[PATCH] Allow transaction to partition table using FDW
Hi, I would like to use transactions with partitioning table using FDW, but transactions can not be used with the following error. 'ERROR: could not serialize access due to concurrent update So, I tried to write a very simple patch. This patch works for my purpose, but I do not know if it matches general usage. I'd like to improve this feature which can be used generally, so please check it. Please find attached file. Regards, -- mitani allow-transaction-to-partition-table-using-FDW.patch Description: Binary data
Re: [PATCH] Allow transaction to partition table using FDW
Hi there, I modified my patch in response to Ishii-san's pointed out. I always set 'COMMITTED READ' to SQL in 'begin_remote_xact()', but changed to set it only when 'XactIsoLevel' == 'XACT_READ_COMMITTED'. I tested transaction query to partition tables on remote servers as follows, (sent BEGIN - UPDATE - COMMIT query in two sessions) target record on the same server target record on a different server target table is same (wait)(wait) target table is defferent (no wait) (no wait) (wait): Session 2 is kept waiting until session 1 commits (no wait): Session 2 can be committed before session 1 commits I do not understand FDW's design philosophy, so please let me know if there is a problem with my patch. The target version of PostgreSQL is 11.2, and target file of this patch is 'contrib/postgresql/connection.c'. Regards, -- mitani 002-allow-transaction-to-partition-table-using-FDW.patch Description: Binary data fdw-test-case.pdf Description: Adobe PDF document
