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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Recommended number of redo log switches per hour
Nothing wrong with 1 GB or ever larger redo log files. Search Usenet at
google for what "HJR" and others have to say on the subject. Howard Rogers
(HJR) recommends one switch per day (manually) if possible and not more than
once per hour. This is all to limit when a checkpoint actually occurs. Of
course this means you better make sure you have your redo logs mirrored and
multiplexed and instance recovery could be significant.
-----Original Message-----
Sent: Thursday, March 14, 2002 9:04 AM
To: Multiple recipients of list ORACLE-L
In my opinion not less than 5-10 minutes in very busy times.
-----Original Message-----
Sent: Thursday, March 14, 2002 8:19 AM
To: Multiple recipients of list ORACLE-L
An Oracle Support technician recommended that I try to aim for three log switches per hour, during busy times.
According to the throughput I got yesterday between 3 and 4 o'clock PM, my redo log files would each have to be 1G in size.
That seems much too large to me, and I am not even sure it is possible to create redo log files that size. Under Oracle 7.3. the largest I could create on Tru64 UNIX 4.0g was 40M redo log files.
Is this another "rule of thumb" that should go down the drain?
Regards,
Patrice Boivin
Systems Analyst (Oracle Certified DBA)
Systems Admin & Operations | Admin. et Exploit. des systèmes Technology Services | Services technologiques Informatics Branch | Direction de l'informatique Maritimes Region, DFO | Région des Maritimes, MPO
E-Mail: boivinp_at_mar.dfo-mpo.gc.ca
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