Oracle ADG备库新增变为一主多从
新增备库主机：
192.168.66.44
主机名：dgd
sid：orcl
网络别名：orcl_sd
1，更改现在的主备文件
hosts文件，tnsnames.ora文件，initorcl.ora文件
1.1，更改hosts文件
把新增的主机加上
主：
[oracle@db dbs]$ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.66.61 db 192.168.66.62 dg 192.168.66.64 dgd
备1：
[oracle@dg dbs]$ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.66.61 db 192.168.66.62 dg 192.168.66.64 dgd
备2：
[oracle@dgd ~]$ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.66.61 db 192.168.66.62 dg 192.168.66.64 dgd
1.2,修改tnsnames.ora文件
主：
#增加下面内容 [oracle@db admin]$ vim tnsnames.ora orcl_sd = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = dgd)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) (SERVER = DEDICATED) ) )
备1：
#增加下面内容 [oracle@dg admin]$ vim tnsnames.ora orcl_sd = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = dgd)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) (SERVER = DEDICATED) ) )
备3：
[oracle@dgd admin]$ cat tnsnames.ora # tnsnames.ora Network Configuration File: /data/app/oracle/product/11.2.0.4/db_1/network/admin/tnsnames.ora # Generated by Oracle configuration tools. ORCL = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = dgd)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl) ) ) orcl_pri = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = db)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) (SERVER = DEDICATED) ) ) orcl_sty = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = dg)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) (SERVER = DEDICATED) ) ) orcl_sd = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = dgd)(PORT = 1521)) ) (CONNECT_DATA = (SERVICE_NAME = orcl) (SERVER = DEDICATED) ) )
1.3，修改pfile文件
主：
#修改和增加了以下内容 [oracle@db dbs]$ pwd /data/app/oracle/product/11.2.0.4/db_1/dbs [oracle@db dbs]$ vim initorcl.ora *.log_archive_config='dg_config=(orcl_pri,orcl_sty,orcl_sd)' *.log_archive_dest_3='service=orcl_sd LGWR ASYNC valid_for=(online_logfiles,primary_role) db_unique_name=orcl_sd' *.log_archive_dest_state_3='ENABLE' *.fal_server='orcl_sty,orcl_sd' *.db_file_name_convert='/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/' *.log_file_name_convert='/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/'
备1：
#修改和增加了以下内容 [oracle@dg dbs]$ pwd /data/app/oracle/product/11.2.0.4/db_1/dbs [oracle@dg dbs]$ vim initorcl_sty.ora *.fal_server='orcl_pri,orcl_sd' *.log_archive_config='dg_config=(orcl_pri,orcl_sty,orcl_sd)' *.log_archive_dest_3='service=orcl_sd LGWR ASYNC valid_for=(online_logfiles,primary_role) db_unique_name=orcl_sd' *.log_archive_dest_state_3='ENABLE' *.log_file_name_convert='/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/' *.db_file_name_convert='/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/'
备2：
#可以把备1的pfile文件传到备2上然后进行修改 备1： [oracle@dg dbs]$ scp initorcl_sty.ora oracle@dgd:$ORACLE_HOME/dbs/ 备2： [oracle@dgd dbs]$ mv initorcl_sty.ora initorcl_sd.ora [oracle@dgd dbs]$ cat initorcl_sd.ora orcl_sd.__db_cache_size=5586812928 orcl_sd.__java_pool_size=33554432 orcl_sd.__large_pool_size=603979776 orcl_sd.__oracle_base='/data/app/oracle' orcl_sd.__pga_aggregate_target=2466250752 orcl_sd.__sga_target=7381975040 orcl_sd.__shared_io_pool_size=0 orcl_sd.__shared_pool_size=1107296256 orcl_sd.__streams_pool_size=0 *.audit_file_dest='/data/app/oracle/admin/orcl/adump' *.audit_trail='db' *.compatible='11.2.0.4.0' *.control_files='/data/app/oracle/oradata/orcl/control01.ctl','/data/app/oracle/fast_recovery_area/orcl/control02.ctl' *.db_block_size=8192 *.db_domain='' *.db_file_name_convert='/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/' *.db_files=2000 *.db_name='orcl' *.db_recovery_file_dest='/data/app/oracle/fast_recovery_area' *.db_recovery_file_dest_size=53687091200 *.db_unique_name='orcl_sd' *.diagnostic_dest='/data/app/oracle' *.dispatchers='(PROTOCOL=TCP) (SERVICE=orclXDB)' *.fal_client='orcl_sd' *.fal_server='orcl_pri,orcl_sty' *.log_archive_config='dg_config=(orcl_pri,orcl_sty,orcl_sd)' *.log_archive_dest_1='LOCATION=USE_DB_RECOVERY_FILE_DEST valid_for=(all_logfiles,all_roles) db_unique_name=orcl_sd' *.log_archive_dest_2='service=orcl_pri LGWR ASYNC valid_for=(online_logfiles,primary_role) db_unique_name=orcl_pri' *.log_archive_dest_3='service=orcl_sty LGWR ASYNC valid_for=(online_logfiles,primary_role) db_unique_name=orcl_sty' *.log_archive_dest_state_1='ENABLE' *.log_archive_dest_state_2='ENABLE' *.log_archive_dest_state_3='ENABLE' *.log_file_name_convert='/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/','/data/app/oracle/oradata/orcl/' *.open_cursors=300 *.pga_aggregate_target=2459959296 *.processes=1500 *.remote_login_passwordfile='EXCLUSIVE' *.sessions=1500 *.sga_target=7379877888 *.standby_file_management='AUTO' *.undo_tablespace='UNDOTBS1'
1.4，在主库把数据备份及控制文件和主库密码拷贝到备库
主：
[oracle@db rman_backup]$ rman target / RMAN> run { allocate channel c1 type disk; allocate channel c2 type disk; allocate channel c3 type disk; allocate channel c4 type disk; backup database format '/data/app/rman_backup/FULL_%U.bak'; backup archivelog all format '/data/app/rman_backup/ARC_%U.bak'; release channel c1; release channel c2; release channel c3; release channel c4; } #查看备份的数据然后打包 [oracle@db rman_backup]$ ll total 2810968 -rw-r----- 1 oracle oinstall 431243264 Jul 2 13:44 ARC_1ev4a2d1_1_1.bak -rw-r----- 1 oracle oinstall 422628864 Jul 2 13:44 ARC_1fv4a2d1_1_1.bak -rw-r----- 1 oracle oinstall 335458304 Jul 2 13:44 ARC_1gv4a2d1_1_1.bak -rw-r----- 1 oracle oinstall 250349056 Jul 2 13:44 ARC_1hv4a2d1_1_1.bak -rw-r----- 1 oracle oinstall 169233920 Jul 2 13:44 ARC_1iv4a2dg_1_1.bak -rw-r----- 1 oracle oinstall 668098560 Jul 2 13:43 FULL_18v4a2ck_1_1.bak -rw-r----- 1 oracle oinstall 587759616 Jul 2 13:43 FULL_19v4a2ck_1_1.bak -rw-r----- 1 oracle oinstall 2285568 Jul 2 13:43 FULL_1av4a2ck_1_1.bak -rw-r----- 1 oracle oinstall 9895936 Jul 2 13:43 FULL_1bv4a2cl_1_1.bak -rw-r----- 1 oracle oinstall 1376256 Jul 2 13:43 FULL_1cv4a2cr_1_1.bak -rw-r----- 1 oracle oinstall 98304 Jul 2 13:43 FULL_1dv4a2cu_1_1.bak [oracle@db rman_backup]$ du -sh 2.7G . [oracle@db rman_backup]$ tar -zcvf rmanbak.tgz ./ ./ ./FULL_18v4a2ck_1_1.bak ./FULL_19v4a2ck_1_1.bak ./FULL_1av4a2ck_1_1.bak ./FULL_1bv4a2cl_1_1.bak ./FULL_1cv4a2cr_1_1.bak ./FULL_1dv4a2cu_1_1.bak ./ARC_1ev4a2d1_1_1.bak ./ARC_1fv4a2d1_1_1.bak ./ARC_1gv4a2d1_1_1.bak ./ARC_1hv4a2d1_1_1.bak ./ARC_1iv4a2dg_1_1.bak tar: .: file changed as we read it #拷贝密码文件到此目录 [oracle@db dbs]$ cp orapworcl /data/app/rman_backup/
---拷贝控制文件到rman_backup目录下 SQL> alter database create standby controlfile as '/data/app/rman_backup/standby.ctl'; Database altered.
备2： #首先创建一个rman_backup目录 [oracle@dgd dbs]$ mkdir -p /data/app/rman_backup/ 主： #把数据文件及控制文件和密码传到备2 [oracle@db rman_backup]$ scp -p 12525 -l 100000 rmanbak.tgz standby.ctl orapworcl oracle@dgd:/data/app/rman_backup/
1.5，创建对应的目录
备2：
[oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/admin/orcl/adump p [oracle@dgd dbs]$mkdir -p $ORACLE_BASE/admin/orcl_sty/cdump [oracle@dgd dbs]$mkdir -p $ORACLE_BASE/diag/rdbms/orcl_sty/orcl_sty/trace [oracle@dgd dbs]$mkdir -p $ORACLE_BASE/diag/rdbms/orcl_sty/orcl/trace [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/admin/orcl/dpdump [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/admin/orcl/cdump [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/diag/rdbms/orcl_pri/orcl/trace [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/admin/orcl_sty/adump [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/admin/orcl_sty/dpdump [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/admin/orcl_sty/cdump [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/diag/rdbms/orcl_sty/orcl_sty/trace [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/diag/rdbms/orcl_sty/orcl/trace [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/fast_recovery_area/ [oracle@dgd dbs]$ mkdir -p $ORACLE_BASE/oradata/orcl [oracle@dgd dbs]$ cd /data/app/rman_backup/ [oracle@dgd rman_backup]$ mkdir -p /data/app/oracle/fast_recovery_area/orcl/ [oracle@dgd rman_backup]$ cp /data/app/rman_backup/standby.ctl /data/app/oracle/oradata/orcl/control01.ctl [oracle@dgd rman_backup]$ cp /data/app/rman_backup/standby.ctl /data/app/oracle/fast_recovery_area/orcl/control02.ctl [oracle@dgd rman_backup]$ cp orapworcl $OROACLE_HOME/dbs/
1.6，启动备2到nomount状态
使用初始化文件启动备库到nomount状态
备2：
SQL> startup pfile='/data/app/oracle/product/11.2.0.4/db_1/dbs/initorcl_sd.ora' nomount; ORACLE instance started. Total System Global Area 7349010432 bytes Fixed Size 2267464 bytes Variable Size 1728054968 bytes Database Buffers 5603590144 bytes Redo Buffers 15097856 bytes SQL> create spfile from pfile='/data/app/oracle/product/11.2.0.4/db_1/dbs/initorcl_sd.ora'; File created.
1.8，备份恢复
[oracle@dgd rman_backup]$ rman target / Recovery Manager: Release 11.2.0.4.0 - Production on Thu Jul 2 13:58:52 2020 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. connected to target database: ORCL (not mounted) RMAN> restore controlfile from '/data/app/oracle/oradata/orcl/control01.ctl'; Starting restore at 2020-07-02 13:59:05 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=572 device type=DISK channel ORA_DISK_1: copied control file copy output file name=/data/app/oracle/oradata/orcl/control01.ctl output file name=/data/app/oracle/fast_recovery_area/orcl/control02.ctl Finished restore at 2020-07-02 13:59:06 RMAN> exit Recovery Manager complete.
1.9，切换备库2到mount状态
备2：
[oracle@dgd ~]$ sqlplus / as sysdba SQL> alter database mount; Database altered. SQL> select status from v$instance; STATUS ------------ MOUNTED #解压备份数据 [oracle@dgd rman_backup]$ tar -zxf rmanbak.tgz [oracle@dgd rman_backup]$ mv rmanbak.tgz orapworcl standby.ctl /tmp/ #恢复数据 [oracle@dgd rman_backup]$ rman target / Recovery Manager: Release 11.2.0.4.0 - Production on Tue Jun 30 15:17:03 2020 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. connected to target database: ORCL (DBID=1570902142, not open) RMAN> catalog start with '/data/app/rman_backup/'; Starting implicit crosscheck backup at 2020-06-30 15:17:12 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=1141 device type=DISK Crosschecked 18 objects Finished implicit crosscheck backup at 2020-06-30 15:17:13 Starting implicit crosscheck copy at 2020-06-30 15:17:13 using channel ORA_DISK_1 Crosschecked 2 objects Finished implicit crosscheck copy at 2020-06-30 15:17:13 searching for all files in the recovery area cataloging files... no files cataloged searching for all files that match the pattern /data/app/rman_backup/ List of Files Unknown to the Database ===================================== File Name: /data/app/rman_backup/ARC_0pv3fgs6_1_1.bak File Name: /data/app/rman_backup/ARC_0qv3fgs6_1_1.bak File Name: /data/app/rman_backup/ARC_0rv3fgs6_1_1.bak File Name: /data/app/rman_backup/ARC_0sv3fgs6_1_1.bak File Name: /data/app/rman_backup/FULL_0jv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0kv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0lv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0mv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0nv3fgru_1_1.bak File Name: /data/app/rman_backup/FULL_0ov3fgs4_1_1.bak Do you really want to catalog the above files (enter YES or NO)? yes cataloging files... cataloging done List of Cataloged Files ======================= File Name: /data/app/rman_backup/ARC_0pv3fgs6_1_1.bak File Name: /data/app/rman_backup/ARC_0qv3fgs6_1_1.bak File Name: /data/app/rman_backup/ARC_0rv3fgs6_1_1.bak File Name: /data/app/rman_backup/ARC_0sv3fgs6_1_1.bak File Name: /data/app/rman_backup/FULL_0jv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0kv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0lv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0mv3fgrt_1_1.bak File Name: /data/app/rman_backup/FULL_0nv3fgru_1_1.bak File Name: /data/app/rman_backup/FULL_0ov3fgs4_1_1.bak RMAN> run { allocate channel c1 type disk; allocate channel c2 type disk; allocate channel c3 type disk; allocate channel c4 type disk; restore database ; release channel c1; release channel c2; release channel c3; release channel c4; } released channel: ORA_DISK_1 allocated channel: c1 channel c1: SID=1141 device type=DISK allocated channel: c2 channel c2: SID=1711 device type=DISK allocated channel: c3 channel c3: SID=7 device type=DISK allocated channel: c4 channel c4: SID=575 device type=DISK Starting restore at 2020-06-30 15:17:30 channel c1: starting datafile backup set restore channel c1: specifying datafile(s) to restore from backup set channel c1: restoring datafile 00001 to /data/app/oracle/oradata/orcl/system01.dbf channel c1: reading from backup piece /data/app/rman_backup/FULL_0jv3fgrt_1_1.bak channel c2: starting datafile backup set restore channel c2: specifying datafile(s) to restore from backup set channel c2: restoring datafile 00002 to /data/app/oracle/oradata/orcl/sysaux01.dbf channel c2: reading from backup piece /data/app/rman_backup/FULL_0kv3fgrt_1_1.bak channel c3: starting datafile backup set restore channel c3: specifying datafile(s) to restore from backup set channel c3: restoring datafile 00003 to /data/app/oracle/oradata/orcl/undotbs01.dbf channel c3: reading from backup piece /data/app/rman_backup/FULL_0lv3fgrt_1_1.bak channel c4: starting datafile backup set restore channel c4: specifying datafile(s) to restore from backup set channel c4: restoring datafile 00004 to /data/app/oracle/oradata/orcl/users01.dbf channel c4: reading from backup piece /data/app/rman_backup/FULL_0nv3fgru_1_1.bak channel c4: piece handle=/data/app/rman_backup/FULL_0nv3fgru_1_1.bak tag=TAG20200623T120516 channel c4: restored backup piece 1 channel c4: restore complete, elapsed time: 00:00:01 channel c3: piece handle=/data/app/rman_backup/FULL_0lv3fgrt_1_1.bak tag=TAG20200623T120516 channel c3: restored backup piece 1 channel c3: restore complete, elapsed time: 00:00:03 channel c1: piece handle=/data/app/rman_backup/FULL_0jv3fgrt_1_1.bak tag=TAG20200623T120516 channel c1: restored backup piece 1 channel c1: restore complete, elapsed time: 00:00:25 channel c2: piece handle=/data/app/rman_backup/FULL_0kv3fgrt_1_1.bak tag=TAG20200623T120516 channel c2: restored backup piece 1 channel c2: restore complete, elapsed time: 00:00:25 Finished restore at 2020-06-30 15:17:55 released channel: c1 released channel: c2 released channel: c3 released channel: c4 RMAN>
1.10，再次检查关闭防火墙和selinux
[oracle@dgd trace]$ setenforce 0 [root@dgd ]$ systemctl stop firewalld
1.11，启动备库
备2：
SQL> shutdown immediate; ORA-01109: database not open Database dismounted. ORACLE instance shut down. SQL> startup nomount; ORACLE instance started. Total System Global Area 7349010432 bytes Fixed Size 2267464 bytes Variable Size 1744832184 bytes Database Buffers 5586812928 bytes Redo Buffers 15097856 bytes SQL> alter database mount standby database; Database altered. SQL> show parameter spfile; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ spfile string /data/app/oracle/product/11.2. 0.4/db_1/dbs/spfileorcl.ora SQL> alter database add standby logfile; Database altered. SQL> alter database recover managed standby database using current logfile disconnect from session; Database altered. SQL> select status from v$instance; STATUS ------------ MOUNTED --取消日志应用 SQL> alter database recover managed standby database cancel; Database altered. --以open模式打开数据库 SQL> alter database open; Database altered. SQL> select status from v$instance; STATUS ------------ OPEN --开启日志应用 SQL> alter database recover managed standby database using current logfile disconnect from session; Database altered. --查询数据库模式是否正常 SQL> set lin 3000 pages 300; SQL> select dbid,name,open_mode,current_scn,protection_mode,database_role,force_logging,open_mode,switchover_status from v$database; DBID NAME OPEN_MODE CURRENT_SCN PROTECTION_MODE DATABASE_ROLE FOR OPEN_MODE SWITCHOVER_STATUS ---------- --------- -------------------- ----------- -------------------- ---------------- --- -------------------- -------------------- 1570902142 ORCL READ ONLY WITH APPLY 2200209 MAXIMUM PERFORMANCE PHYSICAL STANDBY YES READ ONLY WITH APPLY NOT ALLOWED
2,验证
2.1，查看备2RFS和MRP应用日志进程
SQL> set lin 3000 pages 3000; SQL> select process,sequence#,status,delay_mins from v$managed_standby; PROCESS SEQUENCE# STATUS DELAY_MINS --------- ---------- ------------ ---------- ARCH 106 CLOSING 0 ARCH 105 CLOSING 0 ARCH 0 CONNECTED 0 ARCH 107 CLOSING 0 MRP0 108 APPLYING_LOG 0 RFS 0 IDLE 0 RFS 108 IDLE 0 RFS 0 IDLE 0 8 rows selected.
2.2，切日志查看archive log list序列是否一致
主：
SQL> alter system switch logfile; System altered. SQL> archive log list; Database log mode Archive Mode Automatic archival Enabled Archive destination USE_DB_RECOVERY_FILE_DEST Oldest online log sequence 108 Next log sequence to archive 110 Current log sequence 110
备1：
SQL> archive log list; Database log mode Archive Mode Automatic archival Enabled Archive destination USE_DB_RECOVERY_FILE_DEST Oldest online log sequence 108 Next log sequence to archive 0 Current log sequence 110
备2：
SQL> archive log list; Database log mode Archive Mode Automatic archival Enabled Archive destination USE_DB_RECOVERY_FILE_DEST Oldest online log sequence 109 Next log sequence to archive 0 Current log sequence 110
2.3，数据测试
主：
SQL> alter system switch logfile; System altered. SQL> create table test as select * from dba_objects; Table created. SQL> insert into test select * from test; 86276 rows created. SQL> insert into test select * from test; 172552 rows created. SQL> insert into test select * from test; 345104 rows created. SQL> commit; Commit complete. SQL> insert into test select * from test; 690208 rows created. SQL> commit; Commit complete. SQL> insert into test select * from test; 1380416 rows created. SQL> commit; Commit complete. SQL> select count(*) from test; COUNT(*) ---------- 2760832
备1：
SQL> select count(*) from test; COUNT(*) ---------- 2760832 SQL>
备2：
SQL> select count(*) from test; COUNT(*) ---------- 2760832
删除此数据：
主：
SQL> drop table test; Table dropped. SQL> select count(*) from test; select count(*) from test * ERROR at line 1: ORA-00942: table or view does not exist
备1：
SQL> select count(*) from test; select count(*) from test * ERROR at line 1: ORA-00942: table or view does not exist
备2：
SQL> select count(*) from test; select count(*) from test * ERROR at line 1: ORA-00942: table or view does not exist
