In this article, I will talk about how to resize redo log files in Oracle.
1. We list the redo logs.
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SQL> select g.group#,g.member,l.bytes/1024/1024 "Size_MB",l.status from v$log l,v$logfile g where l.group# = g.group# order by 1,2; GROUP#|MEMBER |Size_MB |STATUS -----|-----------------------------------|----------|---------- 1|/u01/app/oracle/testdb/redo01.log | 50|INACTIVE 2|/u01/app/oracle/testdb/redo02.log | 50|CURRENT 3|/u01/app/oracle/testdb/redo03.log | 50|INACTIVE 4|/u01/app/oracle/testdb/redo04.log | 50|UNUSED |
2. Currently redolog sizes are 50MB. In order to increase the redolog size to 100MB, we first drop the INACTIVE groups.
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SQL> alter database drop logfile group 1; SQL> alter database drop logfile group 3; |
3. We also delete the Redo Log files through the operating system.
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testdb /u01/app/oracle/testdb> rm redo01.log redo03.log |
4. After the INACTIVE groups are dropped, we list them again.
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SQL> select g.group#,g.member,l.bytes/1024/1024 "Size_MB",l.status from v$log l,v$logfile g where l.group# = g.group# order by 1,2; GROUP#|MEMBER |Size_MB |STATUS -----|-----------------------------------|----------|---------- 2|/u01/app/oracle/testdb/redo02.log | 50|CURRENT 4|/u01/app/oracle/testdb/redo04.log | 50|UNUSED |
5. We increase the size of the dropped redo log files to 100MB.
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SQL> alter database add logfile group 1 '/u01/app/oracle/testdb/redo01.log' size 100M; SQL> alter database add logfile group 3 '/u01/app/oracle/testdb/redo03.log' size 100M; |
It is listed again.
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SQL> select g.group#,g.member,l.bytes/1024/1024 "Size_MB",l.status from v$log l,v$logfile g where l.group# = g.group# order by 1,2; GROUP#|MEMBER |Size_MB |STATUS -----|-----------------------------------|----------|---------- 1|/u01/app/oracle/testdb/redo01.log | 100|UNUSED 2|/u01/app/oracle/testdb/redo02.log | 50|CURRENT 3|/u01/app/oracle/testdb/redo03.log | 100|UNUSED 4|/u01/app/oracle/testdb/redo04.log | 50|UNUSED |
6. We make a log switch to activate the groups in UNUSED state.
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SQL> alter system switch logfile; SQL> select g.group#,g.member,l.bytes/1024/1024 "Size_MB",l.status from v$log l,v$logfile g where l.group# = g.group# order by 1,2; GROUP#|MEMBER |Size_MB |STATUS -----|-----------------------------------|----------|---------- 1|/u01/app/oracle/testdb/redo01.log | 100|ACTIVE 2|/u01/app/oracle/testdb/redo02.log | 50|ACTIVE 3|/u01/app/oracle/testdb/redo03.log | 100|ACTIVE 4|/u01/app/oracle/testdb/redo04.log | 50|CURRENT |
