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摘要: Oracle Database Memory ParametersProgram Global Area(PGA)Automatic PGA memory management is enabled by default.Using the V$PARAMETER ViewSQL> show parameter sga_target;NAME TYPE VALUE------------------------------------ ----------- -----------------------------... 阅读全文
posted @ 2013-05-28 11:03 ArcerZhang 阅读(334) 评论(0) 推荐(0) 编辑
摘要: 参考文章:http://www.ningoo.net/html/2007/oracle11g_new_feature_flashback_data_archive2.html一.后台进程Oracle11g为Flashback data archive特性专门引入了一个新的后台进程FBDA,用于将追踪表(traced table,也就是将指定使用flashback data archive的table)的历史变化数据转存到闪回归档区。NING@11g>select name,description from v$bgprocess where name=’FBDA’;NAME DESCRI 阅读全文
posted @ 2013-05-28 09:10 ArcerZhang 阅读(250) 评论(0) 推荐(0) 编辑
摘要: SQL> drop table t;drop table t *ERROR at line 1:ORA-55610: Invalid DDL statement on history-tracked table情况分析置于Flashback data archive中的table的一些限制追踪表(Tracked table),也就是指定将历史数据保存到某个flashback data archive中的table,不能执行DDL操作(add column除外)。NING@11g>drop table test;drop table test*ERROR at line 1:... 阅读全文
posted @ 2013-05-28 09:04 ArcerZhang 阅读(1129) 评论(0) 推荐(0) 编辑
摘要: C:\Users\MaryHu>exp ARCER/ARCER@DB234 FILE=E:\FGPS_20130528.dmp statistics=noneExport: Release 11.2.0.1.0 - Production on Tue May 28 08:04:54 2013Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 6 阅读全文
posted @ 2013-05-28 08:10 ArcerZhang 阅读(2367) 评论(0) 推荐(0) 编辑
摘要: placeholder 阅读全文
posted @ 2013-05-27 19:18 ArcerZhang 阅读(118) 评论(0) 推荐(0) 编辑
摘要: Java Pool and Streams PoolJava pool memory is used in server memory for all session-specific Java code and data in the JVM.Streams pool memory is used exclusively by Oracle Streams to:Store buffered queue messagesProvide memory for Oracle Streams processesRedo Log BufferIs a circular buffer in the S 阅读全文
posted @ 2013-05-27 18:51 ArcerZhang 阅读(125) 评论(0) 推荐(0) 编辑
摘要: shared server模式下,UGA放在SGA的哪个位置?如果配置了LARGE POOL,UGA就会放在LARGE POOL中;否则如果没有配置,那么就存放在SHARED POOL当中.oracle 11g以后,可以将sql,pl/sql的执行结果存放在result pool中.Shared PoolContents:Library cache:Command text,parsed code,and execution planData dictionary cache:Definitions for tables,columns,and privileges from the data 阅读全文
posted @ 2013-05-27 17:55 ArcerZhang 阅读(193) 评论(0) 推荐(0) 编辑
摘要: 在一个Data Buffer Cache中,有可能存在一个数据块的多个副本.Dirty是指,被修改过的、还没有被flush到磁盘中去的数据状态.Buffer Cache数据在Buffer Cache中的四种状态值PinnedCleanFree/unusedDirtyUsing Multiple Buffer Poolsstep: =>创建Buffer Pool =>使用Buffer Pool 1、在创建对象时指定Buffer Pool CREATE INDEX cust_idx ... STORAGE(BUFFER_POOL KEEP); 2、修改表所在的BUF... 阅读全文
posted @ 2013-05-27 16:24 ArcerZhang 阅读(157) 评论(0) 推荐(0) 编辑
摘要: ObjectivesAfter completing this lesson,you should be able to :Describe the memory components in the SGAImplement Automatic Memory ManagementManually configure SGA parametersConfigure automatic PGA memory managementMemory Management:OverviewDBAs must consider memory managment to be a crucial part of 阅读全文
posted @ 2013-05-27 15:42 ArcerZhang 阅读(132) 评论(0) 推荐(0) 编辑
摘要: Restoring Tables from the Recycle BinRestore dropped tables and dependent objects.If multiple recyclye bin entries have the same original name:Use qunique,system-generated names to restore a particular version.When using original names,the restored table is last in,first out(LIFO)Rename the original 阅读全文
posted @ 2013-05-27 11:09 ArcerZhang 阅读(279) 评论(0) 推荐(0) 编辑
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