Database corruption help

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От John Lister
Тема Database corruption help
Дата
Msg-id 49952D33.3000707@kickstone.com
обсуждение исходный текст
Ответ на Re: [ADMIN] database corruption help  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Database corruption help
Re: Database corruption help
Re: Database corruption help
Список pgsql-hackers
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
 Item   4 -- Length:  160  Offset: 8032 (0x1f60)  Flags: NORMAL
  XMIN: 471107346  XMAX: 471107808  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 5   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1f60: 1287141c e088141c 00000000 0000b23c  ...............<
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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  ................
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  1fd0: 34974300 00000000 00000000 00000000  4.C.............
  1fe0: 00000000 00000000 01007200 03000000  ..........r.....
  1ff0: 00000000 00000000 00010000 1287141c  ................

 Item   5 -- Length:  160  Offset: 7872 (0x1ec0)  Flags: NORMAL
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  Block Id: 15538  linp Index: 6   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1ec0: e088141c a08a141c 00000000 0000b23c  ...............<
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  1f30: 39974300 00000000 00000000 00000000  9.C.............
  1f40: 00000000 00000000 01007200 03000000  ..........r.....
  1f50: 00000000 00000000 00010000 de88141c  ................

 Item   6 -- Length:  160  Offset: 7712 (0x1e20)  Flags: NORMAL
  XMIN: 471108256  XMAX: 471108887  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 7   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1e20: a08a141c 178d141c 00000000 0000b23c  ...............<
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  1e40: 74656d70 5f717565 75650000 00000000  temp_queue......
  1e50: 00000000 00000000 00000000 00000000  ................
  1e60: 00000000 00000000 00000000 00000000  ................
  1e70: 00000000 00000000 00000000 00000000  ................
  1e80: 15400000 80db0200 00400000 00000000  .@.......@......
  1e90: 3e974300 00000000 00000000 00000000  >.C.............
  1ea0: 00000000 00000000 01007200 03000000  ..........r.....
  1eb0: 00000000 00000000 00010000 9f8a141c  ................

 Item   7 -- Length:  160  Offset: 7552 (0x1d80)  Flags: NORMAL
  XMIN: 471108887  XMAX: 471109460  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 8   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1d80: 178d141c 548f141c 00000000 0000b23c  ....T..........<
  1d90: 08001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  1da0: 74656d70 5f717565 75650000 00000000  temp_queue......
  1db0: 00000000 00000000 00000000 00000000  ................
  1dc0: 00000000 00000000 00000000 00000000  ................
  1dd0: 00000000 00000000 00000000 00000000  ................
  1de0: 15400000 80db0200 00400000 00000000  .@.......@......
  1df0: 43974300 00000000 00000000 00000000  C.C.............
  1e00: 00000000 00000000 01007200 03000000  ..........r.....
  1e10: 00000000 00000000 00010000 148d141c  ................

 Item   8 -- Length:  160  Offset: 7392 (0x1ce0)  Flags: NORMAL
  XMIN: 471109460  XMAX: 471110027  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 9   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1ce0: 548f141c 8b91141c 00000000 0000b23c  T..............<
  1cf0: 09001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  1d00: 74656d70 5f717565 75650000 00000000  temp_queue......
  1d10: 00000000 00000000 00000000 00000000  ................
  1d20: 00000000 00000000 00000000 00000000  ................
  1d30: 00000000 00000000 00000000 00000000  ................
  1d40: 15400000 80db0200 00400000 00000000  .@.......@......
  1d50: 48974300 00000000 00000000 00000000  H.C.............
  1d60: 00000000 00000000 01007200 03000000  ..........r.....
  1d70: 00000000 00000000 00010000 548f141c  ............T...

 Item   9 -- Length:    0  Offset:    0 (0x0000)  Flags: UNUSED
 Item  10 -- Length:    0  Offset:    0 (0x0000)  Flags: UNUSED
 Item  11 -- Length:  160  Offset: 7232 (0x1c40)  Flags: NORMAL
  XMIN: 471111085  XMAX: 471111481  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 12   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1c40: ad95141c 3997141c 00000000 0000b23c  ....9..........<
  1c50: 0c001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  1c60: 74656d70 5f717565 75650000 00000000  temp_queue......
  1c70: 00000000 00000000 00000000 00000000  ................
  1c80: 00000000 00000000 00000000 00000000  ................
  1c90: 00000000 00000000 00000000 00000000  ................
  1ca0: 15400000 80db0200 00400000 00000000  .@.......@......
  1cb0: 57974300 00000000 00000000 00000000  W.C.............
  1cc0: 00000000 00000000 01007200 03000000  ..........r.....
  1cd0: 00000000 00000000 00010000 ad95141c  ................

 Item  12 -- Length:  160  Offset: 7072 (0x1ba0)  Flags: NORMAL
  XMIN: 471111481  XMAX: 471112070  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 13   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1ba0: 3997141c 8699141c 00000000 0000b23c  9..............<
  1bb0: 0d001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  1bc0: 74656d70 5f717565 75650000 00000000  temp_queue......
  1bd0: 00000000 00000000 00000000 00000000  ................
  1be0: 00000000 00000000 00000000 00000000  ................
  1bf0: 00000000 00000000 00000000 00000000  ................
  1c00: 15400000 80db0200 00400000 00000000  .@.......@......
  1c10: 5c974300 00000000 00000000 00000000  \.C.............
  1c20: 00000000 00000000 01007200 03000000  ..........r.....
  1c30: 00000000 00000000 00010000 3897141c  ............8...

 Item  13 -- Length:  160  Offset: 6912 (0x1b00)  Flags: NORMAL
  XMIN: 471112070  XMAX: 471112509  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 14   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1b00: 8699141c 3d9b141c 00000000 0000b23c  ....=..........<
  1b10: 0e001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  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.............
  1b80: 00000000 00000000 01007200 03000000  ..........r.....
  1b90: 00000000 00000000 00010000 7e99141c  ............~...

 Item  14 -- Length:  160  Offset: 6752 (0x1a60)  Flags: NORMAL
  XMIN: 471112509  XMAX: 471113050  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 15   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1a60: 3d9b141c 5a9d141c 00000000 0000b23c  =...Z..........<
  1a70: 0f001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  1a80: 74656d70 5f717565 75650000 00000000  temp_queue......
  1a90: 00000000 00000000 00000000 00000000  ................
  1aa0: 00000000 00000000 00000000 00000000  ................
  1ab0: 00000000 00000000 00000000 00000000  ................
  1ac0: 15400000 80db0200 00400000 00000000  .@.......@......
  1ad0: 66974300 00000000 00000000 00000000  f.C.............
  1ae0: 00000000 00000000 01007200 03000000  ..........r.....
  1af0: 00000000 00000000 00010000 1b9b141c  ................

 Item  15 -- Length:  160  Offset: 6592 (0x19c0)  Flags: NORMAL
  XMIN: 471113050  XMAX: 471113635  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 16   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  19c0: 5a9d141c a39f141c 00000000 0000b23c  Z..............<
  19d0: 10001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  19e0: 74656d70 5f717565 75650000 00000000  temp_queue......
  19f0: 00000000 00000000 00000000 00000000  ................
  1a00: 00000000 00000000 00000000 00000000  ................
  1a10: 00000000 00000000 00000000 00000000  ................
  1a20: 15400000 80db0200 00400000 00000000  .@.......@......
  1a30: 6b974300 00000000 00000000 00000000  k.C.............
  1a40: 00000000 00000000 01007200 03000000  ..........r.....
  1a50: 00000000 00000000 00010000 5a9d141c  ............Z...

 Item  16 -- Length:  160  Offset: 6432 (0x1920)  Flags: NORMAL
  XMIN: 471113635  XMAX: 471114151  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 17   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1920: a39f141c a7a1141c 00000000 0000b23c  ...............<
  1930: 11001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  1940: 74656d70 5f717565 75650000 00000000  temp_queue......
  1950: 00000000 00000000 00000000 00000000  ................
  1960: 00000000 00000000 00000000 00000000  ................
  1970: 00000000 00000000 00000000 00000000  ................
  1980: 15400000 80db0200 00400000 00000000  .@.......@......
  1990: 70974300 00000000 00000000 00000000  p.C.............
  19a0: 00000000 00000000 01007200 03000000  ..........r.....
  19b0: 00000000 00000000 00010000 9f9f141c  ................

 Item  17 -- Length:  160  Offset: 6272 (0x1880)  Flags: NORMAL
  XMIN: 471114151  XMAX: 471114646  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 18   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1880: a7a1141c 96a3141c 00000000 0000b23c  ...............<
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  18b0: 00000000 00000000 00000000 00000000  ................
  18c0: 00000000 00000000 00000000 00000000  ................
  18d0: 00000000 00000000 00000000 00000000  ................
  18e0: 15400000 80db0200 00400000 00000000  .@.......@......
  18f0: 75974300 00000000 00000000 00000000  u.C.............
  1900: 00000000 00000000 01007200 03000000  ..........r.....
  1910: 00000000 00000000 00010000 a7a1141c  ................

 Item  18 -- Length:    0  Offset:    0 (0x0000)  Flags: UNUSED
 Item  19 -- Length:    0  Offset:    0 (0x0000)  Flags: UNUSED
 Item  20 -- Length:  160  Offset: 6112 (0x17e0)  Flags: NORMAL
  XMIN: 471115662  XMAX: 471116262  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 21   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  17e0: 8ea7141c e6a9141c 00000000 0000b23c  ...............<
  17f0: 15001bc0 092520ff ffff0100 7edb0200  .....% .....~...
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  1810: 00000000 00000000 00000000 00000000  ................
  1820: 00000000 00000000 00000000 00000000  ................
  1830: 00000000 00000000 00000000 00000000  ................
  1840: 15400000 80db0200 00400000 00000000  .@.......@......
  1850: 84974300 00000000 00000000 00000000  ..C.............
  1860: 00000000 00000000 01007200 03000000  ..........r.....
  1870: 00000000 00000000 00010000 8ea7141c  ................

 Item  21 -- Length:  160  Offset: 5952 (0x1740)  Flags: NORMAL
  XMIN: 471116262  XMAX: 471116790  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 22   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1740: e6a9141c f6ab141c 00000000 0000b23c  ...............<
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  1770: 00000000 00000000 00000000 00000000  ................
  1780: 00000000 00000000 00000000 00000000  ................
  1790: 00000000 00000000 00000000 00000000  ................
  17a0: 15400000 80db0200 00400000 00000000  .@.......@......
  17b0: 89974300 00000000 00000000 00000000  ..C.............
  17c0: 00000000 00000000 01007200 03000000  ..........r.....
  17d0: 00000000 00000000 00010000 e6a9141c  ................

 Item  22 -- Length:  160  Offset: 5792 (0x16a0)  Flags: NORMAL
  XMIN: 471116790  XMAX: 471117318  CID|XVAC: 0  OID: 187262
  Block Id: 15538  linp Index: 23   Attributes: 27   Size: 32
  infomask: 0x2509 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_COMMITTED|UPDATED|HOT_UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  16a0: f6ab141c 06ae141c 00000000 0000b23c  ...............<
  16b0: 17001bc0 092520ff ffff0100 7edb0200  .....% .....~...
  16c0: 74656d70 5f717565 75650000 00000000  temp_queue......
  16d0: 00000000 00000000 00000000 00000000  ................
  16e0: 00000000 00000000 00000000 00000000  ................
  16f0: 00000000 00000000 00000000 00000000  ................
  1700: 15400000 80db0200 00400000 00000000  .@.......@......
  1710: 8e974300 00000000 00000000 00000000  ..C.............
  1720: 00000000 00000000 01007200 03000000  ..........r.....
  1730: 00000000 00000000 00010000 f6ab141c  ................

 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 (HASNULL|HASOID|XMIN_COMMITTED|XMAX_INVALID|UPDATED|HEAP_ONLY)
  t_bits: [0]: 0xff [1]: 0xff [2]: 0xff [3]: 0x01

  1600: 06ae141c 00000000 00000000 0000b23c  ...............<
  1610: 17001b80 092920ff ffff0100 7edb0200  .....) .....~...
  1620: 74656d70 5f717565 75650000 00000000  temp_queue......
  1630: 00000000 00000000 00000000 00000000  ................
  1640: 00000000 00000000 00000000 00000000  ................
  1650: 00000000 00000000 00000000 00000000  ................
  1660: 15400000 80db0200 00400000 00000000  .@.......@......
  1670: 93974300 00000000 00000000 00000000  ..C.............
  1680: 00000000 00000000 01007200 03000000  ..........r.....
  1690: 00000000 00000000 00010000 06ae141c  ................

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