$"<>1 AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#" AND "S"."TS#"="UN"."TS#" AND "UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#")) 62 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#") 64 - access("TS"."TS#"="E"."TS#") 65 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1)) 66 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#") filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#" AND TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$')) 68 - access("S"."USER#"="U"."USER#") 69 - access("E"."KTFBUESEGFNO"="DS"."RELATIVE_FNO" AND "E"."KTFBUESEGBNO"="DS"."HEADER_BLOCK" AND "E"."KTFBUESEGTSN"="DS"."TABLESPACE_ID" AND "E"."KTFBUEFNO"="F"."RELFILE#") 70 - access("DS"."TABLESPACE_ID"="F"."TS#") 79 - filter((BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0)) 80 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#") 82 - access("S"."TS#"="TS"."TS#") 84 - access("O"."NAME"='AUD$') filter("O"."NAME"='AUD$') 86 - access("O"."OWNER#"="U"."USER#") 87 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND "S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID")) 89 - filter(BITAND("T"."PROPERTY",1024)=0) 90 - access("T"."OBJ#"="O"."OBJ#") 92 - access("TP"."OBJ#"="O"."OBJ#") 94 - access("C"."OBJ#"="O"."OBJ#") 95 - filter(("I"."TYPE#"=1 OR "I"."TYPE#"=2 OR "I"."TYPE#"=3 OR "I"."TYPE#"=4 OR "I"."TYPE#"=6 OR "I"."TYPE#"=7 OR "I"."TYPE#"=8 OR "I"."TYPE#"=9)) 96 - access("I"."OBJ#"="O"."OBJ#") 98 - access("IP"."OBJ#"="O"."OBJ#") 99 - filter((BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128)) 100 - access("L"."LOBJ#"="O"."OBJ#") 102 - access("TSP"."OBJ#"="O"."OBJ#") 104 - access("ISP"."OBJ#"="O"."OBJ#") 106 - access("LF"."FRAGOBJ#"="O"."OBJ#") 111 - filter("UN"."STATUS$"<>1) 112 - access("UN"."NAME"='AUD$') 113 - access("UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#") 114 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0)) 115 - access("S"."TS#"="UN"."TS#" AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#") 117 - access("S"."TS#"="TS"."TS#") 119 - access("S"."USER#"="U"."USER#") 124 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1)) 126 - access("S"."TS#"="TS"."TS#") 128 - access("S"."USER#"="U"."USER#") 129 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#") 130 - filter(TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$') 232 rows selected. Elapsed: 00:00:00.10
直接看id=131的那一行，时间都花在对固定表X$KTFBUE的全表扫描上，这个算是Oracle的一个BUG，当该固定表没有统计信息的时候，Oracle不会对他做动态采样，而是直接使用基数为100000的行。
查看索引的信息，固定表的索引有点奇怪：
SYS@zkm1> select * from V$INDEXED_FIXED_COLUMN where table_name='X$KTFBUE'; TABLE_NAME INDEX_NUMBER COLUMN_NAME COLUMN_POSITION ------------------------------ ------------ ------------------------------ --------------- X$KTFBUE 1 KTFBUESEGBNO 2 X$KTFBUE 1 KTFBUESEGFNO 1 X$KTFBUE 1 KTFBUESEGTSN 0
看不出啥。
百度或者mos上都可以查找到相关的原因和办法。
mos参考文档：Query Against DBA_EXTENTS Performs Slowly After Upgrade to 11.2.0.3 (Doc ID 1453425.1)
这篇文章有提供几种方法。
Gathering stats on the X$KTFBUE table using the following command:
EXEC DBMS_STATS.GATHER_TABLE_STATS('SYS', 'X$KTFBUE');For more information on gathering fixed table statistics see:
Document 798257.1 GATHER_FIXED_OBJECTS_STATS Considerations
OR
alter session set "_optimizer_cartesian_enabled" = false;OR
alter session set "_smm_auto_cost_enabled" = false;OR
Disable fix for unpublished Bug Bug 11814428: POOR CARDINALITY ESTIMATE FROM JOIN WITH A UNION-ALL VIEW:
alter session set "_FIX_CONTROL" = "11814428:0";
不过只有收集统计信息和最下边的BUG修复关掉才有效。
收集统计信息这个方法略过，因为还有一个表空间查询缓慢的问题和这个是一样的问题。
我们采用另外一种方法，关闭11814428的修复，执行：
20:30:19 SYS@anonymous> alter session set "_FIX_CONTROL" = "11814428:0"; Session altered. Elapsed: 00:00:00.00
之后再次运行变快了：
20:30:21 SYS@anonymous> select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name; OWNER TABLESPACE_NAME ------------------------------ ------------------------------ SYS SYSTEM Elapsed: 00:00:00.33
可以发现执行计划对X$KTFBUE已经采用了索引：
20:30:28 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ SQL_ID dggb0d96bj8dy, child number 5 ------------------------------------- select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name Plan hash value: 381184789 ------------------------------------------------------------------------------------------------------------------------------------------------------ | Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem | ------------------------------------------------------------------------------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 1 | | 1 |00:00:00.01 | 719 | | | | | 1 | HASH GROUP BY | | 1 | 729 | 1 |00:00:00.01 | 719 | 1646K| 1646K| 497K (0)| | 2 | VIEW | DBA_EXTENTS | 1 | 729 | 259 |00:00:00.01 | 719 | | | | | 3 | UNION-ALL | | 1 | | 259 |00:00:00.01 | 719 | | | | | 4 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | | | 5 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | | | 6 | TABLE ACCESS FULL | UET$ | 1 | 1 | 0 |00:00:00.01 | 310 | | | | |* 7 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 8 | VIEW | SYS_DBA_SEGS | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 9 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | | | | | 10 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 11 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 12 | MERGE JOIN CARTESIAN | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 13 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 14 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 15 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 16 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 17 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 18 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 20 | BUFFER SORT | | 0 | 2 | 0 |00:00:00.01 | 0 | 73728 | 73728 | | |* 21 | INDEX SKIP SCAN | I_OBJ2 | 0 | 2 | 0 |00:00:00.01 | 0 | | | | | 22 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 23 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 24 | VIEW | SYS_OBJECTS | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 25 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | | | | |* 26 | TABLE ACCESS CLUSTER | TAB$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 27 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 28 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 29 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 30 | TABLE ACCESS CLUSTER | CLU$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 31 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 32 | TABLE ACCESS BY INDEX ROWID | IND$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 33 | INDEX UNIQUE SCAN | I_IND1 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 34 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 35 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 36 | TABLE ACCESS BY INDEX ROWID | LOB$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 37 | INDEX UNIQUE SCAN | I_LOB2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 38 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 39 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 40 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 41 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 42 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 43 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 44 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 45 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 46 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 47 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 48 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 49 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 50 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 51 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 52 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 53 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 54 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 55 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 56 | INDEX RANGE SCAN | I_UNDO2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 57 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 58 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 59 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 60 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 61 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 62 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 63 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 64 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 65 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 66 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 67 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 68 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |* 69 | HASH JOIN | | 1 | 728 | 259 |00:00:00.01 | 409 | 1969K| 1969K| 1497K (0)| | 70 | INDEX FULL SCAN | I_FILE2 | 1 | 106 | 108 |00:00:00.01 | 1 | | | | | 71 | NESTED LOOPS | | 1 | 24769 | 259 |00:00:00.01 | 408 | | | | | 72 | VIEW | SYS_DBA_SEGS | 1 | 3 | 1 |00:00:00.01 | 401 | | | | | 73 | UNION-ALL | | 1 | | 1 |00:00:00.01 | 401 | | | | | 74 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 89 | | | | | 75 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 87 | | | | | 76 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 86 | | | | | 77 | NESTED LOOPS OUTER | | 1 | 1 | 1 |00:00:00.01 | 83 | | | | | 78 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 81 | | | | |* 79 | INDEX SKIP SCAN | I_OBJ2 | 1 | 2 | 1 |00:00:00.01 | 65 | | | | |* 80 | VIEW | SYS_OBJECTS | 1 | 1 | 1 |00:00:00.01 | 16 | | | | | 81 | UNION ALL PUSHED PREDICATE | | 1 | | 1 |00:00:00.01 | 16 | | | | |* 82 | TABLE ACCESS CLUSTER | TAB$ | 1 | 1 | 1 |00:00:00.01 | 3 | | | | |* 83 | INDEX UNIQUE SCAN | I_OBJ# | 1 | 1 | 1 |00:00:00.01 | 2 | | | | | 84 | TABLE ACCESS BY INDEX ROWID| TABPART$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | | |* 85 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | | | 86 | TABLE ACCESS CLUSTER | CLU$ | 1 | 1 | 0 |00:00:00.01 | 3 | | | | |* 87 | INDEX UNIQUE SCAN | I_OBJ# | 1 | 1 | 1 |00:00:00.01 | 2 | | | | |* 88 | TABLE ACCESS BY INDEX ROWID| IND$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | | |* 89 | INDEX UNIQUE SCAN | I_IND1 | 1 | 1 | 0 |00:00:00.01 | 2 | | | | | 90 | TABLE ACCESS BY INDEX ROWID| INDPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | |* 91 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | |* 92 | TABLE ACCESS BY INDEX ROWID| LOB$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | | |* 93 | INDEX UNIQUE SCAN | I_LOB2 | 1 | 1 | 0 |00:00:00.01 | 2 | | | | | 94 | TABLE ACCESS BY INDEX ROWID| TABSUBPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | |* 95 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | | 96 | TABLE ACCESS BY INDEX ROWID| INDSUBPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | |* 97 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | | 98 | TABLE ACCESS BY INDEX ROWID| LOBFRAG$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | |* 99 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | | | 100 | TABLE ACCESS CLUSTER | USER$ | 1 | 1 | 1 |00:00:00.01 | 2 | | | | |*101 | INDEX UNIQUE SCAN | I_USER# | 1 | 1 | 1 |00:00:00.01 | 1 | | | | |*102 | TABLE ACCESS CLUSTER | SEG$ | 1 | 1 | 1 |00:00:00.01 | 3 | | | | |*103 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 1 | 1 | 1 |00:00:00.01 | 2 | | | | |*104 | INDEX UNIQUE SCAN | I_FILE2 | 1 | 1 | 1 |00:00:00.01 | 1 | | | | | 105 | TABLE ACCESS CLUSTER | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | | | | |*106 | INDEX UNIQUE SCAN | I_TS# | 1 | 1 | 1 |00:00:00.01 | 1 | | | | | 107 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 2 | | | | | 108 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | | | 109 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | | | 110 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | | |*111 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | | |*112 | INDEX RANGE SCAN | I_UNDO2 | 1 | 1 | 0 |00:00:00.01 | 2 | | | | |*113 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*114 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*115 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 116 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*117 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 118 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*119 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 120 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | | | 121 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | | | 122 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 310 | | | | | 123 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | | |*124 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 0 |00:00:00.01 | 310 | | | | | 125 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*126 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | | 127 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*128 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*129 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*130 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | | |*131 | FIXED TABLE FIXED INDEX | X$KTFBUE (ind:1) | 1 | 8256 | 259 |00:00:00.01 | 7 | | | | ------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id): --------------------------------------------------- 7 - access("E"."TS#"="F"."TS#" AND "E"."FILE#"="F"."RELFILE#") 15 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#") 17 - access("TS"."TS#"="E"."TS#") 18 - filter((BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0)) 19 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#") filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")) 21 - access("O"."NAME"='AUD$') filter("O"."NAME"='AUD$') 23 - access("O"."OWNER#"="U"."USER#") 24 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND "S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID")) 26 - filter(("T"."BLOCK#"="E"."SEGBLOCK#" AND "T"."FILE#"="E"."SEGFILE#" AND "T"."TS#"="E"."TS#" AND BITAND("T"."PROPERTY",1024)=0)) 27 - access("T"."OBJ#"="O"."OBJ#") 28 - filter(("TP"."BLOCK#"="E"."SEGBLOCK#" AND "TP"."FILE#"="E"."SEGFILE#" AND "TP"."TS#"="E"."TS#")) 29 - access("TP"."OBJ#"="O"."OBJ#") 30 - filter(("C"."BLOCK#"="E"."SEGBLOCK#" AND "C"."FILE#"="E"."SEGFILE#" AND "C"."TS#"="E"."TS#")) 31 - access("C"."OBJ#"="O"."OBJ#") 32 - filter(("I"."BLOCK#"="E"."SEGBLOCK#" AND "I"."FILE#"="E"."SEGFILE#" AND "I"."TS#"="E"."TS#" AND INTERNAL_FUNCTION("I"."TYPE#"))) 33 - access("I"."OBJ#"="O"."OBJ#") 34 - filter(("IP"."BLOCK#"="E"."SEGBLOCK#" AND "IP"."FILE#"="E"."SEGFILE#" AND "IP"."TS#"="E"."TS#")) 35 - access("IP"."OBJ#"="O"."OBJ#") 36 - filter(("L"."BLOCK#"="E"."SEGBLOCK#" AND "L"."FILE#"="E"."SEGFILE#" AND "L"."TS#"="E"."TS#" AND (BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128))) 37 - access("L"."LOBJ#"="O"."OBJ#") 38 - filter(("TSP"."BLOCK#"="E"."SEGBLOCK#" AND "TSP"."FILE#"="E"."SEGFILE#" AND "TSP"."TS#"="E"."TS#")) 39 - access("TSP"."OBJ#"="O"."OBJ#") 40 - filter(("ISP"."FILE#"="E"."SEGFILE#" AND "ISP"."BLOCK#"="E"."SEGBLOCK#" AND "ISP"."TS#"="E"."TS#")) 41 - access("ISP"."OBJ#"="O"."OBJ#") 42 - filter(("LF"."BLOCK#"="E"."SEGBLOCK#" AND "LF"."FILE#"="E"."SEGFILE#" AND "LF"."TS#"="E"."TS#")) 43 - access("LF"."FRAGOBJ#"="O"."OBJ#") 49 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#") 51 - access("TS"."TS#"="E"."TS#") 52 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0)) 53 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#") filter("S"."TS#"="TS"."TS#") 55 - access("S"."USER#"="U"."USER#") 56 - access("UN"."NAME"='AUD$') 57 - filter(("UN"."BLOCK#"="E"."SEGBLOCK#" AND "UN"."FILE#"="E"."SEGFILE#" AND "UN"."TS#"="E"."TS#" AND "UN"."STATUS$"<>1 AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#" AND "S"."TS#"="UN"."TS#" AND "UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#")) 62 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#") 64 - access("TS"."TS#"="E"."TS#") 65 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1)) 66 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#") filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#" AND TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$')) 68 - access("S"."USER#"="U"."USER#") 69 - access("DS"."TABLESPACE_ID"="F"."TS#" AND "E"."KTFBUEFNO"="F"."RELFILE#") 79 - access("O"."NAME"='AUD$') filter("O"."NAME"='AUD$') 80 - filter("O"."TYPE#"="SO"."OBJECT_TYPE_ID") 82 - filter(BITAND("T"."PROPERTY",1024)=0) 83 - access("T"."OBJ#"="O"."OBJ#") 85 - access("TP"."OBJ#"="O"."OBJ#") 87 - access("C"."OBJ#"="O"."OBJ#") 88 - filter(("I"."TYPE#"=1 OR "I"."TYPE#"=2 OR "I"."TYPE#"=3 OR "I"."TYPE#"=4 OR "I"."TYPE#"=6 OR "I"."TYPE#"=7 OR "I"."TYPE#"=8 OR "I"."TYPE#"=9)) 89 - access("I"."OBJ#"="O"."OBJ#") 91 - access("IP"."OBJ#"="O"."OBJ#") 92 - filter((BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128)) 93 - access("L"."LOBJ#"="O"."OBJ#") 95 - access("TSP"."OBJ#"="O"."OBJ#") 97 - access("ISP"."OBJ#"="O"."OBJ#") 99 - access("LF"."FRAGOBJ#"="O"."OBJ#") 101 - access("O"."OWNER#"="U"."USER#") 102 - filter((BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"="SO"."SEGMENT_TYPE_ID")) 103 - access("S"."TS#"="SO"."TS_NUMBER" AND "S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK") 104 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#") 106 - access("S"."TS#"="TS"."TS#") 111 - filter("UN"."STATUS$"<>1) 112 - access("UN"."NAME"='AUD$') 113 - access("UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#") 114 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0)) 115 - access("S"."TS#"="UN"."TS#" AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#") 117 - access("S"."TS#"="TS"."TS#") 119 - access("S"."USER#"="U"."USER#") 124 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1)) 126 - access("S"."TS#"="TS"."TS#") 128 - access("S"."USER#"="U"."USER#") 129 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#") 130 - filter(TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$') 131 - filter(("E"."KTFBUESEGFNO"="DS"."RELATIVE_FNO" AND "E"."KTFBUESEGBNO"="DS"."HEADER_BLOCK" AND "E"."KTFBUESEGTSN"="DS"."TABLESPACE_ID")) 231 rows selected. Elapsed: 00:00:00.15
在查询表空间的时候，执行alter session set "_FIX_CONTROL" = "11814428:0";后，X$KTFBUE还是走全表扫描：
（表空间名字做处理）
20:32:05 SYS@eportdbi1> SELECT a.tablespace_name, 20:32:05 2 ROUND (a.bytes_alloc / 1024 / 1024, 2) megs_alloc, 20:32:05 3 ROUND (NVL (b.bytes_free, 0) / 1024 / 1024, 2) megs_free, 20:32:05 4 ROUND ((a.bytes_alloc - NVL (b.bytes_free, 0)) / 1024 / 1024, 2 ) megs_used, 20:32:05 5 ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_free, 20:32:05 6 100 - ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_used, 20:32:05 7 ROUND (maxbytes / 1048576, 2) MAX 20:32:05 8 FROM 20:32:05 9 (SELECT f.tablespace_name, 20:32:05 10 SUM (f.BYTES) bytes_alloc, 20:32:05 11 SUM (DECODE (f.autoextensible, 'YES', f.maxbytes, 'NO', f.BYTES ) ) maxbytes 20:32:05 12 FROM dba_data_files f 20:32:05 13 GROUP BY tablespace_name 20:32:05 14 ) a, 20:32:05 15 (SELECT f.tablespace_name, 20:32:05 16 SUM (f.BYTES) bytes_free 20:32:05 17 FROM dba_free_space f 20:32:05 18 GROUP BY tablespace_name 20:32:05 19 ) b 20:32:05 20 WHERE a.tablespace_name = b.tablespace_name(+) 20:32:05 21 UNION ALL 20:32:05 22 SELECT h.tablespace_name, 20:32:05 23 ROUND (SUM (h.bytes_free + h.bytes_used) / 1048576, 2) megs_alloc, 20:32:05 24 ROUND ( SUM ((h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0)) / 1048576, 2 ) megs_free, 20:32:05 25 ROUND (SUM (NVL (p.bytes_used, 0)) / 1048576, 2) megs_used, 20:32:05 26 ROUND ( ( SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0) ) / SUM (h.bytes_used + h.bytes_free) ) * 100, 2 ) pct_free, 20:32:05 27 100 - ROUND ( ( SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0) ) / SUM (h.bytes_used + h.bytes_free) ) * 100, 2 ) pct_used, 20:32:05 28 ROUND (SUM (f.maxbytes) / 1048576, 2) MAX 20:32:05 29 FROM SYS.v_$temp_space_header h, 20:32:05 30 SYS.v_$temp_extent_pool p, 20:32:05 31 dba_temp_files f 20:32:05 32 WHERE p.file_id(+) = h.file_id 20:32:06 33 AND p.tablespace_name(+) = h.tablespace_name 20:32:06 34 AND f.file_id = h.file_id 20:32:06 35 AND f.tablespace_name = h.tablespace_name 20:32:06 36 GROUP BY h.tablespace_name 20:32:06 37 ORDER BY 1 ; TABLESPACE_NAME MEGS_ALLOC MEGS_FREE MEGS_USED PCT_FREE PCT_USED MAX ------------------------------ ---------- ---------- ---------- ---------- ---------- ---------- xxxxxxxxxxxxxxxx 4096 4019 77 98.12 1.88 4096 xxxxxxxxxxxxxxxx 8192 2283 5909 27.87 72.13 8192 xxxxxxxxxxxxxxxx 2048 1113 935 54.35 45.65 2048 xxxxxxxxxxxxxxxx 24576 16092 8484 65.48 34.52 24576 xxxxxxxxxxxxxxxx 4096 4095 1 99.98 .02 4096 xxxxxxxxxxxxxxxx 8192 8187 5 99.94 .06 8192 xxxxxxxxxxxxxxxx 4000 3373 627 84.33 15.67 4000 xxxxxxxxxxxxxxxx 546304 346561 199743 63.44 36.56 546304 xxxxxxxxxxxxxxxx 4096 2969 1127 72.49 27.51 4096 xxxxxxxxxxxxxxxx 4096 4086 10 99.76 .24 4096 xxxxxxxxxxxxxxxx 8192 3047 5145 37.19 62.81 8192 xxxxxxxxxxxxxxxx 276608 77078 199530 27.87 72.13 276608 xxxxxxxxxxxxxxxx 16384 8605 7779 52.52 47.48 16384 xxxxxxxxxxxxxxxx 4096 2944 1152 71.88 28.12 4096 xxxxxxxxxxxxxxxx 16384 3575 12809 21.82 78.18 16384 xxxxxxxxxxxxxxxx 4096 1074 3022 26.22 73.78 4096 xxxxxxxxxxxxxxxx 4096 4071 25 99.39 .61 4096 xxxxxxxxxxxxxxxx 4096 3915 181 95.58 4.42 4096 xxxxxxxxxxxxxxxx 16384 15984 400 97.56 2.44 16384 xxxxxxxxxxxxxxxx 32760 8390.88 24369.13 25.61 74.39 32767.98 xxxxxxxxxxxxxxxx 5360 34.13 5325.88 .64 99.36 32767.98 xxxxxxxxxxxxxxxx 4096 2946 1150 71.92 28.08 4096 xxxxxxxxxxxxxxxx 4096 4052 44 98.93 1.07 4096 xxxxxxxxxxxxxxxx 20096 13860 6236 68.97 31.03 20096 xxxxxxxxxxxxxxxx 16384 13068 3316 79.76 20.24 16384 xxxxxxxxxxxxxxxx 208192 40933 167259 19.66 80.34 208192 xxxxxxxxxxxxxxxx 20096 16143 3953 80.33 19.67 20096 xxxxxxxxxxxxxxxx 2048 1898 150 92.68 7.32 2048 xxxxxxxxxxxxxxxx 20096 16138 3958 80.3 19.7 20096 xxxxxxxxxxxxxxxx 68096 13300 54796 19.53 80.47 68096 xxxxxxxxxxxxxxxx 8192 8179 13 99.84 .16 8192 xxxxxxxxxxxxxxxx 32767 31971 796 97.57 2.43 32767.98 xxxxxxxxxxxxxxxx 10240 2371.75 7868.25 23.16 76.84 10240 xxxxxxxxxxxxxxxx 10390 9292.25 1097.75 89.43 10.57 32767.98 xxxxxxxxxxxxxxxx 4356.25 209.38 4146.88 4.81 95.19 32767.98 35 rows selected. Elapsed: 00:01:54.62
执行计划：
20:34:00 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ SQL_ID 8ks58zbpgra00, child number 1 ------------------------------------- SELECT a.tablespace_name, ROUND (a.bytes_alloc / 1024 / 1024, 2) megs_alloc, ROUND (NVL (b.bytes_free, 0) / 1024 / 1024, 2) megs_free, ROUND ((a.bytes_alloc - NVL (b.bytes_free, 0)) / 1024 / 1024, 2 ) megs_used, ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_free, 100 - ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_used, ROUND (maxbytes / 1048576, 2) MAX FROM (SELECT f.tablespace_name, SUM (f.BYTES) bytes_alloc, SUM (DECODE (f.autoextensible, 'YES', f.maxbytes, 'NO', f.BYTES ) ) maxbytes FROM dba_data_files f GROUP BY tablespace_name ) a, (SELECT f.tablespace_name, SUM (f.BYTES) bytes_free FROM dba_free_space f GROUP BY tablespace_name ) b WHERE a.tablespace_name = b.tablespace_name(+) UNION ALL SELECT h.tablespace_name, ROUND (SUM (h.bytes_free + h.bytes_used) / 1048576, 2) megs_alloc, ROUND ( SUM ((h.bytes_free + h.bytes_used) - NVL (p.b Plan hash value: 2506036241 ------------------------------------------------------------------------------------------------------------------------------------------------------------ | Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem | ------------------------------------------------------------------------------------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 1 | | 35 |00:01:54.53 | 53354 | 4865 | | | | | 1 | SORT ORDER BY | | 1 | 3 | 35 |00:01:54.53 | 53354 | 4865 | 4096 | 4096 | 4096 (0)| | 2 | UNION-ALL | | 1 | | 35 |00:01:54.53 | 53354 | 4865 | | | | |* 3 | HASH JOIN OUTER | | 1 | 2 | 34 |00:01:54.18 | 53310 | 4865 | 1229K| 1229K| 1243K (0)| | 4 | VIEW | | 1 | 2 | 34 |00:00:00.66 | 444 | 0 | | | | | 5 | HASH GROUP BY | | 1 | 2 | 34 |00:00:00.66 | 444 | 0 | 941K| 941K| 1349K (0)| | 6 | VIEW | DBA_DATA_FILES | 1 | 2 | 108 |00:00:00.65 | 444 | 0 | | | | | 7 | UNION-ALL | | 1 | | 108 |00:00:00.65 | 444 | 0 | | | | | 8 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | | | 9 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | | | 10 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | | |* 11 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 108 |00:00:00.57 | 0 | 0 | | | | |* 12 | TABLE ACCESS BY INDEX ROWID| FILE$ | 108 | 1 | 0 |00:00:00.01 | 112 | 0 | | | | |* 13 | INDEX UNIQUE SCAN | I_FILE1 | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | | |* 14 | FIXED TABLE FIXED INDEX | X$KCCFE (ind:1) | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 15 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 16 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 17 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.08 | 332 | 0 | | | | | 18 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.08 | 220 | 0 | | | | | 19 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.01 | 220 | 0 | | | | | 20 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.01 | 108 | 0 | | | | |* 21 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 108 |00:00:00.01 | 0 | 0 | | | | |* 22 | FIXED TABLE FIXED INDEX | X$KTFBHC (ind:1) | 108 | 1 | 108 |00:00:00.01 | 108 | 0 | | | | |* 23 | TABLE ACCESS BY INDEX ROWID| FILE$ | 108 | 1 | 108 |00:00:00.01 | 112 | 0 | | | | |* 24 | INDEX UNIQUE SCAN | I_FILE1 | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | | |* 25 | FIXED TABLE FIXED INDEX | X$KCCFE (ind:1) | 108 | 1 | 108 |00:00:00.08 | 0 | 0 | | | | | 26 | TABLE ACCESS CLUSTER | TS$ | 108 | 1 | 108 |00:00:00.01 | 112 | 0 | | | | |* 27 | INDEX UNIQUE SCAN | I_TS# | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | | | 28 | VIEW | | 1 | 31 | 34 |00:01:53.52 | 52866 | 4865 | | | | | 29 | HASH GROUP BY | | 1 | 31 | 34 |00:01:53.52 | 52866 | 4865 | 9291K| 2834K| 1346K (0)| | 30 | VIEW | DBA_FREE_SPACE | 1 | 140 | 100K|00:01:53.50 | 52866 | 4865 | | | | | 31 | UNION-ALL | | 1 | | 100K|00:01:53.48 | 52866 | 4865 | | | | | 32 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | | | 33 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | | | 34 | TABLE ACCESS FULL | FET$ | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | | |* 35 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 36 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 37 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 38 | NESTED LOOPS | | 1 | 88 | 84440 |00:00:00.15 | 394 | 0 | | | | | 39 | NESTED LOOPS | | 1 | 88 | 84440 |00:00:00.06 | 390 | 0 | | | | |* 40 | TABLE ACCESS FULL | TS$ | 1 | 31 | 34 |00:00:00.01 | 38 | 0 | | | | |* 41 | FIXED TABLE FIXED INDEX | X$KTFBFE (ind:1) | 34 | 3 | 84440 |00:00:00.05 | 352 | 0 | | | | |* 42 | INDEX UNIQUE SCAN | I_FILE2 | 84440 | 1 | 84440 |00:00:00.06 | 4 | 0 | | | | |* 43 | HASH JOIN | | 1 | 50 | 16133 |00:01:53.30 | 52396 | 4865 | 2297K| 2297K| 2426K (0)| | 44 | NESTED LOOPS | | 1 | 50 | 16133 |00:01:53.29 | 52358 | 4865 | | | | |* 45 | HASH JOIN | | 1 | 808 | 16133 |00:01:53.26 | 52354 | 4865 | 1753K| 1753K| 1511K (0)| |* 46 | TABLE ACCESS FULL | RECYCLEBIN$ | 1 | 152 | 191 |00:00:00.01 | 4 | 0 | | | | | 47 | FIXED TABLE FULL | X$KTFBUE | 1 | 100K| 723K|00:01:52.95 | 52350 | 4865 | | | | |* 48 | INDEX UNIQUE SCAN | I_FILE2 | 16133 | 1 | 16133 |00:00:00.01 | 4 | 0 | | | | |* 49 | TABLE ACCESS FULL | TS$ | 1 | 31 | 34 |00:00:00.01 | 38 | 0 | | | | | 50 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | | | 51 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | | | 52 | MERGE JOIN CARTESIAN | | 1 | 425 | 0 |00:00:00.01 | 38 | 0 | | | | |* 53 | TABLE ACCESS FULL | TS$ | 1 | 3 | 0 |00:00:00.01 | 38 | 0 | | | | | 54 | BUFFER SORT | | 0 | 152 | 0 |00:00:00.01 | 0 | 0 | 73728 | 73728 | | |* 55 | TABLE ACCESS FULL | RECYCLEBIN$ | 0 | 152 | 0 |00:00:00.01 | 0 | 0 | | | | | 56 | TABLE ACCESS CLUSTER | UET$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 57 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | |* 58 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | | | 59 | HASH GROUP BY | | 1 | 1 | 1 |00:00:00.35 | 44 | 0 | 856K| 856K| 463K (0)| | 60 | NESTED LOOPS OUTER | | 1 | 1 | 1 |00:00:00.35 | 44 | 0 | | | | |* 61 | HASH JOIN | | 1 | 1 | 1 |00:00:00.35 | 42 | 0 | 1281K| 1281K| 402K (0)| | 62 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 3 | 0 | | | | | 63 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 1 | 0 | | | | | 64 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 0 | 0 | | | | |* 65 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 1 |00:00:00.34 | 0 | 0 | | | | |* 66 | FIXED TABLE FIXED INDEX | X$KCCTF (ind:1) | 1 | 1 | 1 |00:00:00.01 | 0 | 0 | | | | |* 67 | FIXED TABLE FIXED INDEX | X$KTFTHC (ind:1) | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | | | 68 | TABLE ACCESS CLUSTER | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | | |* 69 | INDEX UNIQUE SCAN | I_TS# | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | | | 70 | VIEW | V_$TEMP_SPACE_HEADER | 1 | 1 | 1 |00:00:00.01 | 39 | 0 | | | | | 71 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 39 | 0 | | | | |* 72 | TABLE ACCESS FULL | TS$ | 1 | 1 | 1 |00:00:00.01 | 38 | 0 | | | | |* 73 | FIXED TABLE FIXED INDEX | X$KTFTHC (ind:2) | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | | |* 74 | VIEW PUSHED PREDICATE | V_$TEMP_EXTENT_POOL | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | | | 75 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | | |* 76 | TABLE ACCESS BY INDEX ROWID | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | | |* 77 | INDEX UNIQUE SCAN | I_TS1 | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | | |* 78 | FIXED TABLE FIXED INDEX | X$KTSTFC (ind:1) | 1 | 1 | 1 |00:00:00.01 | 0 | 0 | | | | ------------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id): --------------------------------------------------- 3 - access("A"."TABLESPACE_NAME"="B"."TABLESPACE_NAME") 11 - filter(("FNNAM" IS NOT NULL AND "FNTYP"=4 AND "INST_ID"=USERENV('INSTANCE') AND BITAND("FNFLG",4)<>4)) 12 - filter("F"."SPARE1" IS NULL) 13 - access("FNFNO"="F"."FILE#") 14 - filter("FE"."FENUM"="F"."FILE#") 16 - access("F"."TS#"="TS"."TS#") 21 - filter(("FNNAM" IS NOT NULL AND "FNTYP"=4 AND "INST_ID"=USERENV('INSTANCE') AND BITAND("FNFLG",4)<>4)) 22 - filter("FNFNO"="HC"."KTFBHCAFNO") 23 - filter("F"."SPARE1" IS NOT NULL) 24 - access("FNFNO"="F"."FILE#") 25 - filter("FE"."FENUM"="F"."FILE#") 27 - access("HC"."KTFBHCTSN"="TS"."TS#") 35 - filter("TS"."BITMAPPED"=0) 36 - access("TS"."TS#"="F"."TS#") 37 - access("F"."TS#"="FI"."TS#" AND "F"."FILE#"="FI"."RELFILE#") 40 - filter(("TS"."BITMAPPED"<>0 AND "TS"."CONTENTS$"=0 AND INTERNAL_FUNCTION("TS"."ONLINE$"))) 41 - filter("TS"."TS#"="F"."KTFBFETSN") 42 - access("F"."KTFBFETSN"="FI"."TS#" AND "F"."KTFBFEFNO"="FI"."RELFILE#") 43 - access("TS"."TS#"="RB"."TS#") 45 - access("U"."KTFBUESEGTSN"="RB"."TS#" AND "U"."KTFBUESEGFNO"="RB"."FILE#" AND "U"."KTFBUESEGBNO"="RB"."BLOCK#") 46 - filter(("RB"."TS#" IS NOT NULL AND "RB"."FILE#" IS NOT NULL AND "RB"."BLOCK#" IS NOT NULL)) 48 - access("RB"."TS#"="FI"."TS#" AND "U"."KTFBUEFNO"="FI"."RELFILE#") 49 - filter(("TS"."BITMAPPED"<>0 AND "TS"."CONTENTS$"=0 AND INTERNAL_FUNCTION("TS"."ONLINE$"))) 53 - filter("TS"."BITMAPPED"=0) 55 - filter(("RB"."TS#" IS NOT NULL AND "RB"."FILE#" IS NOT NULL AND "RB"."BLOCK#" IS NOT NULL)) 57 - access("U"."TS#"="RB"."TS#" AND "U"."SEGFILE#"="RB"."FILE#" AND "U"."SEGBLOCK#"="RB"."BLOCK#") filter("TS"."TS#"="U"."TS#") 58 - access("U"."TS#"="FI"."TS#" AND "U"."SEGFILE#"="FI"."RELFILE#") 61 - access("HC"."KTFTHCTFNO"="H"."FILE_ID" AND "TS"."NAME"="H"."TABLESPACE_NAME") 65 - filter(("V"."FNNAM" IS NOT NULL AND "V"."FNTYP"=7)) 66 - filter(("TF"."TFDUP"<>0 AND BITAND("TF"."TFSTA",32)<>32 AND "V"."FNFNO"="TF"."TFNUM" AND "TF"."TFFNH"="V"."FNNUM")) 67 - filter("V"."FNFNO"="HC"."KTFTHCTFNO") 69 - access("HC"."KTFTHCTSN"="TS"."TS#") 72 - filter(("TS"."CONTENTS$"=1 AND "TS"."BITMAPPED"<>0 AND "TS"."ONLINE$"=1)) 73 - filter(("HC"."KTFTHCCVAL"=0 AND "HC"."INST_ID"=USERENV('INSTANCE') AND "TS"."TS#"="HC"."KTFTHCTSN")) 74 - filter("P"."FILE_ID"="H"."FILE_ID") 76 - filter(("TS"."CONTENTS$"=1 AND "TS"."BITMAPPED"<>0 AND "TS"."ONLINE$"=1)) 77 - access("TS"."NAME"="H"."TABLESPACE_NAME") 78 - filter(("FC"."INST_ID"=USERENV('INSTANCE') AND "TS"."TS#"="FC"."KTSTFCTSN")) 147 rows selected. Elapsed: 00:00:00.08
解决可以看我另外一篇博文：Oracle查询表空间使用率很慢
