Oracle10g add or delete a log Group

This is actually a common error. Generally, it is because when the log is fully written, the log group will be switched, and a checkpoint will be triggered at this time. DBWR will dirty the memory.

This is actually a common error. Generally, it is because when the log is fully written, the log group will be switched, and a checkpoint will be triggered at this time. DBWR will dirty the memory.

This error was found in the alert Log during routine inspection.

Thread 1 cannot allocate new log, sequence 319708

Checkpoint not complete

This is actually a common error. Generally, the reason is that when the log is fully written, the log group will be switched. At this time, a checkpoint will be triggered, and DBWR will write dirty blocks in the memory to the data file, this log Group will not be released as long as it is not completed. If the archive mode is enabled, the archive write process of ARCH is also involved. If the redo log is generated too fast, when CPK or archiving is not completed, LGWR has filled the remaining log groups and needs to write redo logs into the current log group, in this case, a conflict occurs and the database is suspended. The preceding error message is always written to alert. log.

Oracle provides the following suggestions:

Add additional log group

Increase size of redo logs

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Select * from v $ log;

Select bytes/1024/1024 from v $ log;

Select * from v $ logfile;

# Use the preceding command to view the status of the log group and Log File

# Add 3 new log groups

Alter database add logfile group 4'/u01/app/oradata/destdb/redo04.log 'size 300 m;

Alter database add logfile group 5'/u01/app/oradata/destdb/redo05.log 'size 300 m;

Alter database add logfile group 6'/u01/app/oradata/destdb/redo06.log 'size 300 m;

# Run the following command to change the status of the newly added log group to "non-unused" and switch the log group to "unused"

Alter system switch logfile;

# Delete the old log group. When adding a log group online, you can only delete the INACTIVE log group when deleting the log group.

Alter database drop logfile group 1;

Alter database drop logfile group 2;

Alter database drop logfile group 3;

# Delete the physical files of the old log group on the OS

Delete/u01/app/oradata/destdb/redo01, 02, 03.log

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