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Don Burleson Blog 







Monitoring REDO Log Buffer Tips

Oracle Database Tips by Donald BurlesonFebruary 21, 2015

Question:  How do I monitor my redo log buffer in Oracle?

Answer:  The Oracle redo log buffer is a small area of RAM where updates (DML) are processed for roll-forward and flashback functionality.

For related redo tuning notes, see here for details on optimal redo log_buffer sizing, and here for overall redo log tuning tips. For the whole story, see my book "Oracle Tuning: The Definitive Reference".

Starting in release 10.2 and beyond, Oracle will automatically size the log_buffer on your behalf and log_buffer cannot be changed dynamically. The automatic log_buffer sizing is based on the granule size (as determined by the hidden parameter _ksmg_granule_size):

   a.ksppinm name,
   b.ksppstvl value,
   a.ksppdesc description
   x$ksppi a,
   x$ksppcv b
   a.indx = b.indx
   a.ksppinm = '_ksmg_granule_size';

------------------------------ ------------------------------ ----------------
_ksmg_granule_size 16777216 granule size in bytes

For more information on the monitoring the redo log buffer, see my notes on redo log buffer management.

For more notes on optimizing your Oracle redo log buffer size, click here.

For complete scripts to monitor the redo log buffer, download the Oracle script collection.

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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