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IDS Forum

Re: RE: Long Checkpoints with HDR and 11.5.

Posted By: JACQUES RENAUT
Date: Monday, 15 March 2010, at 3:07 p.m.

In Response To: Re: RE: Long Checkpoints with HDR and 11.5. (Art Kagel)

Art Kagel wrote:
No, Jacques, IDS secondaries do not share buffer pool updates with the
primary. Only the logical log buffers are transferred, so only the server's
transaction rate would affect the data transfer rate between the servers and
that would be about the same regardless of the LRU_MIN/MAX_DIRTY settings.
Now changing the size of the logical log buffer on the other hand, would
have some effect, but minor, and the discrepancy between the number of CPU
VPs on the two servers will have a much bigger effect.
Art
Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Reply:
No the secondaries do not share buffer pools, however, as log records are applied on the secondary, they mark buffers as dirty, and as part of the checkpoint processing (ie when the secondary gets the logical log record of the checkpoint from the primary) the secondary is required to flush the buffer pool. Sorry if I was unclear in my first post, but trust me, I know what I'm talking about as I entered the defect. The way this buffer pool flush is done on the secondary can indeed hold up the primary. What you would see if user threads waiting on the log buff condition and you would see the dr_prsend thread waiting on the drcb_bqe condition. Now you can see that for other reasons as well, but one reason is cause due to large buffer pool flushing on the secondary. Please refer to APAR IC60754.
Jacques Renaut
IBM Informix Advanced Support
APD Team

Messages In This Thread

RE: Long Checkpoints with HDR and 11.5.
Knox, Ernest -- Monday, 15 March 2010, at 1:01 p.m.
- RE: Long Checkpoints with HDR and 11.5.
  Madison Pruet -- Monday, 15 March 2010, at 1:07 p.m.
  - RE: Long Checkpoints with HDR and 11.5.
    Knox, Ernest -- Monday, 15 March 2010, at 1:41 p.m.
    - RE: Long Checkpoints with HDR and 11.5.
      Madison Pruet -- Monday, 15 March 2010, at 2:33 p.m.
- Re: RE: Long Checkpoints with HDR and 11.5.
  JACQUES RENAUT -- Monday, 15 March 2010, at 2:03 p.m.
  - Re: RE: Long Checkpoints with HDR and 11.5.
    Art Kagel -- Monday, 15 March 2010, at 2:29 p.m.
    - Re: RE: Long Checkpoints with HDR and 11.5.
      JACQUES RENAUT -- Monday, 15 March 2010, at 3:07 p.m.
      - RE: RE: Long Checkpoints with HDR and 11.5.
        Knox, Ernest -- Tuesday, 16 March 2010, at 4:44 p.m.
        
        Re: RE: RE: Long Checkpoints with HDR and 11.5.
        JACQUES RENAUT -- Tuesday, 16 March 2010, at 5:21 p.m.
        
        Re: RE: RE: Long Checkpoints with HDR and 11.5.
        Madison Pruet -- Tuesday, 16 March 2010, at 7:23 p.m.
        
        RE: RE: RE: Long Checkpoints with HDR and 11.5.
        Knox, Ernest -- Tuesday, 16 March 2010, at 11:44 p.m.
  - Re: RE: Long Checkpoints with HDR and 11.5.
    Madison Pruet -- Monday, 15 March 2010, at 2:34 p.m.

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