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Hi, I'm observing a performance degradation in executeBatch case when upgrading 9.3-1102.jdbc41 -> 9.4-1203. 1102 -- 0.78 sec / executeBatch 1203 -- 1.8 sec / executeBatch It looks like the degradation is caused by the fact that two "flag" constants share the same value: QUERY_FORCE_DESCRIBE_PORTAL = 128; and QUERY_DISALLOW_BATCHING = 128; https://github.com/pgjdbc/pgjdbc/commit/a6bd36faaedc779f932fa76f52bab9550f0fcd6d#diff-54e833c3fd25410b800ff28a1e189227R97 https://github.com/pgjdbc/pgjdbc/commit/a6bd36faaedc779f932fa76f52bab9550f0fcd6d#diff-54e833c3fd25410b800ff28a1e189227R106 Profiling shows that 1203 does QueryExecutorImpl.flushIfDeadlockRisk -> sendSync a lot. I wonder if reusing 128 was intentional or not. I'll try modifying QUERY_FORCE_DESCRIBE_PORTAL=512 to see if that helps. -- Regards, Vladimir Sitnikov
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