Re: pg_dump without explicit table locking

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On 03/17/2014 04:15 PM, Tom Lane wrote:
> Jim Nasby <jim@nasby.net> writes:
>> On 3/17/14, 8:47 AM, Tom Lane wrote:
>>> (Note that this is only one of assorted O(N^2) behaviors in
>>> older versions of pg_dump; we've gradually stamped them out
>>> over time.)
> 
>> On that note, it's recommended that when you are taking a backup
>> to restore into a newer version of Postgres you create the dump
>> using the NEWER version of pg_dump, not the old one.
> 
> Right.  IIRC, the OP said he *did* use a recent pg_dump ... but
> this particular issue got fixed server-side, so the new pg_dump
> didn't help against an 8.1 server :-(

Exactly. I backported the patch from 9.3 to 8.4 and saw a schema-only
dump time go from <give-up-and-kill-it-after-5-days> to 1 hour. This
was for a database with about 500k tables.

Joe

- -- 
Joe Conway
credativ LLC: http://www.credativ.us
Linux, PostgreSQL, and general Open Source
Training, Service, Consulting, & 24x7 Support
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