Re: dc_sequences

2003-12-31 Thread Ravi Kulkarni 
Ashish,

Are you using NOCACHE/ORDER for your sequences ? If
so, is the cache size for your sequences default (20)?
Try increasing the cache size to see if the misses
reduce.
If these sequences a columns of an Index, it would
affect the cache fusion latencies (hence performance)
since the column is accessed from multiple nodes.
Increasing cache size for sequences (with NOORDER, if
feasible) can yield good results if you have - 
- High "row cache lock" waits in v$system_event;
- High dlm_conflicts in v$rowcache
- High Cum_wait_time for SQ enqueue in v$enqueue_stat

HTH,
Ravi.

--- Ashish Sahasrabudhe
<[EMAIL PROTECTED]> wrote:
> In statspack report on RAC 9.2.0.2 database, under
> section "Dictionary Cache
> Stats for DB"
> there are 64.3% miss for dc_sequences. What causes
> this?
> 
> Thanks
> 


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RE: dc_sequences

2003-12-31 Thread Anjo Kolk 
Title: Message



This 
is most likely a sequence that is incremented from multiple nodes. When a range 
runs out, a node has to allocate a new range. other nodes have to 
flush/invalidate their sequence number tow cache entry.
 
Anjo.

  
  -Original Message-From: 
  [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of 
  Ashish SahasrabudheSent: Monday, December 29, 2003 10:30 
  PMTo: Multiple recipients of list ORACLE-LSubject: 
  dc_sequences
  In statspack report on RAC 9.2.0.2 database, under section 
  "Dictionary Cache Stats for DB" there are 64.3% miss 
  for dc_sequences. What causes this? 
  Thanks

dc_sequences

2003-12-29 Thread Ashish Sahasrabudhe 
Title: dc_sequences





In statspack report on RAC 9.2.0.2 database, under section "Dictionary Cache Stats for DB"
there are 64.3% miss for dc_sequences. What causes this?


Thanks