On Tue, May 02, 2006 at 05:00:58PM +0200, Zeugswetter Andreas DCP SD wrote: > > > I'm planning on continuing to increase XLOG_BLCKSZ and wal_buffers to > > determine when the throughput starts to level out or drop > > I think for an even better comparison you should scale wal_buffers > down with increasing XLOG_BLCKSZ, so that the xlog buffer has a fixed > size in kb. > > Reasonable wal_buffers imho amount to at least 256kb, better yet 512 or > 1 Mb, > with sufficiently large transactions (and to try to factor out the > difference > between blocksizes).
AFAIK all the transactions in DBT2 are pretty small. I think all DML is single-row in fact, so I'm not sure that having wal_buffers much larger than the number of connections would help much. -- Jim C. Nasby, Sr. Engineering Consultant [EMAIL PROTECTED] Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461 ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
