Hello. Statistics sender logic during usual commit and two-phase commit do not strictly matches each other and that leads to delta_live_tuples added to n_live_tup in case of truncate in two phase commit.
That can be see in following example: CREATE TABLE trunc_stats_test5(id serial); INSERT INTO trunc_stats_test5 DEFAULT VALUES; INSERT INTO trunc_stats_test5 DEFAULT VALUES; INSERT INTO trunc_stats_test5 DEFAULT VALUES; BEGIN; TRUNCATE trunc_stats_test5; PREPARE TRANSACTION 'twophase_stats'; COMMIT PREPARED 'twophase_stats'; After that pg_stat_user_tables will have n_live_tup = 3 instead of 0. Fix along with test is attached.
2pc-stats.patch
Description: Binary data
-- Stas Kelvich Postgres Professional: http://www.postgrespro.com Russian Postgres Company
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