Stefan Kaltenbrunner wrote:
Bruce Momjian wrote:
Log Message:
Reduce WAL activity for page splits:

Currently, an index split writes all the data on the split page to
WAL. That's a lot of WAL traffic. The tuples that are copied to the
right page need to be WAL logged, but the tuples that stay on the
original page don't.

this patch killed both of my OpenBSD buildfarm members

Sorry about that.. I'll take a look at it.

a backtrace of the crash shows:

(gdb) bt
#0 0x1c055504 in _bt_split (rel=0x835fcab0, buf=53, firstright=50, newitemoff=54, newitemsz=76,
    newitem=0x8210a364, newitemonleft=0 '\0') at nbtinsert.c:956
#1 0x1c05468b in _bt_insertonpg (rel=0x835fcab0, buf=53, stack=0x8210a078, keysz=2, scankey=0x8210a3f0, itup=0x8210a364, afteritem=0, split_only_page=0 '\0') at nbtinsert.c:538 #2 0x1c053fae in _bt_doinsert (rel=0x835fcab0, itup=0x8210a364, index_is_unique=1 '\001', heapRel=0x7ec0ee7c)
    at nbtinsert.c:141
#3  0x1c05a1c4 in btinsert (fcinfo=0x2) at nbtree.c:224
#4 0x1c2028fc in FunctionCall6 (flinfo=0x8bc6d1f0, arg1=2, arg2=2, arg3=2, arg4=2, arg5=2, arg6=2) at fmgr.c:1267 #5 0x1c052d20 in index_insert (indexRelation=0x835fcab0, values=0xcf7defd0, isnull=0xcf7df050 "", heap_t_ctid=0x7df53e50, heapRelation=0x7ec0ee7c, check_uniqueness=1 '\001') at indexam.c:196 #6 0x1c08f87e in CatalogIndexInsert (indstate=0x2, heapTuple=0x8210a224) at indexing.c:124 #7 0x1c08f902 in CatalogUpdateIndexes (heapRel=0x7ec0ee7c, heapTuple=0x7df53e4c) at indexing.c:149 #8 0x1c17255c in SetRelationRuleStatus (relationId=10951, relHasRules=1 '\001', relIsBecomingView=0 '\0')
    at rewriteSupport.c:80
#9 0x1c16f074 in DefineQueryRewrite (stmt=0x82ca7e78) at rewriteDefine.c:432 #10 0x1c18c822 in PortalRunUtility (portal=0x82cb201c, query=0x81897484, dest=0x3c0c8ff4,
    completionTag=0xcf7df2a0 "") at pquery.c:1063
#11 0x1c18cb12 in PortalRunMulti (portal=0x82cb201c, dest=0x3c0c8ff4, altdest=0x3c0c8ff4,
    completionTag=0xcf7df2a0 "") at pquery.c:1131
#12 0x1c18c28a in PortalRun (portal=0x82cb201c, count=2147483647, dest=0x3c0c8ff4, altdest=0x3c0c8ff4,
    completionTag=0xcf7df2a0 "") at pquery.c:700
#13 0x1c187d13 in exec_simple_query (
query_string=0x84a2501c "/*\n * PostgreSQL System Views\n *\n * Copyright (c) 1996-2007, PostgreSQL Global Development Group\n *\n * $PostgreSQL: pgsql/src/backend/catalog/system_views.sql,v 1.35 2007/01/05 22:19:25 momjian Exp $\n"...) at postgres.c:939 #14 0x1c18abb2 in PostgresMain (argc=1, argv=0xcf7df480, username=0x80ba55b0 "mastermind") at postgres.c:3423
#15 0x1c122102 in main (argc=10, argv=0xcf7df47c) at main.c:186


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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not

  Heikki Linnakangas

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TIP 2: Don't 'kill -9' the postmaster

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