我遇到一个问题，似乎我的数据库中的一些大型表没有被 autovacuum 守护进程清理。这是我所看到的：
SELECT schemaname, relname, n_live_tup, n_dead_tup, last_autovacuum
FROM pg_stat_all_tables
ORDER BY n_dead_tup DESC LIMIT 5;
+------------+-----------------------------+------------+------------+-------------------------------+
| schemaname | relname | n_live_tup | n_dead_tup | last_autovacuum |
+------------+-----------------------------+------------+------------+-------------------------------+
| md | calculation_log_item | 35989527 | 3559253 | 2020-07-13 03:41:37.49764-04 |
| audit | transaction_statement | 700356 | 557278 | NULL |
| audit | record_history | 701635 | 438849 | NULL |
| md | program_requirement_state | 193500 | 29204 | 2020-07-14 03:06:02.339032-04 |
| md | calculation_log …