From: Tom Lane <tgl@sss.pgh.pa.us>
To: ROHIT SACHDEVA <sachdeva.rohit648@gmail.com>
Cc: pgsql-admin@lists.postgresql.org
Subject: Re: Related To Hash Partition
Date: Sun, 23 Apr 2023 11:07:34 -0400
Message-ID: <3840294.1682262454@sss.pgh.pa.us> (raw)
In-Reply-To: <CAKDb7aHVoBa-C-EABeBZhgndZWtNqoZ1feOO3S9A6qLbyH8tMA@mail.gmail.com>
References: <CAKDb7aHVoBa-C-EABeBZhgndZWtNqoZ1feOO3S9A6qLbyH8tMA@mail.gmail.com>
ROHIT SACHDEVA <sachdeva.rohit648@gmail.com> writes:
> While using hash partition i am facing the problem that the data is not
> going into the proper partition table .
Define "proper". It's generally best to assume that the hash function
is a black box --- if you assume you know which partition a given key
value will be mapped to, you are doing something very fragile, and people
will have no sympathy for you when it breaks.
If you want a predictable mapping, use list or range partitioning,
not hash.
regards, tom lane
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Subject: Re: Related To Hash Partition
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