Re: Does PostgreSQL check database integrity at startup?

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От Pavel Stehule
Тема Re: Does PostgreSQL check database integrity at startup?
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Msg-id CAFj8pRD+FStVDHV19nsbRVSkdk_0bKX=guFW3BD68Z0t5igsVQ@mail.gmail.com
обсуждение исходный текст
Ответ на Re: Does PostgreSQL check database integrity at startup?  (Martin Marques <martin.marques@2ndquadrant.com>)
Ответы Re: Does PostgreSQL check database integrity at startup?  (Edson Carlos Ericksson Richter <richter@simkorp.com.br>)
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2017-12-26 14:44 GMT+01:00 Martin Marques <martin.marques@2ndquadrant.com>:
El 26/12/17 a las 09:52, Edson Carlos Ericksson Richter escribió:
> Recently I had a problem with a base file with size 0 in a standby server.
>
> This raised one question: does PostgreSQL (9.6.6) check base integrity
> at startup?
>
> At least if there are 0 byte size files in base dir? Or CRC? Something?

Yes it has CRC check, but only if you initialize the cluster with
--data-checksums, and there's a price to pay in performance.


It has CRC check, but it is used in runtime - when data are necessary

So Postgres usually check nothing on start - few system tables and indexes

Regards

Pavel

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


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