Shulou(Shulou.com)06/01 Report--

View the status of redo log groups and the location of logs.

SQL > select * from v$log

GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARCSTATUS FIRST_CHANGE#FIRST_TIME NEXT_CHANGE# NEXT_TIME

1 1 10 52428800 512 1YES INACTIVE 102400224-NOV-15 1026535 24-NOV-15

2 1 11 52428800 512 1YES ACTIVE 102653524-NOV-15 1039876 27-NOV-15

3 1 12 52428800 512 1NO CURRENT 1039876 27-NOV-15 2.8147E+14

SQL > col memberfor A50

SQL > select * from v$logfile

GROUP# STATUS TYPE MEMBER IS_

3 ONLINE / u01/apps/oracle/oradata/orcl/redo03.log NO

2 ONLINE / u01/apps/oracle/oradata/orcl/redo02.log NO

1 ONLINE / u01/apps/oracle/oradata/orcl/redo01.log NO

Establish the path where the system will store log groups.

SQL >! mkdir-p/u01/apps/oracle/oradata/orcl/redo

SQL > alter database add logfile group4 ('/ u01ax size size 50m)

Database altered.

Establish diversity for each redo log group.

SQL > alter database add logfilemember'/ u01qappsUniplicateoracle.oradataUniplicationorclPlanceRedoLog'to group 1

Databasealtered.

SQL > alter database add logfilemember'/ u01 to group to group 2

Databasealtered.

SQL > alter database add logfilemember'/ u01 to group to group 3

Databasealtered.

SQL > alter database add logfilemember'/ u01 to group to group 4

Databasealtered.

Check the status of redo, combination 4 is not used, so cut the log several times, combination 4 has taken effect.

SQL > select * from v$log

GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARCSTATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME

-

1 1 10 52428800 512 2YES INACTIVE 102400224-NOV-15 1026535 24-NOV-15

2 1 11 52428800 512 2YES INACTIVE 102653524-NOV-15 1039876 27-NOV-15

3 1 12 52428800 512 2NO CURRENT 103987627-NOV-15 2.8147E+14

4 1 0 52428800 512 2YES UNUSED 00

SQL > select * fromv$logfile

GROUP# STATUS TYPE MEMBER IS_

3 ONLINE / u01/apps/oracle/oradata/orcl/redo03.log NO

2 ONLINE / u01/apps/oracle/oradata/orcl/redo02.log NO

1 ONLINE / u01/apps/oracle/oradata/orcl/redo01.log NO

4 ONLINE / u01/apps/oracle/oradata/orcl/redo/redo04.log NO

1 INVALID ONLINE / u01/apps/oracle/oradata/orcl/redo/redo011.log NO

2 INVALID ONLINE / u01/apps/oracle/oradata/orcl/redo/redo022.log NO

3 INVALID ONLINE / u01/apps/oracle/oradata/orcl/redo/redo033.log NO

4 INVALID ONLINE / u01/apps/oracle/oradata/orcl/redo/redo044.log NO

SQL > alter systemswitch logfile

Systemaltered.

SQL > /

Systemaltered.

SQL > /

Systemaltered.

SQL > /

Systemaltered.

View log group diversity

SQL > select * fromv$log

GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARCSTATUS FIRST_CHANGE# FIRST_TIME NEXT_CHANGE# NEXT_TIME

-

1 1 14 52428800 512 2YES INACTIVE 104102627-NOV-15 1041029 27-NOV-15

2 1 15 52428800 512 2YES INACTIVE 104102927-NOV-15 1041037 27-NOV-15

3 1 16 52428800 512 2NO CURRENT 104103727-NOV-15 2.8147E+14

41 13 52428800 512 2YES INACTIVE 104100727-NOV-15 1041026 27-NOV-15

SQL > select * fromv$logfile

GROUP# STATUS TYPE MEMBER IS_

3 ONLINE / u01/apps/oracle/oradata/orcl/redo03.log NO

2 ONLINE / u01/apps/oracle/oradata/orcl/redo02.log NO

1 ONLINE / u01/apps/oracle/oradata/orcl/redo01.log NO

4 ONLINE / u01/apps/oracle/oradata/orcl/redo/redo04.log NO

1 ONLINE / u01/apps/oracle/oradata/orcl/redo/redo011.log NO

2 ONLINE / u01/apps/oracle/oradata/orcl/redo/redo022.log NO

3 ONLINE / u01/apps/oracle/oradata/orcl/redo/redo033.log NO

4 ONLINE / u01/apps/oracle/oradata/orcl/redo/redo044.log NO

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