Re: Transactions to create pg_multixact members and offsets

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От Alvaro Herrera
Тема Re: Transactions to create pg_multixact members and offsets
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Msg-id 20141120174556.GK1639@alvin.alvh.no-ip.org
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Ответ на Transactions to create pg_multixact members and offsets  (Dev Kumkar <devdas.kumkar@gmail.com>)
Ответы Re: Transactions to create pg_multixact members and offsets  (Dev Kumkar <devdas.kumkar@gmail.com>)
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Dev Kumkar wrote:
> Hellos,
>
> How to manually increase pg_multixact members and offsets?

Search for "burnmulti" in the archives, which is a contrib module to
test pg_multixact.

> Does a transaction waiting for exclusive lock or shared lock result into
> entry being created in pg_multixact?

Merely waiting does not, but more than one lock being acquired on a
tuple does cause a multixact to be created.  Try SELECT FOR SHARE on two
transactions on the same tuple.

--
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services


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