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Allow ANALYZE to run in a transaction.
This commit is contained in:
Bruce Momjian
@@ -13,7 +13,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.226 2002/05/24 18:57:56 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.227 2002/06/13 19:52:02 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -110,8 +110,6 @@ static TransactionId initialFreezeLimit;
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/* non-export function prototypes */
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static void vacuum_init(VacuumStmt *vacstmt);
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static void vacuum_shutdown(VacuumStmt *vacstmt);
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static List *getrels(const RangeVar *vacrel, const char *stmttype);
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static void vac_update_dbstats(Oid dbid,
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TransactionId vacuumXID,
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@@ -160,6 +158,8 @@ static bool enough_space(VacPage vacpage, Size len);
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void
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vacuum(VacuumStmt *vacstmt)
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{
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MemoryContext anl_context,
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old_context;
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const char *stmttype = vacstmt->vacuum ? "VACUUM" : "ANALYZE";
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List *vrl,
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*cur;
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@@ -178,13 +178,13 @@ vacuum(VacuumStmt *vacstmt)
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* user's transaction too, which would certainly not be the desired
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* behavior.
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*/
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if (IsTransactionBlock())
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if (vacstmt->vacuum && IsTransactionBlock())
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elog(ERROR, "%s cannot run inside a BEGIN/END block", stmttype);
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/* Running VACUUM from a function would free the function context */
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if (!MemoryContextContains(QueryContext, vacstmt))
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if (vacstmt->vacuum && !MemoryContextContains(QueryContext, vacstmt))
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elog(ERROR, "%s cannot be executed from a function", stmttype);
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/*
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* Send info about dead objects to the statistics collector
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*/
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@@ -203,13 +203,62 @@ vacuum(VacuumStmt *vacstmt)
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ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
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if (vacstmt->analyze && !vacstmt->vacuum)
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anl_context = AllocSetContextCreate(QueryContext,
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"Analyze",
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ALLOCSET_DEFAULT_MINSIZE,
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ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
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/* Build list of relations to process (note this lives in vac_context) */
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vrl = getrels(vacstmt->relation, stmttype);
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/*
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* Start up the vacuum cleaner.
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* Formerly, there was code here to prevent more than one VACUUM from
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* executing concurrently in the same database. However, there's no
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* good reason to prevent that, and manually removing lockfiles after
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* a vacuum crash was a pain for dbadmins. So, forget about lockfiles,
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* and just rely on the locks we grab on each target table
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* to ensure that there aren't two VACUUMs running on the same table
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* at the same time.
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*
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* The strangeness with committing and starting transactions in the
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* init and shutdown routines is due to the fact that the vacuum cleaner
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* is invoked via an SQL command, and so is already executing inside
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* a transaction. We need to leave ourselves in a predictable state
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* on entry and exit to the vacuum cleaner. We commit the transaction
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* started in PostgresMain() inside vacuum_init(), and start one in
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* vacuum_shutdown() to match the commit waiting for us back in
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* PostgresMain().
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*/
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vacuum_init(vacstmt);
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if (vacstmt->vacuum)
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{
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if (vacstmt->relation == NULL)
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{
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/*
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* Compute the initially applicable OldestXmin and FreezeLimit
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* XIDs, so that we can record these values at the end of the
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* VACUUM. Note that individual tables may well be processed with
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* newer values, but we can guarantee that no (non-shared)
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* relations are processed with older ones.
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*
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* It is okay to record non-shared values in pg_database, even though
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* we may vacuum shared relations with older cutoffs, because only
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* the minimum of the values present in pg_database matters. We
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* can be sure that shared relations have at some time been
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* vacuumed with cutoffs no worse than the global minimum; for, if
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* there is a backend in some other DB with xmin = OLDXMIN that's
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* determining the cutoff with which we vacuum shared relations,
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* it is not possible for that database to have a cutoff newer
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* than OLDXMIN recorded in pg_database.
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*/
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vacuum_set_xid_limits(vacstmt, false,
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&initialOldestXmin, &initialFreezeLimit);
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}
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/* matches the StartTransaction in PostgresMain() */
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CommitTransactionCommand();
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}
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/*
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* Process each selected relation. We are careful to process each
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@@ -225,81 +274,44 @@ vacuum(VacuumStmt *vacstmt)
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if (vacstmt->vacuum)
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vacuum_rel(relid, vacstmt, RELKIND_RELATION);
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if (vacstmt->analyze)
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{
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/* If we vacuumed, use new transaction for analyze. */
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if (vacstmt->vacuum)
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StartTransactionCommand();
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else
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old_context = MemoryContextSwitchTo(anl_context);
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analyze_rel(relid, vacstmt);
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if (vacstmt->vacuum)
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CommitTransactionCommand();
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else
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{
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MemoryContextResetAndDeleteChildren(anl_context);
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MemoryContextSwitchTo(old_context);
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}
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}
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}
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/* clean up */
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vacuum_shutdown(vacstmt);
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}
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/*
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* vacuum_init(), vacuum_shutdown() -- start up and shut down the vacuum cleaner.
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*
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* Formerly, there was code here to prevent more than one VACUUM from
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* executing concurrently in the same database. However, there's no
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* good reason to prevent that, and manually removing lockfiles after
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* a vacuum crash was a pain for dbadmins. So, forget about lockfiles,
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* and just rely on the locks we grab on each target table
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* to ensure that there aren't two VACUUMs running on the same table
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* at the same time.
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*
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* The strangeness with committing and starting transactions in the
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* init and shutdown routines is due to the fact that the vacuum cleaner
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* is invoked via an SQL command, and so is already executing inside
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* a transaction. We need to leave ourselves in a predictable state
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* on entry and exit to the vacuum cleaner. We commit the transaction
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* started in PostgresMain() inside vacuum_init(), and start one in
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* vacuum_shutdown() to match the commit waiting for us back in
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* PostgresMain().
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*/
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static void
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vacuum_init(VacuumStmt *vacstmt)
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{
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if (vacstmt->vacuum && vacstmt->relation == NULL)
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if (vacstmt->vacuum)
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{
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/* on entry, we are not in a transaction */
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/* matches the CommitTransaction in PostgresMain() */
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StartTransactionCommand();
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/*
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* Compute the initially applicable OldestXmin and FreezeLimit
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* XIDs, so that we can record these values at the end of the
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* VACUUM. Note that individual tables may well be processed with
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* newer values, but we can guarantee that no (non-shared)
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* relations are processed with older ones.
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*
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* It is okay to record non-shared values in pg_database, even though
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* we may vacuum shared relations with older cutoffs, because only
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* the minimum of the values present in pg_database matters. We
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* can be sure that shared relations have at some time been
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* vacuumed with cutoffs no worse than the global minimum; for, if
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* there is a backend in some other DB with xmin = OLDXMIN that's
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* determining the cutoff with which we vacuum shared relations,
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* it is not possible for that database to have a cutoff newer
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* than OLDXMIN recorded in pg_database.
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* If we did a database-wide VACUUM, update the database's pg_database
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* row with info about the transaction IDs used, and try to truncate
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* pg_clog.
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*/
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vacuum_set_xid_limits(vacstmt, false,
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&initialOldestXmin, &initialFreezeLimit);
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}
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/* matches the StartTransaction in PostgresMain() */
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CommitTransactionCommand();
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}
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static void
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vacuum_shutdown(VacuumStmt *vacstmt)
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{
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/* on entry, we are not in a transaction */
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/* matches the CommitTransaction in PostgresMain() */
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StartTransactionCommand();
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/*
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* If we did a database-wide VACUUM, update the database's pg_database
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* row with info about the transaction IDs used, and try to truncate
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* pg_clog.
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*/
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if (vacstmt->vacuum && vacstmt->relation == NULL)
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{
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vac_update_dbstats(MyDatabaseId,
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initialOldestXmin, initialFreezeLimit);
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vac_truncate_clog(initialOldestXmin, initialFreezeLimit);
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if (vacstmt->relation == NULL)
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{
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vac_update_dbstats(MyDatabaseId,
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initialOldestXmin, initialFreezeLimit);
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vac_truncate_clog(initialOldestXmin, initialFreezeLimit);
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}
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}
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/*
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@@ -309,6 +321,10 @@ vacuum_shutdown(VacuumStmt *vacstmt)
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*/
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MemoryContextDelete(vac_context);
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vac_context = NULL;
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if (vacstmt->analyze && !vacstmt->vacuum)
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MemoryContextDelete(anl_context);
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}
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/*
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