On Tue, Jun 8, 2010 at 11:14 PM, Greg Smith g...@2ndquadrant.com wrote:
Greg Smith wrote:
You don't much with a single snapshot of pg_stat_bgwriter data. Try
saving this instead:
select *,now() from pg_stat_bgwriter;
And then take another snapshot at least a few hours later, preferably the
Scott Marlowe wrote:
-Average checkpoint frequency
-Average size of each checkpoint
-Average rate at which new buffers are allocated
-Average rate of writes out of the buffer cache
-Percentage of writes done by checkpoints, the background writer LRU
cleaner, and client backends
I think
Greg Smith, 09.06.2010 07:14:
I probably should have explained the next part. I've now shared what I
do with this information at
http://www.pgcon.org/2010/schedule/events/218.en.html
Basically, if you put the data from the two snapshots into one of the
Statistics Spreadsheet versions, you'll
Thomas Kellerer wrote:
I don't think we have a caching issue though, it's just one (regular)
bulk import that does some heavy writes which we need to tune. Read
performance is absolutely fine, but everything around vacuum and
checkpointing seems to slow down the import massively.
So would
Hi,
I'm trying to understand the information shown in pg_stat_bgwriter.
If I want to identify a possible bottleneck with the bgwriter, for what kind of
numbers do I need to watch out?
Are the following values OK, or do they indicate that I need to tune my
configuration?
checkpoints_timed :
Thomas Kellerer wrote:
If I want to identify a possible bottleneck with the bgwriter, for
what kind of numbers do I need to watch out?
You don't much with a single snapshot of pg_stat_bgwriter data. Try
saving this instead:
select *,now() from pg_stat_bgwriter;
And then take another
Greg Smith wrote on 08.06.2010 19:30:
Thomas Kellerer wrote:
If I want to identify a possible bottleneck with the bgwriter, for
what kind of numbers do I need to watch out?
You don't much with a single snapshot of pg_stat_bgwriter data. Try
saving this instead:
select *,now() from
Greg Smith wrote:
You don't much with a single snapshot of pg_stat_bgwriter data. Try
saving this instead:
select *,now() from pg_stat_bgwriter;
And then take another snapshot at least a few hours later, preferably
the next day. With two snapshots and timestamps on them, then it's
possible
