Re: [PERFORM] how to change the index chosen in plan?

2012-06-10 Thread Rural Hunter
于 2012/6/9 22:39, Kevin Grittner 写道: Rural Hunter wrote: 于 2012/6/9 0:39, Kevin Grittner 写道: name | current_setting full_page_writes | off There may be exceptions on some file systems, but generally turning this off leaves you vulnerable to possible database corruption if you OS or

Re: [PERFORM] pg_dump and thousands of schemas

2012-06-10 Thread Jeff Janes
On Wed, May 30, 2012 at 2:06 AM, Tatsuo Ishii wrote: >> Yeah, Jeff's experiments indicated that the remaining bottleneck is lock >> management in the server.  What I fixed so far on the pg_dump side >> should be enough to let partial dumps run at reasonable speed even if >> the whole database cont

Re: [PERFORM] partitioning performance question

2012-06-10 Thread Robert Klemme
On Sat, Jun 9, 2012 at 7:58 PM, Kevin Kempter wrote: > Hi All; > > We have a client that has a table where large blobs (bytea) are stored. the > table has a key column that is numbers (like 112362) but unfortunately it's > a varchar column so the blobs are accessed via queries like: > > select * f

[PERFORM] Performance of CLUSTER

2012-06-10 Thread Mark Thornton
What is the expected performance of cluster and what tuning parameters have most effect? I have a set of 5 tables with identical structure (all inherit a common table). The sizes given are total relation size. The clustering index is a gist index on a (non null) geographic(linestring) column