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Nested transactions. There is still much left to do, especially on the

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performance front, but with feature freeze upon us I think it's time to
drive a stake in the ground and say that this will be in 7.5.

Alvaro Herrera, with some help from Tom Lane.
This commit is contained in:
Tom Lane
2004-07-01 00:52:04 +00:00
parent 4c9aa572fa
commit 573a71a5da
74 changed files with 4516 additions and 1144 deletions
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67
src/backend/postmaster/pgstat.c
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@@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2003, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.76 2004/06/26 16:32:02 tgl Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.77 2004/07/01 00:50:36 tgl Exp $
* ----------
*/
#include "postgres.h"
@@ -167,6 +167,7 @@ static void pgstat_write_statsfile(void);
static void pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
PgStat_StatBeEntry **betab,
int *numbackends);
static void backend_read_statsfile(void);
static void pgstat_setheader(PgStat_MsgHdr *hdr, int mtype);
static void pgstat_send(void *msg, int len);
@@ -786,12 +787,7 @@ pgstat_vacuum_tabstat(void)
* If not done for this transaction, read the statistics collector
* stats file into some hash tables.
*/
if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
{
pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
&pgStatBeTable, &pgStatNumBackends);
pgStatDBHashXact = GetCurrentTransactionId();
}
backend_read_statsfile();
/*
* Lookup our own database entry
@@ -1210,15 +1206,9 @@ pgstat_fetch_stat_dbentry(Oid dbid)
/*
* If not done for this transaction, read the statistics collector
* stats file into some hash tables. Be careful with the
* read_statsfile() call below!
* stats file into some hash tables.
*/
if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
{
pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
&pgStatBeTable, &pgStatNumBackends);
pgStatDBHashXact = GetCurrentTransactionId();
}
backend_read_statsfile();
/*
* Lookup the requested database
@@ -1250,15 +1240,9 @@ pgstat_fetch_stat_tabentry(Oid relid)
/*
* If not done for this transaction, read the statistics collector
* stats file into some hash tables. Be careful with the
* read_statsfile() call below!
* stats file into some hash tables.
*/
if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
{
pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
&pgStatBeTable, &pgStatNumBackends);
pgStatDBHashXact = GetCurrentTransactionId();
}
backend_read_statsfile();
/*
* Lookup our database.
@@ -1296,12 +1280,7 @@ pgstat_fetch_stat_tabentry(Oid relid)
PgStat_StatBeEntry *
pgstat_fetch_stat_beentry(int beid)
{
if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
{
pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
&pgStatBeTable, &pgStatNumBackends);
pgStatDBHashXact = GetCurrentTransactionId();
}
backend_read_statsfile();
if (beid < 1 || beid > pgStatNumBackends)
return NULL;
@@ -1320,12 +1299,7 @@ pgstat_fetch_stat_beentry(int beid)
int
pgstat_fetch_stat_numbackends(void)
{
if (!TransactionIdEquals(pgStatDBHashXact, GetCurrentTransactionId()))
{
pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
&pgStatBeTable, &pgStatNumBackends);
pgStatDBHashXact = GetCurrentTransactionId();
}
backend_read_statsfile();
return pgStatNumBackends;
}
@@ -2759,11 +2733,32 @@ pgstat_read_statsfile(HTAB **dbhash, Oid onlydb,
fclose(fpin);
}
/*
* If not done for this transaction, read the statistics collector
* stats file into some hash tables.
*
* Because we store the hash tables in TopTransactionContext, the result
* is good for the entire current main transaction.
*/
static void
backend_read_statsfile(void)
{
TransactionId topXid = GetTopTransactionId();
if (!TransactionIdEquals(pgStatDBHashXact, topXid))
{
Assert(!pgStatRunningInCollector);
pgstat_read_statsfile(&pgStatDBHash, MyDatabaseId,
&pgStatBeTable, &pgStatNumBackends);
pgStatDBHashXact = topXid;
}
}
/* ----------
* pgstat_recv_bestart() -
*
* Process a backend starup message.
* Process a backend startup message.
* ----------
*/
static void