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Re: ALTER TABLE .. DETACH PARTITION CONCURRENTLY - Mailing list pgsql-hackers

From Pavel Luzanov
Subject Re: ALTER TABLE .. DETACH PARTITION CONCURRENTLY
Date
Msg-id 0688e7c3-8bc8-a3e4-9d8e-3bcbbf3e1f4d@postgrespro.ru
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In response to Re: ALTER TABLE .. DETACH PARTITION CONCURRENTLY  (Amit Langote <amitlangote09@gmail.com>)
Responses Re: ALTER TABLE .. DETACH PARTITION CONCURRENTLY
Re: ALTER TABLE .. DETACH PARTITION CONCURRENTLY
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Hello,

I found this in the documentation, section '5.11.3. Partitioning Using Inheritance'[1]:
"Some operations require a stronger lock when using declarative partitioning than when using table inheritance. For example, removing a partition from a partitioned table requires taking an ACCESS EXCLUSIVE lock on the parent table, whereas a SHARE UPDATE EXCLUSIVE lock is enough in the case of regular inheritance."

This point is no longer valid with some restrictions. If the table has a default partition, then removing a partition still requires taking an ACCESS EXCLUSIVE lock.

May be make sense to add some details about DETACH CONCURRENTLY to the section '5.11.2.2. Partition Maintenance' and completely remove this point?

1. https://www.postgresql.org/docs/devel/ddl-partitioning.html#DDL-PARTITIONING-USING-INHERITANCE
 
Pavel Luzanov
Postgres Professional: https://postgrespro.com
The Russian Postgres Company

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