通过RMAN克隆数据库（基于备份）
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SQL> show parameter name; NAME TYPE VALUE ------------------------------------ ----------------------------------------- db_file_name_convert string db_name string orcl db_unique_name string orcl global_names boolean FALSE instance_name string orcl lock_name_space string log_file_name_convert string service_names string orcl SQL> select current_scn from v$database; CURRENT_SCN ----------- 1015897
备份数据库
[[email protected]]$ rman target /
RecoveryManager: Release 11.2.0.1.0 - Production on Wed Jan 27 23:18:24 2016
Copyright(c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connectedto target database: ORCL (DBID=1426154421)
RMAN> run{
allocate channel c1 type disk;
allocate channel c2 type disk;
backup filesperset 3 database format‘/u01/app/backup/full_%d_%T_%s_%p‘;
sql ‘alter system archive log current‘;
sql ‘alter system archive log current‘;
sql ‘alter system archive log current‘;
backup archivelog all format‘/u01/app/backup/arch_%d_%T_%s_%p‘ delete input;
backup current controlfile format‘/u01/app/backup/ctl_%d_%T_%s_%p‘;
}
SQL> col file_name for a50 SQL> select FILE_ID,FILE_NAME,TABLESPACE_NAME fromdba_data_files; FILE_IDFILE_NAME TABLESPACE_NAME ---------- -------------------------------------------------------------------------------- 4/u01/app/oracle/oradata/orcl/users01.dbf USERS 3/u01/app/oracle/oradata/orcl/undotbs01.dbf UNDOTBS1 2/u01/app/oracle/oradata/orcl/sysaux01.dbf SYSAUX 1/u01/app/oracle/oradata/orcl/system01.dbf SYSTEM 5/u01/app/oracle/oradata/orcl/example01.dbf EXAMPLE 6/u01/app/oracle/oradata/orcl/heleitbs01.dbf HELEITBS 6 rows selected.
建立Pfile文件
SQL>create pfile from spfile; Filecreated.
建立克隆库的目录
[[email protected] ~]$ mkdir -p$ORACLE_BASE/admin/clonedb/bdump [[email protected] ~]$ mkdir -p$ORACLE_BASE/admin/clonedb/cdump [[email protected] ~]$ mkdir -p$ORACLE_BASE/admin/clonedb/udump [[email protected] ~]$ mkdir -p $ORACLE_BASE/oradata/clonedb
将主库pfile拷贝成名为克隆库名的文件，将其拷贝至备机，并在备机生成克隆库的口令文件
[[email protected]]$ cp initorcl.ora initclonedb.ora [[email protected]]$ orapwd file=orapwclonedb password=MANAGER entries=30
vi initclonedb.ora
将orcl替换为clonedb，并增加以下内容：
db_file_name_convert = ("/u01/app/oracle/oradata/db01","/u01/app/oracle/oradata/clonedb")log_file_name_convert =("/disk1/oradata/db01","/disk1/oradata/clonedb","/disk2/oradata/db01","/disk2/oradata/clonedb")
注：11g默认开启审计，我们这里不需要，所以上述克隆步骤不包含审计目录，如果没关审计功能，pfile注释掉*.audit_file_dest这行，*.audit_trail=‘none‘即可，
如何查看和关闭审计功能：
SQL>show parameter audi; NAME TYPE VALUE ----------------------------------------------- ------------------------------ audit_file_dest string /u01/app/oracle/admin/orcl/adu mp audit_sys_operations boolean FALSE audit_syslog_level string audit_trail string DB SQL>alter system set audit_trail=none scope=spfile; Systemaltered. SQL>shutdown immediate; Databaseclosed. Databasedismounted. ORACLEinstance shut down. SQL>startup ORACLEinstance started.
将主库之前创建的initclonedb拷贝到备库
将clone库启动到nomount
[[email protected] dbs]$ export ORACLE_SID=clonedb [[email protected] dbs]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.1.0 Production on Thu Jan 28 00:42:58 2016 Copyright (c) 1982, 2009, Oracle. All rights reserved. Connected to an idle instance. SQL> startup pfile=$ORACLE_HOME/dbs/initclonedb.ora nomount; ORACLE instance started.
用RMAN连接主库和clone库
[[email protected]]$ rman target sys/[email protected] auxiliary sys/MANAGER RecoveryManager: Release 11.2.0.1.0 - Production on Thu Jan 28 01:24:35 2016 Copyright(c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. connectedto target database: ORCL (DBID=1426154421) connectedto auxiliary database: CLONEDB (not mounted) RMAN> RMAN>list backup; Listof Backup Sets =================== BSKey Type LV Size Device Type Elapsed Time Completion Time ----------- -- ---------- ----------- ------------ --------------- 1 Full 436.71M DISK 00:01:02 27-JAN-16 BP Key: 1 Status: AVAILABLE Compressed: NO Tag: TAG20160127T231840 Piece Name:/u01/app/backup/full_ORCL_20160127_2_1 List of Datafiles in backup set 1 File LV Type Ckp SCN Ckp Time Name ---- -- ---- ---------- --------- ---- 2 Full 1015955 27-JAN-16/u01/app/oracle/oradata/orcl/sysaux01.dbf 3 Full 1015955 27-JAN-16/u01/app/oracle/oradata/orcl/undotbs01.dbf 6 Full 1015955 27-JAN-16/u01/app/oracle/oradata/orcl/heleitbs01.dbf BSKey Type LV Size Device Type Elapsed Time Completion Time ----------- -- ---------- ----------- ------------ --------------- 2 Full 9.33M DISK 00:00:08 27-JAN-16 BP Key: 2 Status: AVAILABLE Compressed: NO Tag: TAG20160127T231840 Piece Name:/u01/app/backup/full_ORCL_20160127_3_1 Control File Included: Ckp SCN: 1015986 Ckp time: 27-JAN-16 BSKey Type LV Size Device Type Elapsed Time Completion Time ----------- -- ---------- ----------- ------------ --------------- 3 Full 660.65M DISK 00:01:22 27-JAN-16 BP Key: 3 Status: AVAILABLE Compressed: NO Tag: TAG20160127T231840 Piece Name:/u01/app/backup/full_ORCL_20160127_1_1 List of Datafiles in backup set 3 File LV Type Ckp SCN Ckp Time Name ---- -- ---- ---------- --------- ---- 1 Full 1015954 27-JAN-16/u01/app/oracle/oradata/orcl/system01.dbf 4 Full 1015954 27-JAN-16/u01/app/oracle/oradata/orcl/users01.dbf 5 Full 1015954 27-JAN-16/u01/app/oracle/oradata/orcl/example01.dbf BSKey Type LV Size Device Type Elapsed Time Completion Time ----------- -- ---------- ----------- ------------ --------------- 4 Full 80.00K DISK 00:00:04 27-JAN-16 BP Key: 4 Status: AVAILABLE Compressed: NO Tag: TAG20160127T231840 Piece Name:/u01/app/backup/full_ORCL_20160127_4_1 SPFILE Included: Modification time: 27-JAN-16 SPFILE db_unique_name: ORCL BSKey Size Device Type Elapsed Time Completion Time ----------------- ----------- ------------ --------------- 5 14.34M DISK 00:00:01 27-JAN-16 BP Key: 5 Status: AVAILABLE Compressed: NO Tag: TAG20160127T232008 Piece Name:/u01/app/backup/arch_ORCL_20160127_5_1 List of Archived Logs in backup set 5 Thrd Seq Low SCN Low Time Next SCN Next Time ---- ------- ---------- --------- ------------------- 1 5 1011640 13-DEC-15 1016002 27-JAN-16 BSKey Size Device Type Elapsed Time Completion Time ----------------- ----------- ------------ --------------- 6 3.00K DISK 00:00:01 27-JAN-16 BP Key: 6 Status: AVAILABLE Compressed: NO Tag: TAG20160127T232008 Piece Name:/u01/app/backup/arch_ORCL_20160127_6_1 List of Archived Logs in backup set 6 Thrd Seq Low SCN Low Time Next SCN Next Time ---- ------- ---------- --------- ------------------- 1 6 1016002 27-JAN-16 1016011 27-JAN-16 1 7 1016011 27-JAN-16 1016020 27-JAN-16 BSKey Size Device Type Elapsed Time Completion Time ----------------- ----------- ------------ --------------- 7 2.00K DISK 00:00:01 27-JAN-16 BP Key: 7 Status: AVAILABLE Compressed: NO Tag: TAG20160127T232008 Piece Name:/u01/app/backup/arch_ORCL_20160127_7_1 List of Archived Logs in backup set 7 Thrd Seq Low SCN Low Time Next SCN Next Time ---- ------- ---------- --------- ------------------- 1 8 1016020 27-JAN-16 1016028 27-JAN-16 BSKey Type LV Size Device Type Elapsed Time Completion Time ----------- -- ---------- ----------- ------------ --------------- 8 Full 9.33M DISK 00:00:01 27-JAN-16 BP Key: 8 Status: AVAILABLE Compressed: NO Tag: TAG20160127T232010 Piece Name:/u01/app/backup/ctl_ORCL_20160127_8_1 Control File Included: Ckp SCN: 1016045 Ckp time: 27-JAN-16
将主库备份文件拷贝至备库相应备份目录后，执行RMAN复制
RMAN>duplicate target database to clonedb;
StartingDuplicate Db at 28-JAN-16
usingtarget database control file instead of recovery catalog
allocatedchannel: ORA_AUX_DISK_1
channelORA_AUX_DISK_1: SID=20 device type=DISK
contentsof Memory Script:
{
sql clone "create spfile frommemory";
}
executingMemory Script
sqlstatement: create spfile from memory
contentsof Memory Script:
{
shutdown clone immediate;
startup clone nomount;
}
executingMemory Script
Oracleinstance shut down
connectedto auxiliary database (not started)
Oracleinstance started
TotalSystem Global Area 630501376 bytes
FixedSize 2215984 bytes
VariableSize 188747728 bytes
DatabaseBuffers 436207616 bytes
RedoBuffers 3330048 bytes
contentsof Memory Script:
{
sql clone "alter system set db_name =
‘‘ORCL‘‘ comment=
‘‘Modified by RMAN duplicate‘‘scope=spfile";
sql clone "alter system set db_unique_name =
‘‘CLONEDB‘‘ comment=
‘‘Modified by RMAN duplicate‘‘scope=spfile";
shutdown clone immediate;
startup clone force nomount
restore clone primary controlfile;
alter clone database mount;
}
executingMemory Script
sqlstatement: alter system set db_name= ‘‘ORCL‘‘ comment= ‘‘Modified by RMANduplicate‘‘ scope=spfile
sqlstatement: alter system set db_unique_name = ‘‘CLONEDB‘‘comment= ‘‘Modified by RMAN duplicate‘‘ scope=spfile
Oracleinstance shut down
Oracleinstance started
TotalSystem Global Area 630501376 bytes
FixedSize 2215984 bytes
VariableSize 188747728 bytes
DatabaseBuffers 436207616 bytes
RedoBuffers 3330048 bytes
Startingrestore at 28-JAN-16
allocatedchannel: ORA_AUX_DISK_1
channelORA_AUX_DISK_1: SID=19 device type=DISK
channelORA_AUX_DISK_1: starting datafile backup set restore
channelORA_AUX_DISK_1: restoring control file
channelORA_AUX_DISK_1: reading from backup piece /u01/app/backup/ctl_ORCL_20160127_8_1
channelORA_AUX_DISK_1: piece handle=/u01/app/backup/ctl_ORCL_20160127_8_1tag=TAG20160127T232010
channelORA_AUX_DISK_1: restored backup piece 1
channelORA_AUX_DISK_1: restore complete, elapsed time: 00:00:04
outputfile name=/u01/app/oracle/oradata/clonedb/control01.ctl
outputfile name=/u01/app/oracle/oradata/clonedb/control02.ctl
Finishedrestore at 28-JAN-16
databasemounted
contentsof Memory Script:
{
set until scn 1019371;
set newname for datafile 1 to
"/u01/app/oracle/oradata/clonedb/system01.dbf";
set newname for datafile 2 to
"/u01/app/oracle/oradata/clonedb/sysaux01.dbf";
set newname for datafile 3 to
"/u01/app/oracle/oradata/clonedb/undotbs01.dbf";
set newname for datafile 4 to
"/u01/app/oracle/oradata/clonedb/users01.dbf";
set newname for datafile 5 to
"/u01/app/oracle/oradata/clonedb/example01.dbf";
set newname for datafile 6 to
"/u01/app/oracle/oradata/clonedb/heleitbs01.dbf";
restore
clone database
;
}
executingMemory Script
executingcommand: SET until clause
executingcommand: SET NEWNAME
executingcommand: SET NEWNAME
executingcommand: SET NEWNAME
executingcommand: SET NEWNAME
executingcommand: SET NEWNAME
executingcommand: SET NEWNAME
Startingrestore at 28-JAN-16
usingchannel ORA_AUX_DISK_1
channelORA_AUX_DISK_1: starting datafile backup set restore
channelORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channelORA_AUX_DISK_1: restoring datafile 00002 to/u01/app/oracle/oradata/clonedb/sysaux01.dbf
channelORA_AUX_DISK_1: restoring datafile 00003 to/u01/app/oracle/oradata/clonedb/undotbs01.dbf
channelORA_AUX_DISK_1: restoring datafile 00006 to/u01/app/oracle/oradata/clonedb/heleitbs01.dbf
channelORA_AUX_DISK_1: reading from backup piece/u01/app/backup/full_ORCL_20160127_2_1
channelORA_AUX_DISK_1: piece handle=/u01/app/backup/full_ORCL_20160127_2_1tag=TAG20160127T231840
channelORA_AUX_DISK_1: restored backup piece 1
channelORA_AUX_DISK_1: restore complete, elapsed time: 00:00:56
channelORA_AUX_DISK_1: starting datafile backup set restore
channelORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channelORA_AUX_DISK_1: restoring datafile 00001 to/u01/app/oracle/oradata/clonedb/system01.dbf
channelORA_AUX_DISK_1: restoring datafile 00004 to/u01/app/oracle/oradata/clonedb/users01.dbf
channelORA_AUX_DISK_1: restoring datafile 00005 to/u01/app/oracle/oradata/clonedb/example01.dbf
channelORA_AUX_DISK_1: reading from backup piece/u01/app/backup/full_ORCL_20160127_1_1
channelORA_AUX_DISK_1: piece handle=/u01/app/backup/full_ORCL_20160127_1_1tag=TAG20160127T231840
channelORA_AUX_DISK_1: restored backup piece 1
channelORA_AUX_DISK_1: restore complete, elapsed time: 00:01:07
Finishedrestore at 28-JAN-16
contentsof Memory Script:
{
switch clone datafile all;
}
executingMemory Script
datafile1 switched to datafile copy
inputdatafile copy RECID=8 STAMP=902341117 filename=/u01/app/oracle/oradata/clonedb/system01.dbf
datafile2 switched to datafile copy
inputdatafile copy RECID=9 STAMP=902341117 filename=/u01/app/oracle/oradata/clonedb/sysaux01.dbf
datafile3 switched to datafile copy
inputdatafile copy RECID=10 STAMP=902341117 filename=/u01/app/oracle/oradata/clonedb/undotbs01.dbf
datafile4 switched to datafile copy
inputdatafile copy RECID=11 STAMP=902341117 filename=/u01/app/oracle/oradata/clonedb/users01.dbf
datafile5 switched to datafile copy
inputdatafile copy RECID=12 STAMP=902341118 filename=/u01/app/oracle/oradata/clonedb/example01.dbf
datafile6 switched to datafile copy
inputdatafile copy RECID=13 STAMP=902341118 filename=/u01/app/oracle/oradata/clonedb/heleitbs01.dbf
contentsof Memory Script:
{
set until scn 1019371;
recover
clone database
delete archivelog
;
}
executingMemory Script
executingcommand: SET until clause
Startingrecover at 28-JAN-16
usingchannel ORA_AUX_DISK_1
startingmedia recovery
archivedlog for thread 1 with sequence 9 is already on disk as file/u01/archivelog/1_9_898373685.dbf
channelORA_AUX_DISK_1: starting archived log restore to default destination
channelORA_AUX_DISK_1: restoring archived log
archivedlog thread=1 sequence=5
channelORA_AUX_DISK_1: reading from backup piece/u01/app/backup/arch_ORCL_20160127_5_1
channelORA_AUX_DISK_1: piece handle=/u01/app/backup/arch_ORCL_20160127_5_1tag=TAG20160127T232008
channelORA_AUX_DISK_1: restored backup piece 1
channelORA_AUX_DISK_1: restore complete, elapsed time: 00:00:03
archivedlog file name=/u01/archivelog/1_5_898373685.dbf thread=1 sequence=5
channelclone_default: deleting archived log(s)
archivedlog file name=/u01/archivelog/1_5_898373685.dbf RECID=5 STAMP=902341120
channelORA_AUX_DISK_1: starting archived log restore to default destination
channelORA_AUX_DISK_1: restoring archived log
archivedlog thread=1 sequence=6
channelORA_AUX_DISK_1: restoring archived log
archivedlog thread=1 sequence=7
channelORA_AUX_DISK_1: reading from backup piece/u01/app/backup/arch_ORCL_20160127_6_1
channelORA_AUX_DISK_1: piece handle=/u01/app/backup/arch_ORCL_20160127_6_1tag=TAG20160127T232008
channelORA_AUX_DISK_1: restored backup piece 1
channelORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
archivedlog file name=/u01/archivelog/1_6_898373685.dbf thread=1 sequence=6
channelclone_default: deleting archived log(s)
archivedlog file name=/u01/archivelog/1_6_898373685.dbf RECID=7 STAMP=902341122
archivedlog file name=/u01/archivelog/1_7_898373685.dbf thread=1 sequence=7
channelclone_default: deleting archived log(s)
archivedlog file name=/u01/archivelog/1_7_898373685.dbf RECID=6 STAMP=902341122
channelORA_AUX_DISK_1: starting archived log restore to default destination
channelORA_AUX_DISK_1: restoring archived log
archivedlog thread=1 sequence=8
channelORA_AUX_DISK_1: reading from backup piece/u01/app/backup/arch_ORCL_20160127_7_1
channelORA_AUX_DISK_1: piece handle=/u01/app/backup/arch_ORCL_20160127_7_1tag=TAG20160127T232008
channelORA_AUX_DISK_1: restored backup piece 1
channelORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
archivedlog file name=/u01/archivelog/1_8_898373685.dbf thread=1 sequence=8
channelclone_default: deleting archived log(s)
archivedlog file name=/u01/archivelog/1_8_898373685.dbf RECID=8 STAMP=902341123
archivedlog file name=/u01/archivelog/1_9_898373685.dbf thread=1 sequence=9
mediarecovery complete, elapsed time: 00:00:05
Finishedrecover at 28-JAN-16
contentsof Memory Script:
{
shutdown clone immediate;
startup clone nomount;
sql clone "alter system set db_name =
‘‘CLONEDB‘‘ comment=
‘‘Reset to original value by RMAN‘‘scope=spfile";
sql clone "alter system reset db_unique_name scope=spfile";
shutdown clone immediate;
startup clone nomount;
}
executingMemory Script
databasedismounted
Oracleinstance shut down
connectedto auxiliary database (not started)
Oracleinstance started
TotalSystem Global Area 630501376 bytes
FixedSize 2215984 bytes
VariableSize 188747728 bytes
DatabaseBuffers 436207616 bytes
RedoBuffers 3330048 bytes
sqlstatement: alter system set db_name= ‘‘CLONEDB‘‘ comment= ‘‘Reset tooriginal value by RMAN‘‘ scope=spfile
sqlstatement: alter system reset db_unique_name scope=spfile
Oracleinstance shut down
connectedto auxiliary database (not started)
Oracleinstance started
TotalSystem Global Area 630501376 bytes
FixedSize 2215984 bytes
VariableSize 188747728 bytes
DatabaseBuffers 436207616 bytes
RedoBuffers 3330048 bytes
sqlstatement: CREATE CONTROLFILE REUSE SET DATABASE "CLONEDB" RESETLOGSARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 292
LOGFILE
GROUP 1 ( ‘/u01/app/oracle/oradata/clonedb/redo01.log‘ ) SIZE 50 M REUSE,
GROUP 2 ( ‘/u01/app/oracle/oradata/clonedb/redo02.log‘ ) SIZE 50 M REUSE,
GROUP 3 ( ‘/u01/app/oracle/oradata/clonedb/redo03.log‘ ) SIZE 50 M REUSE
DATAFILE
‘/u01/app/oracle/oradata/clonedb/system01.dbf‘
CHARACTER SET ZHS16GBK
contentsof Memory Script:
{
set newname for tempfile 1 to
"/u01/app/oracle/oradata/clonedb/temp01.dbf";
switch clone tempfile all;
catalog clone datafilecopy "/u01/app/oracle/oradata/clonedb/sysaux01.dbf",
"/u01/app/oracle/oradata/clonedb/undotbs01.dbf",
"/u01/app/oracle/oradata/clonedb/users01.dbf",
"/u01/app/oracle/oradata/clonedb/example01.dbf",
"/u01/app/oracle/oradata/clonedb/heleitbs01.dbf";
switch clone datafile all;
}
executingMemory Script
executingcommand: SET NEWNAME
renamedtempfile 1 to /u01/app/oracle/oradata/clonedb/temp01.dbf in control file
catalogeddatafile copy
datafilecopy file name=/u01/app/oracle/oradata/clonedb/sysaux01.dbf RECID=1STAMP=902341136
catalogeddatafile copy
datafilecopy file name=/u01/app/oracle/oradata/clonedb/undotbs01.dbf RECID=2STAMP=902341136
catalogeddatafile copy
datafilecopy file name=/u01/app/oracle/oradata/clonedb/users01.dbf RECID=3STAMP=902341136
catalogeddatafile copy
datafilecopy file name=/u01/app/oracle/oradata/clonedb/example01.dbf RECID=4STAMP=902341136
catalogeddatafile copy
datafilecopy file name=/u01/app/oracle/oradata/clonedb/heleitbs01.dbf RECID=5STAMP=902341136
datafile2 switched to datafile copy
inputdatafile copy RECID=1 STAMP=902341136 filename=/u01/app/oracle/oradata/clonedb/sysaux01.dbf
datafile3 switched to datafile copy
inputdatafile copy RECID=2 STAMP=902341136 filename=/u01/app/oracle/oradata/clonedb/undotbs01.dbf
datafile4 switched to datafile copy
inputdatafile copy RECID=3 STAMP=902341136 filename=/u01/app/oracle/oradata/clonedb/users01.dbf
datafile5 switched to datafile copy
inputdatafile copy RECID=4 STAMP=902341136 filename=/u01/app/oracle/oradata/clonedb/example01.dbf
datafile6 switched to datafile copy
inputdatafile copy RECID=5 STAMP=902341136 filename=/u01/app/oracle/oradata/clonedb/heleitbs01.dbf
contentsof Memory Script:
{
Alter clone database open resetlogs;
}
executingMemory Script
databaseopened
FinishedDuplicate Db at 28-JAN-16
克隆成功，打开克隆库查看
SQL>show parameter name; NAME TYPE VALUE ----------------------------------------------- ------------------------------ db_file_name_convert string /u01/app/oracle/oradata/orcl, /u01/app/oracle/oradata/cloned b db_name string CLONEDB db_unique_name string CLONEDB global_names boolean FALSE instance_name string clonedb lock_name_space string log_file_name_convert string /u01/app/oracle/oradata/orcl, /u01/app/oracle/oradata/cloned b NAME TYPE VALUE ----------------------------------------------- ------------------------------ service_names string CLONEDB SQL>select status from v$instance; STATUS ------------ OPEN SQL>select name from v$datafile; NAME -------------------------------------------------------------------------------- /u01/app/oracle/oradata/clonedb/system01.dbf /u01/app/oracle/oradata/clonedb/sysaux01.dbf /u01/app/oracle/oradata/clonedb/undotbs01.dbf /u01/app/oracle/oradata/clonedb/users01.dbf /u01/app/oracle/oradata/clonedb/example01.dbf /u01/app/oracle/oradata/clonedb/heleitbs01.dbf 6rows selected. SQL>select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC -------------------- ---------- ---------- ---------- ---------- --- STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE#NEXT_TIME ----------------------------- ------------ ------------ ------------ 1 1 1 52428800 512 1NO CURRENT 1019372 28-JAN-16 2.8147E+14 2 1 0 52428800 512 1YES UNUSED 0 0 3 1 0 52428800 512 1YES UNUSED 0 0 SQL>alter system switch logfile; Systemaltered. SQL>/ Systemaltered. SQL>/ Systemaltered. SQL>select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC -------------------- ---------- ---------- ---------- ---------- --- STATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE#NEXT_TIME ----------------------------- ------------ ------------ ------------ 1 1 4 52428800 512 1NO CURRENT 1020327 28-JAN-16 2.8147E+14 2 1 2 52428800 512 1YES INACTIVE 102032028-JAN-16 1020323 28-JAN-16 3 1 3 52428800 512 1YES INACTIVE 102032328-JAN-16 1020327 28-JAN-16
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