Originally in psql-admin, but copied here at the request of Tom to..
Story so far, transaction log archiving went wrong causing the
transaction log disk to fill up. Foolishly i deleted the unarchived
transaction logs (early monday morning) which required a pg_resetxlog to
get the db up and running again. Since then we've had some minor db
corruption which has been fixed (mainly duplicate primary keys) except
for the pg_class table.
If i do a vacuum full on pg_class i get something like this:
INFO: vacuuming "pg_catalog.pg_class"INFO: "pg_class": found 37
removable, 1845 nonremovable row versions in 18905 pages
DETAIL: 27 dead row versions cannot be removed yet.
Nonremovable row versions range from 160 to 229 bytes long.
There were 933834 unused item pointers.
Total free space (including removable row versions) is 150368692 bytes.
18839 pages are or will become empty, including 0 at the end of the table.
0 pages containing 0 free bytes are potential move destinations.
CPU 0.01s/0.05u sec elapsed 0.17 sec.INFO: index "pg_class_oid_index"
now contains 1813 row versions in 7 pages
DETAIL: 56 index row versions were removed.
0 index pages have been deleted, 0 are currently reusable.
CPU 0.00s/0.00u sec elapsed 0.00 sec.INFO: index
"pg_class_relname_nsp_index" now contains 1818 row versions in 24 pages
DETAIL: 63 index row versions were removed.
0 index pages have been deleted, 0 are currently reusable.
CPU 0.00s/0.00u sec elapsed 0.00 sec.WARNING: index
"pg_class_relname_nsp_index" contains 1818 row versions, but table
contains 1813 row versions
HINT: Rebuild the index with REINDEX.INFO: analyzing
"pg_catalog.pg_class"INFO: "pg_class": scanned 3000 of 18905 pages,
containing 227 live rows and 6 dead rows; 227 rows in sample, 1430
estimated total rows
Total query runtime: 4469 ms.
As you can see there are non-removable dead rows (which slowly grows)
and the table size is also increasing in size.. A reindex on the
indexes mentions also succeeds but another vacuum reports the same thing...
In the log files the relevant bits are:
GMT LOG: relation "pg_class" TID 15538/4: dead HOT-updated tuple ---
cannot shrink relation
2009-02-12 21:06:40 GMT STATEMENT: VACUUM FULL VERBOSE ANALYZE pg_class
2009-02-12 21:06:40 GMT WARNING: index "pg_class_relname_nsp_index"
contains 1818 row versions, but table contains 1813 row versions
and finally the last message in the psql-admin thread suggested dumping
the above page, which is attached before.
Hmm. The comments in vacuum.c about this case suppose that it could
only be a transient condition, ie the tuple became dead while we were
looking at the page. Evidently it's persistent for you, which means
that for some reason heap_page_prune() is failing to remove an
already-dead tuple. I suspect this implies a corrupt HOT chain, but
maybe the data is okay and what you've got is really a bug in
heap_page_prune.
Could you send a dump of page 15538 of pg_class, using pg_filedump?
The source code for it is here:
http://sources.redhat.com/rhdb/utilities.html
Best would be -i -f format, ie
pg_filedump -i -f -R 15538 $PGDATA/base/something/1259
regards, tom lane
Any help would be appreciated as the pg_class table is constantly
growing which i'm guessing is going to start to affect performance
fairly soon. I'd like to avoid a full restore from backup if possible.
Thanks
JOHN
*******************************************************************
* PostgreSQL File/Block Formatted Dump Utility - Version 8.3.0
*
* File: /mnt/data/postgresql/8.3/base/16392/1259
* Options used: -i -f -R 15538
*
* Dump created on: Thu Feb 12 22:30:43 2009
*******************************************************************
Block 15538 ********************************************************
<Header> -----
Block Offset: 0x07964000 Offsets: Lower 220 (0x00dc)
Block: Size 8192 Version 4 Upper 5632 (0x1600)
LSN: logid 428 recoff 0xbce5c3a0 Special 8192 (0x2000)
Items: 49 Free Space: 5412
TLI: 0x0001 Prune XID: 0x00000000 Flags: 0x0001 (HAS_FREE_LINES)
Length (including item array): 220
0000: ac010000 a0c3e5bc 01000100 dc000016 ................
0010: 00200420 00000000 00000000 00000000 . . ............
0020: 00000000 609f4001 c09e4001 209e4001 ......@...@. ....@.
0030: 809d4001 e09c4001 00000000 00000000 ....@...@.........
0040: 409c4001 a09b4001 009b4001 609a4001 @....@...@....@.`.@.
0050: c0994001 20994001 80984001 00000000 ....@. ....@...@.....
0060: 00000000 e0974001 40974001 a0964001 ......@.@....@...@.
0070: 00964001 00000000 00000000 00000000 ....@.............
0080: 00000000 00000000 00000000 00000000 ................
0090: 00000000 00000000 00000000 00000000 ................
00a0: 00000000 00000000 00000000 00000000 ................
00b0: 00000000 00000000 00000000 00000000 ................
00c0: 00000000 00000000 00000000 00000000 ................
00d0: 00000000 00000000 00000000 ............
<Data> ------
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Item 2 -- Length: 0 Offset: 0 (0x0000) Flags: UNUSED
Item 3 -- Length: 0 Offset: 0 (0x0000) Flags: UNUSED
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XMIN: 471107346 XMAX: 471107808 CID|XVAC: 0 OID: 187262
Block Id: 15538 linp Index: 5 Attributes: 27 Size: 32
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1f80: 74656d70 5f717565 75650000 00000000 temp_queue......
1f90: 00000000 00000000 00000000 00000000 ................
1fa0: 00000000 00000000 00000000 00000000 ................
1fb0: 00000000 00000000 00000000 00000000 ................
1fc0: 15400000 80db0200 00400000 00000000 ....@.......@......
1fd0: 34974300 00000000 00000000 00000000 4.C.............
1fe0: 00000000 00000000 01007200 03000000 ..........r.....
1ff0: 00000000 00000000 00010000 1287141c ................
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1e60: 00000000 00000000 00000000 00000000 ................
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XMIN: 471108887 XMAX: 471109460 CID|XVAC: 0 OID: 187262
Block Id: 15538 linp Index: 8 Attributes: 27 Size: 32
infomask: 0x2509
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infomask: 0x2509
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Block Id: 15538 linp Index: 12 Attributes: 27 Size: 32
infomask: 0x2509
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1cd0: 00000000 00000000 00010000 ad95141c ................
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Block Id: 15538 linp Index: 13 Attributes: 27 Size: 32
infomask: 0x2509
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1be0: 00000000 00000000 00000000 00000000 ................
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1c10: 5c974300 00000000 00000000 00000000 \.C.............
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1c30: 00000000 00000000 00010000 3897141c ............8...
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XMIN: 471112070 XMAX: 471112509 CID|XVAC: 0 OID: 187262
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1b20: 74656d70 5f717565 75650000 00000000 temp_queue......
1b30: 00000000 00000000 00000000 00000000 ................
1b40: 00000000 00000000 00000000 00000000 ................
1b50: 00000000 00000000 00000000 00000000 ................
1b60: 15400000 80db0200 00400000 00000000 ....@.......@......
1b70: 61974300 00000000 00000000 00000000 a.C.............
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1b90: 00000000 00000000 00010000 7e99141c ............~...
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XMIN: 471112509 XMAX: 471113050 CID|XVAC: 0 OID: 187262
Block Id: 15538 linp Index: 15 Attributes: 27 Size: 32
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1a80: 74656d70 5f717565 75650000 00000000 temp_queue......
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1ad0: 66974300 00000000 00000000 00000000 f.C.............
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XMIN: 471113050 XMAX: 471113635 CID|XVAC: 0 OID: 187262
Block Id: 15538 linp Index: 16 Attributes: 27 Size: 32
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1a50: 00000000 00000000 00010000 5a9d141c ............Z...
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XMIN: 471113635 XMAX: 471114151 CID|XVAC: 0 OID: 187262
Block Id: 15538 linp Index: 17 Attributes: 27 Size: 32
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1950: 00000000 00000000 00000000 00000000 ................
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1970: 00000000 00000000 00000000 00000000 ................
1980: 15400000 80db0200 00400000 00000000 ....@.......@......
1990: 70974300 00000000 00000000 00000000 p.C.............
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XMIN: 471114151 XMAX: 471114646 CID|XVAC: 0 OID: 187262
Block Id: 15538 linp Index: 18 Attributes: 27 Size: 32
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Block Id: 15538 linp Index: 22 Attributes: 27 Size: 32
infomask: 0x2509
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Block Id: 15538 linp Index: 23 Attributes: 27 Size: 32
infomask: 0x2509
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Item 23 -- Length: 160 Offset: 5632 (0x1600) Flags: NORMAL
XMIN: 471117318 XMAX: 0 CID|XVAC: 0 OID: 187262
Block Id: 15538 linp Index: 23 Attributes: 27 Size: 32
infomask: 0x2909
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*** End of Requested Range Encountered. Last Block Read: 15538 ***
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