One possibility is to drop all the indexes, do the insert and re-add the
The more indexes that exist and the more rows that exist, the more costly
At 05:48 PM 9/24/2003 +1200, peter wrote:
>I have been trying to get my Postgres database to do faster inserts.
>The environment is basically a single user situation.
>The part that I would like to speed up is when a User copys a Project.
>A Project consists of a number of Rooms(say 60). Each room contains a
>number of items.
>A project will contain say 20,000 records.
>Anyway the copying process gets slower and slower, as more projects are
>added to the database.
>My statistics(Athlon 1.8Ghz)
>20,000 items Takes on average 0.078seconds/room
>385,000 items Takes on average .11seconds/room
>690,000 items takes on average .270seconds/room
>1,028,000 items Takes on average .475seconds/room
>As can be seen the time taken to process each room increases. A commit
>occurs when a room has been copied.
>The hard drive is not being driven very hard. The hard drive light only
>flashes about twice a second when there are a million records in the database.
>I thought that the problem could have been my plpgsql procedure because I
>assume the code is interpreted.
>However I have just rewriten the code using straight sql(with some temp
>and the times turn out to be almost exactly the same as the plpgsql version.
>The read speed for the Application is fine. The sql planner seems to be
>doing a good job. There has been only one problem
>that I have found with one huge select, which was fixed by a cross join.
> I am running Red hat 8. Some of my conf entries that I have changed follow
>shared_buffers = 3700
>effective_cache_size = 4000
>sort_mem = 32168
>Are the increasing times reasonable?
>The times themselves might look slow, but thats because there are a number
>of tables involved in a Copy
>I can increase the shared buffer sizes above 32M, but would this really help?
>---------------------------(end of broadcast)---------------------------
>TIP 4: Don't 'kill -9' the postmaster
In response to
pgsql-performance by date
|Next:||From: Matt Clark||Date: 2003-09-24 17:35:34|
|Subject: Re: Index problem|
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|Subject: Re: Performance issue|