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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Denis <socsam@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: [HACKERS] pg_dump and thousands of schemas
Date: Tue, 06 Nov 2012 10:07:34 -0500
Message-ID: <13005.1352214454@sss.pgh.pa.us> (raw)
In-Reply-To: <1352211374706-5730864.post@n5.nabble.com>
References: <20120529.185149.1127748531209576379.t-ishii@sraoss.co.jp>
	<12147.1338306742@sss.pgh.pa.us>
	<20120530.180620.600165924826262795.t-ishii@sraoss.co.jp>
	<20120531.092043.1953698679173443322.t-ishii@sraoss.co.jp>
	<20120830204433.GW8753@momjian.us>
	<1086.1346359916@sss.pgh.pa.us>
	<CA+TgmobHksoQmbLyAMB7D5FwqDGA8+u5rooviEuP8rg_zcMzGg@mail.gmail.com>
	<27683.1346383075@sss.pgh.pa.us>
	<CAMkU=1xAUY_aCiWeVL1J5Xrub4vMObWG9UnOQrTR==6z4w1dUw@mail.gmail.com>
	<CA+TgmobHDYs2RoL0P+Fx0-W-f00ziy8M6pE7tSCuDAt8OTyRNg@mail.gmail.com>
	<1352211374706-5730864.post@n5.nabble.com>

Denis <socsam@gmail.com> writes:
> I've read all the posts in thread, and as I understood in version 9.2 some
> patches were applied to improve pg_dump speed. I've just installed
> PostgreSQL 9.2.1 and I still have the same problem. I have a database with
> 2600 schemas in it. I try to dump each schema individually, but it takes too
> much time for every schema (about 30-40 seconds per schema, no matter what
> the data size is).

Could you provide a test case for that?  Maybe the output of pg_dump -s,
anonymized as you see fit?

> Also for each schema dump I have a slow query log entry,

Could you provide EXPLAIN ANALYZE output for that query?

			regards, tom lane




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