Re: [HACKERS] Race between SELECT and ALTER TABLE NO INHERIT

On 2017/09/13 12:05, Simon Riggs wrote:
> On 26 June 2017 at 10:16, Amit Langote <Langote_Amit_f8@lab.ntt.co.jp> wrote:
> 
>> BTW, in the partitioned table case, the parent is always locked first
>> using an AccessExclusiveLock.  There are other considerations in that case
>> such as needing to recreate the partition descriptor upon termination of
>> inheritance (both the DETACH PARTITION and also DROP TABLE child cases).
> 
> Is this requirement documented or in comments anywhere?

Yes.  See the last sentence in the description of PARTITION OF clause in
CREATE TABLE:

https://www.postgresql.org/docs/devel/static/sql-createtable.html#sql-createtable-partition

And, the 4th point in the list of differences between declarative
partitioning and inheritance:

https://www.postgresql.org/docs/devel/static/ddl-partitioning.html#ddl-partitioning-implementation-inheritance

Thanks,
Amit



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