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Support unlogged tables.

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The contents of an unlogged table are WAL-logged; thus, they are not
available on standby servers and are truncated whenever the database
system enters recovery.  Indexes on unlogged tables are also unlogged.
Unlogged GiST indexes are not currently supported.
This commit is contained in:
Robert Haas
2010-12-29 06:48:53 -05:00
parent 9b8aff8c19
commit 53dbc27c62
49 changed files with 916 additions and 104 deletions
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42
src/backend/access/gin/gininsert.c
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@ -19,6 +19,7 @@
#include "catalog/index.h"
#include "miscadmin.h"
#include "storage/bufmgr.h"
#include "storage/smgr.h"
#include "storage/indexfsm.h"
#include "utils/memutils.h"
@ -411,6 +412,47 @@ ginbuild(PG_FUNCTION_ARGS)
PG_RETURN_POINTER(result);
}
/*
* ginbuildempty() -- build an empty gin index in the initialization fork
*/
Datum
ginbuildempty(PG_FUNCTION_ARGS)
{
Relation index = (Relation) PG_GETARG_POINTER(0);
Buffer RootBuffer,
MetaBuffer;
/* An empty GIN index has two pages. */
MetaBuffer =
ReadBufferExtended(index, INIT_FORKNUM, P_NEW, RBM_NORMAL, NULL);
LockBuffer(MetaBuffer, BUFFER_LOCK_EXCLUSIVE);
RootBuffer =
ReadBufferExtended(index, INIT_FORKNUM, P_NEW, RBM_NORMAL, NULL);
LockBuffer(RootBuffer, BUFFER_LOCK_EXCLUSIVE);
/* Initialize both pages, mark them dirty, unlock and release buffer. */
START_CRIT_SECTION();
GinInitMetabuffer(MetaBuffer);
MarkBufferDirty(MetaBuffer);
GinInitBuffer(RootBuffer, GIN_LEAF);
MarkBufferDirty(RootBuffer);
/* XLOG the new pages */
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
BufferGetBlockNumber(MetaBuffer),
BufferGetPage(MetaBuffer));
log_newpage(&index->rd_smgr->smgr_rnode.node, INIT_FORKNUM,
BufferGetBlockNumber(RootBuffer),
BufferGetPage(RootBuffer));
END_CRIT_SECTION();
/* Unlock and release the buffers. */
UnlockReleaseBuffer(MetaBuffer);
UnlockReleaseBuffer(RootBuffer);
PG_RETURN_VOID();
}
/*
* Inserts value during normal insertion
*/