Protect a table against concurrent data changes while allowing to vacuum it

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От Vlad Arkhipov
Тема Protect a table against concurrent data changes while allowing to vacuum it
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Msg-id 576A55EC.3060403@dc.baikal.ru
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Ответы Re: Protect a table against concurrent data changes while allowing to vacuum it
Re: Protect a table against concurrent data changes while allowing to vacuum it
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Hello,

I have a constraint that requires a table to be locked before checking
it (i.e. no more than 2 records with the same value in the same column).
If I lock the table in the SHARE ROW EXCLUSIVE mode, any vacuuming (or
autovacuuming) process prevents me from checking the constraint. What
are possible solutions?

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