Oracle-L: RE: how to force a log switch

From: Andrey Bronfin <andreyb_at_elrontelesoft.com>
Date: Sun, 18 Aug 2002 06:53:20 -0800
Message-ID: <F001.004B8695.20020818065320@fatcity.com>

Ron , thanks a lot !
I know this solution , but:
there are certain pick-times when there are many activities going on against the DB. Therefore making the redo logs smaller will cause performance problems. So , i'd have this solution as a last resort, in case i will not find an init.ora solution.
Thanks again !

DBAndrey

03-9254520
058-548133
mailto:andreyb_at_elrontelesoft.com

-----Original Message-----
Sent: Sunday, August 18, 2002 3:14 PM
To: 'Andrey Bronfin'; 'LazyDBA.com Discussion'

The answer pretty simple - change the size of your logs. Log switching is a function of transaction volume. The fewer the transactions, the fewer the log switches. Consider that logs only switch when they are filled (or manually). So ,if there are insufficient transactions to fill your logs in 3 minutes, make your logs smaller. If your logs are switching every 10 minutes now, then create new logs that are 1/3 the size.

Having said all that, the other thing you could do is create a dbms_job that runs every three minutes and forces a log switch. It's not as pretty as right-sizing your logs, but it works.

R/
Ron Gawer

-----Original Message-----
Sent: Sunday, August 18, 2002 10:03 AM
To: LazyDBA.com Discussion

Dear gurus !
It's either a Sunday's dead brain or ...... Is there an init.ora parameter to force redo logs switch every 3 minutes or so ? ( the reason is that I need frequent log switches in order for the standby database to pickup changes frequently , i.e. to be "almost" in sync with the primary DB. And, off course, issuing "alter system switch logfile" in the application is not feasible ) Now, i only found parameters related to the frequency of the CHECKPOINTs and not log switches. Any help , please ...

DBAndrey

03-9254520
058-548133
mailto:andreyb_at_elrontelesoft.com

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Author: Andrey Bronfin
  INET: andreyb_at_elrontelesoft.com

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Received on Sun Aug 18 2002 - 09:53:20 CDT