Re: Log file synch / direct path writes

> result of a overly large redo log buffer.

How large is it?

> How can I be sure that the [direct path write] waits
> are being caused by DBWR and not LGWR?

In v$session_wait, for the "direct path write" wait event P1 is the file number. Waits for DBWR will be associated with a different set of files than waits for LGWR.

Set up a loop to query v$session_wait every 5 seconds -- INSERT INTO test_table SELECT P1 FROM v$session_wait WHERE wait equals "direct path write". Let it run for a while to collect values of P1 for this wait event into your test table. Then SELECT from the test table, doing a group by and count(*), so you can see which files are involved with these waits.

-- 
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-- 
Author: Greg Moore
  INET: sqlgreg_at_pacbell.net

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