Hello, Our pg_multixact directory keeps growing. I did a "vacuum freeze” which didn’t help. I also did a "vacuum full” which didn’t help either. We had this condition with 9.3.4 as well. When I upgraded our cluster to 9.4.5 (via plain sql dump and load) as expected the issue was resolved but now it’s happening again. Luckily it has no ill effect other than consuming 4G of space for an otherwise 1G database. Can you offer any hints as to how I can cure this? thanks, Kiriakos Georgiou pg_controldata output: pg_control version number: 942 Catalog version number: 201409291 Database system identifier: 6211781659140720513 Database cluster state: in production pg_control last modified: Wed Feb 10 13:45:02 2016 Latest checkpoint location: D/FB5FE630 Prior checkpoint location: D/FB5FE558 Latest checkpoint's REDO location: D/FB5FE5F8 Latest checkpoint's REDO WAL file: 000000010000000D000000FB Latest checkpoint's TimeLineID: 1 Latest checkpoint's PrevTimeLineID: 1 Latest checkpoint's full_page_writes: on Latest checkpoint's NextXID: 0/3556219 Latest checkpoint's NextOID: 2227252 Latest checkpoint's NextMultiXactId: 2316566 Latest checkpoint's NextMultiOffset: 823062151 Latest checkpoint's oldestXID: 668 Latest checkpoint's oldestXID's DB: 1 Latest checkpoint's oldestActiveXID: 3556219 Latest checkpoint's oldestMultiXid: 1 Latest checkpoint's oldestMulti's DB: 1 Time of latest checkpoint: Wed Feb 10 13:45:02 2016 Fake LSN counter for unlogged rels: 0/1 Minimum recovery ending location: 0/0 Min recovery ending loc's timeline: 0 Backup start location: 0/0 Backup end location: 0/0 End-of-backup record required: no Current wal_level setting: hot_standby Current wal_log_hints setting: off Current max_connections setting: 100 Current max_worker_processes setting: 8 Current max_prepared_xacts setting: 0 Current max_locks_per_xact setting: 1024 Maximum data alignment: 8 Database block size: 8192 Blocks per segment of large relation: 131072 WAL block size: 8192 Bytes per WAL segment: 16777216 Maximum length of identifiers: 64 Maximum columns in an index: 32 Maximum size of a TOAST chunk: 1996 Size of a large-object chunk: 2048 Date/time type storage: 64-bit integers Float4 argument passing: by value Float8 argument passing: by value Data page checksum version: 0 the offsets directory: -rw------- 1 postgres dba 262144 Nov 3 15:22 0000 -rw------- 1 postgres dba 262144 Nov 5 12:45 0001 -rw------- 1 postgres dba 262144 Nov 9 14:25 0002 -rw------- 1 postgres dba 262144 Nov 13 10:10 0003 -rw------- 1 postgres dba 262144 Nov 16 15:40 0004 -rw------- 1 postgres dba 262144 Nov 20 09:55 0005 -rw------- 1 postgres dba 262144 Dec 1 08:00 0006 -rw------- 1 postgres dba 262144 Dec 9 11:50 0007 -rw------- 1 postgres dba 262144 Dec 16 08:14 0008 -rw------- 1 postgres dba 262144 Dec 21 09:40 0009 -rw------- 1 postgres dba 262144 Dec 31 09:55 000A -rw------- 1 postgres dba 262144 Jan 4 21:17 000B -rw------- 1 postgres dba 262144 Jan 6 10:50 000C -rw------- 1 postgres dba 262144 Jan 7 18:20 000D -rw------- 1 postgres dba 262144 Jan 13 13:55 000E -rw------- 1 postgres dba 262144 Jan 15 11:55 000F -rw------- 1 postgres dba 262144 Jan 22 07:50 0010 -rw------- 1 postgres dba 262144 Jan 26 16:35 0011 -rw------- 1 postgres dba 262144 Jan 29 10:16 0012 -rw------- 1 postgres dba 262144 Feb 3 13:17 0013 -rw------- 1 postgres dba 262144 Feb 3 16:13 0014 -rw------- 1 postgres dba 262144 Feb 4 08:24 0015 -rw------- 1 postgres dba 262144 Feb 5 13:20 0016 -rw------- 1 postgres dba 262144 Feb 8 11:26 0017 -rw------- 1 postgres dba 262144 Feb 8 11:46 0018 -rw------- 1 postgres dba 262144 Feb 8 12:25 0019 -rw------- 1 postgres dba 262144 Feb 8 13:19 001A -rw------- 1 postgres dba 262144 Feb 8 14:23 001B -rw------- 1 postgres dba 262144 Feb 8 15:32 001C -rw------- 1 postgres dba 262144 Feb 8 17:01 001D -rw------- 1 postgres dba 262144 Feb 8 19:19 001E -rw------- 1 postgres dba 262144 Feb 8 22:11 001F -rw------- 1 postgres dba 262144 Feb 9 01:44 0020 -rw------- 1 postgres dba 262144 Feb 9 05:57 0021 -rw------- 1 postgres dba 262144 Feb 9 10:45 0022 -rw------- 1 postgres dba 98304 Feb 10 13:35 0023 the members directory has 15723 files: ls -l|wc -l 15723 |