RE: Required locks for ANALYZE

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От Aramaki Zyake
Тема RE: Required locks for ANALYZE
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Msg-id 5d91b2f1.1c69fb81.bf75c.2036@mx.google.com
обсуждение исходный текст
Ответ на Re: Required locks for ANALYZE  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Required locks for ANALYZE  (Bruce Momjian <bruce@momjian.us>)
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Hi,

I’m terribly sorry for the delay of response.

 

>This does not really seem like an improvement.  The second formulation is

>pedantically correct, but also unintelligible.

> Maybe we could make it say "run in parallel with non-DDL activity" ?

 

I completely agree with you, therefore, I amended it as follows.

----

ANALYZE requires only a read lock on the target table, so it can run in

parallel with non-DDL activity on the table.

----

 

Would it be possible to proceed further?


Best regards

 

 

From: Tom Lane
Sent: Tuesday, August 20, 2019 11:12 PM
To: zyake.mk4@gmail.com
Cc: pgsql-docs@lists.postgresql.org
Subject: Re: Required locks for ANALYZE

 

PG Doc comments form <noreply@postgresql.org> writes:

> Therefore, in my opinion, the below paragraph should be amended as below.

 

> * Before

> -----

> ANALYZE requires only a read lock on the target table, so it can run in

> parallel with other activity on the table.

> -----

 

> * After

> -----

> ANALYZE requires only a SHARE UPDATE EXCLUSIVE lock on the target table, so

> it can run in parallel with queries requiring ACCESS SHARE/ROW SHARE/ROW

> EXCLUSIVE locks such as SELECT, UPDATE, DELETE, INSERT on the table.

> -----

 

This does not really seem like an improvement.  The second formulation is

pedantically correct, but also unintelligible.

 

Maybe we could make it say "run in parallel with non-DDL activity" ?

 

                                         regards, tom lane

 

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