예제 #1
0
/*
 * create_toast_table --- internal workhorse
 *
 * rel is already opened and locked
 * toastOid and toastIndexOid are normally InvalidOid, but during
 * bootstrap they can be nonzero to specify hand-assigned OIDs
 */
static bool
create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid,
				   Datum reloptions, LOCKMODE lockmode, bool check)
{
	Oid			relOid = RelationGetRelid(rel);
	HeapTuple	reltup;
	TupleDesc	tupdesc;
	bool		shared_relation;
	bool		mapped_relation;
	Relation	toast_rel;
	Relation	class_rel;
	Oid			toast_relid;
	Oid			toast_typid = InvalidOid;
	Oid			namespaceid;
	char		toast_relname[NAMEDATALEN];
	char		toast_idxname[NAMEDATALEN];
	IndexInfo  *indexInfo;
	Oid			collationObjectId[2];
	Oid			classObjectId[2];
	int16		coloptions[2];
	ObjectAddress baseobject,
				toastobject;

	/*
	 * Toast table is shared if and only if its parent is.
	 *
	 * We cannot allow toasting a shared relation after initdb (because
	 * there's no way to mark it toasted in other databases' pg_class).
	 */
	shared_relation = rel->rd_rel->relisshared;
	if (shared_relation && !IsBootstrapProcessingMode())
		ereport(ERROR,
				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
				 errmsg("shared tables cannot be toasted after initdb")));

	/* It's mapped if and only if its parent is, too */
	mapped_relation = RelationIsMapped(rel);

	/*
	 * Is it already toasted?
	 */
	if (rel->rd_rel->reltoastrelid != InvalidOid)
		return false;

	/*
	 * Check to see whether the table actually needs a TOAST table.
	 */
	if (!IsBinaryUpgrade)
	{
		/* Normal mode, normal check */
		if (!needs_toast_table(rel))
			return false;
	}
	else
	{
		/*
		 * In binary-upgrade mode, create a TOAST table if and only if
		 * pg_upgrade told us to (ie, a TOAST table OID has been provided).
		 *
		 * This indicates that the old cluster had a TOAST table for the
		 * current table.  We must create a TOAST table to receive the old
		 * TOAST file, even if the table seems not to need one.
		 *
		 * Contrariwise, if the old cluster did not have a TOAST table, we
		 * should be able to get along without one even if the new version's
		 * needs_toast_table rules suggest we should have one.  There is a lot
		 * of daylight between where we will create a TOAST table and where
		 * one is really necessary to avoid failures, so small cross-version
		 * differences in the when-to-create heuristic shouldn't be a problem.
		 * If we tried to create a TOAST table anyway, we would have the
		 * problem that it might take up an OID that will conflict with some
		 * old-cluster table we haven't seen yet.
		 */
		if (!OidIsValid(binary_upgrade_next_toast_pg_class_oid) ||
			!OidIsValid(binary_upgrade_next_toast_pg_type_oid))
			return false;
	}

	/*
	 * If requested check lockmode is sufficient. This is a cross check in
	 * case of errors or conflicting decisions in earlier code.
	 */
	if (check && lockmode != AccessExclusiveLock)
		elog(ERROR, "AccessExclusiveLock required to add toast table.");

	/*
	 * Create the toast table and its index
	 */
	snprintf(toast_relname, sizeof(toast_relname),
			 "pg_toast_%u", relOid);
	snprintf(toast_idxname, sizeof(toast_idxname),
			 "pg_toast_%u_index", relOid);

	/* this is pretty painful...  need a tuple descriptor */
	tupdesc = CreateTemplateTupleDesc(3);
	TupleDescInitEntry(tupdesc, (AttrNumber) 1,
					   "chunk_id",
					   OIDOID,
					   -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 2,
					   "chunk_seq",
					   INT4OID,
					   -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 3,
					   "chunk_data",
					   BYTEAOID,
					   -1, 0);

	/*
	 * Ensure that the toast table doesn't itself get toasted, or we'll be
	 * toast :-(.  This is essential for chunk_data because type bytea is
	 * toastable; hit the other two just to be sure.
	 */
	TupleDescAttr(tupdesc, 0)->attstorage = 'p';
	TupleDescAttr(tupdesc, 1)->attstorage = 'p';
	TupleDescAttr(tupdesc, 2)->attstorage = 'p';

	/*
	 * Toast tables for regular relations go in pg_toast; those for temp
	 * relations go into the per-backend temp-toast-table namespace.
	 */
	if (isTempOrTempToastNamespace(rel->rd_rel->relnamespace))
		namespaceid = GetTempToastNamespace();
	else
		namespaceid = PG_TOAST_NAMESPACE;

	/*
	 * Use binary-upgrade override for pg_type.oid, if supplied.  We might be
	 * in the post-schema-restore phase where we are doing ALTER TABLE to
	 * create TOAST tables that didn't exist in the old cluster.
	 */
	if (IsBinaryUpgrade && OidIsValid(binary_upgrade_next_toast_pg_type_oid))
	{
		toast_typid = binary_upgrade_next_toast_pg_type_oid;
		binary_upgrade_next_toast_pg_type_oid = InvalidOid;
	}

	toast_relid = heap_create_with_catalog(toast_relname,
										   namespaceid,
										   rel->rd_rel->reltablespace,
										   toastOid,
										   toast_typid,
										   InvalidOid,
										   rel->rd_rel->relowner,
										   tupdesc,
										   NIL,
										   RELKIND_TOASTVALUE,
										   rel->rd_rel->relpersistence,
										   shared_relation,
										   mapped_relation,
										   ONCOMMIT_NOOP,
										   reloptions,
										   false,
										   true,
										   true,
										   InvalidOid,
										   NULL);
	Assert(toast_relid != InvalidOid);

	/* make the toast relation visible, else heap_open will fail */
	CommandCounterIncrement();

	/* ShareLock is not really needed here, but take it anyway */
	toast_rel = heap_open(toast_relid, ShareLock);

	/*
	 * Create unique index on chunk_id, chunk_seq.
	 *
	 * NOTE: the normal TOAST access routines could actually function with a
	 * single-column index on chunk_id only. However, the slice access
	 * routines use both columns for faster access to an individual chunk. In
	 * addition, we want it to be unique as a check against the possibility of
	 * duplicate TOAST chunk OIDs. The index might also be a little more
	 * efficient this way, since btree isn't all that happy with large numbers
	 * of equal keys.
	 */

	indexInfo = makeNode(IndexInfo);
	indexInfo->ii_NumIndexAttrs = 2;
	indexInfo->ii_NumIndexKeyAttrs = 2;
	indexInfo->ii_IndexAttrNumbers[0] = 1;
	indexInfo->ii_IndexAttrNumbers[1] = 2;
	indexInfo->ii_Expressions = NIL;
	indexInfo->ii_ExpressionsState = NIL;
	indexInfo->ii_Predicate = NIL;
	indexInfo->ii_PredicateState = NULL;
	indexInfo->ii_ExclusionOps = NULL;
	indexInfo->ii_ExclusionProcs = NULL;
	indexInfo->ii_ExclusionStrats = NULL;
	indexInfo->ii_Unique = true;
	indexInfo->ii_ReadyForInserts = true;
	indexInfo->ii_Concurrent = false;
	indexInfo->ii_BrokenHotChain = false;
	indexInfo->ii_ParallelWorkers = 0;
	indexInfo->ii_Am = BTREE_AM_OID;
	indexInfo->ii_AmCache = NULL;
	indexInfo->ii_Context = CurrentMemoryContext;

	collationObjectId[0] = InvalidOid;
	collationObjectId[1] = InvalidOid;

	classObjectId[0] = OID_BTREE_OPS_OID;
	classObjectId[1] = INT4_BTREE_OPS_OID;

	coloptions[0] = 0;
	coloptions[1] = 0;

	index_create(toast_rel, toast_idxname, toastIndexOid, InvalidOid,
				 InvalidOid, InvalidOid,
				 indexInfo,
				 list_make2("chunk_id", "chunk_seq"),
				 BTREE_AM_OID,
				 rel->rd_rel->reltablespace,
				 collationObjectId, classObjectId, coloptions, (Datum) 0,
				 INDEX_CREATE_IS_PRIMARY, 0, true, true, NULL);

	heap_close(toast_rel, NoLock);

	/*
	 * Store the toast table's OID in the parent relation's pg_class row
	 */
	class_rel = heap_open(RelationRelationId, RowExclusiveLock);

	reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relOid));
	if (!HeapTupleIsValid(reltup))
		elog(ERROR, "cache lookup failed for relation %u", relOid);

	((Form_pg_class) GETSTRUCT(reltup))->reltoastrelid = toast_relid;

	if (!IsBootstrapProcessingMode())
	{
		/* normal case, use a transactional update */
		CatalogTupleUpdate(class_rel, &reltup->t_self, reltup);
	}
	else
	{
		/* While bootstrapping, we cannot UPDATE, so overwrite in-place */
		heap_inplace_update(class_rel, reltup);
	}

	heap_freetuple(reltup);

	heap_close(class_rel, RowExclusiveLock);

	/*
	 * Register dependency from the toast table to the master, so that the
	 * toast table will be deleted if the master is.  Skip this in bootstrap
	 * mode.
	 */
	if (!IsBootstrapProcessingMode())
	{
		baseobject.classId = RelationRelationId;
		baseobject.objectId = relOid;
		baseobject.objectSubId = 0;
		toastobject.classId = RelationRelationId;
		toastobject.objectId = toast_relid;
		toastobject.objectSubId = 0;

		recordDependencyOn(&toastobject, &baseobject, DEPENDENCY_INTERNAL);
	}

	/*
	 * Make changes visible
	 */
	CommandCounterIncrement();

	return true;
}
예제 #2
0
/*
 * create_toast_table --- internal workhorse
 *
 * rel is already opened and locked
 * toastOid and toastIndexOid are normally InvalidOid, but during
 * bootstrap they can be nonzero to specify hand-assigned OIDs
 */
static bool
create_toast_table(Relation rel, Oid toastOid, Oid toastIndexOid,
				   Datum reloptions, LOCKMODE lockmode, bool check)
{
	Oid			relOid = RelationGetRelid(rel);
	HeapTuple	reltup;
	TupleDesc	tupdesc;
	bool		shared_relation;
	bool		mapped_relation;
	Relation	toast_rel;
	Relation	class_rel;
	Oid			toast_relid;
	Oid			toast_typid = InvalidOid;
	Oid			namespaceid;
	char		toast_relname[NAMEDATALEN];
	char		toast_idxname[NAMEDATALEN];
	IndexInfo  *indexInfo;
	Oid			collationObjectId[2];
	Oid			classObjectId[2];
	int16		coloptions[2];
	ObjectAddress baseobject,
				toastobject;

	/*
	 * Toast table is shared if and only if its parent is.
	 *
	 * We cannot allow toasting a shared relation after initdb (because
	 * there's no way to mark it toasted in other databases' pg_class).
	 */
	shared_relation = rel->rd_rel->relisshared;
	if (shared_relation && !IsBootstrapProcessingMode())
		ereport(ERROR,
				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
				 errmsg("shared tables cannot be toasted after initdb")));

	/* It's mapped if and only if its parent is, too */
	mapped_relation = RelationIsMapped(rel);

	/*
	 * Is it already toasted?
	 */
	if (rel->rd_rel->reltoastrelid != InvalidOid)
		return false;

	if (!IsBinaryUpgrade)
	{
		if (!needs_toast_table(rel))
			return false;
	}
	else
	{
		/*
		 * Check to see whether the table needs a TOAST table.
		 *
		 * If an update-in-place TOAST relfilenode is specified, force TOAST file
		 * creation even if it seems not to need one.  This handles the case
		 * where the old cluster needed a TOAST table but the new cluster
		 * would not normally create one.
		 */

		/*
		 * If a TOAST oid is not specified, skip TOAST creation as we will do
		 * it later so we don't create a TOAST table whose OID later conflicts
		 * with a user-supplied OID.  This handles cases where the old cluster
		 * didn't need a TOAST table, but the new cluster does.
		 */
		if (!OidIsValid(binary_upgrade_next_toast_pg_class_oid))
			return false;

		/*
		 * If a special TOAST value has been passed in, it means we are in
		 * cleanup mode --- we are creating needed TOAST tables after all user
		 * tables with specified OIDs have been created.  We let the system
		 * assign a TOAST oid for us.  The tables are empty so the missing
		 * TOAST tables were not a problem.
		 */
		if (binary_upgrade_next_toast_pg_class_oid == OPTIONALLY_CREATE_TOAST_OID)
		{
			/* clear as it is not to be used; it is just a flag */
			binary_upgrade_next_toast_pg_class_oid = InvalidOid;

			if (!needs_toast_table(rel))
				return false;
		}

		/* both should be set, or not set */
		Assert(OidIsValid(binary_upgrade_next_toast_pg_class_oid) ==
			   OidIsValid(binary_upgrade_next_toast_pg_type_oid));
	}

	/*
	 * If requested check lockmode is sufficient. This is a cross check in
	 * case of errors or conflicting decisions in earlier code.
	 */
	if (check && lockmode != AccessExclusiveLock)
		elog(ERROR, "AccessExclusiveLock required to add toast table.");

	/*
	 * Create the toast table and its index
	 */
	snprintf(toast_relname, sizeof(toast_relname),
			 "pg_toast_%u", relOid);
	snprintf(toast_idxname, sizeof(toast_idxname),
			 "pg_toast_%u_index", relOid);

	/* this is pretty painful...  need a tuple descriptor */
	tupdesc = CreateTemplateTupleDesc(3, false);
	TupleDescInitEntry(tupdesc, (AttrNumber) 1,
					   "chunk_id",
					   OIDOID,
					   -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 2,
					   "chunk_seq",
					   INT4OID,
					   -1, 0);
	TupleDescInitEntry(tupdesc, (AttrNumber) 3,
					   "chunk_data",
					   BYTEAOID,
					   -1, 0);

	/*
	 * Ensure that the toast table doesn't itself get toasted, or we'll be
	 * toast :-(.  This is essential for chunk_data because type bytea is
	 * toastable; hit the other two just to be sure.
	 */
	tupdesc->attrs[0]->attstorage = 'p';
	tupdesc->attrs[1]->attstorage = 'p';
	tupdesc->attrs[2]->attstorage = 'p';

	/*
	 * Toast tables for regular relations go in pg_toast; those for temp
	 * relations go into the per-backend temp-toast-table namespace.
	 */
	if (isTempOrToastNamespace(rel->rd_rel->relnamespace))
		namespaceid = GetTempToastNamespace();
	else
		namespaceid = PG_TOAST_NAMESPACE;

	/* Use binary-upgrade override for pg_type.oid, if supplied. */
	if (IsBinaryUpgrade && OidIsValid(binary_upgrade_next_toast_pg_type_oid))
	{
		toast_typid = binary_upgrade_next_toast_pg_type_oid;
		binary_upgrade_next_toast_pg_type_oid = InvalidOid;
	}

	toast_relid = heap_create_with_catalog(toast_relname,
										   namespaceid,
										   rel->rd_rel->reltablespace,
										   toastOid,
										   toast_typid,
										   InvalidOid,
										   rel->rd_rel->relowner,
										   tupdesc,
										   NIL,
										   RELKIND_TOASTVALUE,
										   rel->rd_rel->relpersistence,
										   shared_relation,
										   mapped_relation,
										   true,
										   0,
										   ONCOMMIT_NOOP,
										   reloptions,
										   false,
										   true,
										   true);
	Assert(toast_relid != InvalidOid);

	/* make the toast relation visible, else heap_open will fail */
	CommandCounterIncrement();

	/* ShareLock is not really needed here, but take it anyway */
	toast_rel = heap_open(toast_relid, ShareLock);

	/*
	 * Create unique index on chunk_id, chunk_seq.
	 *
	 * NOTE: the normal TOAST access routines could actually function with a
	 * single-column index on chunk_id only. However, the slice access
	 * routines use both columns for faster access to an individual chunk. In
	 * addition, we want it to be unique as a check against the possibility of
	 * duplicate TOAST chunk OIDs. The index might also be a little more
	 * efficient this way, since btree isn't all that happy with large numbers
	 * of equal keys.
	 */

	indexInfo = makeNode(IndexInfo);
	indexInfo->ii_NumIndexAttrs = 2;
	indexInfo->ii_KeyAttrNumbers[0] = 1;
	indexInfo->ii_KeyAttrNumbers[1] = 2;
	indexInfo->ii_Expressions = NIL;
	indexInfo->ii_ExpressionsState = NIL;
	indexInfo->ii_Predicate = NIL;
	indexInfo->ii_PredicateState = NIL;
	indexInfo->ii_ExclusionOps = NULL;
	indexInfo->ii_ExclusionProcs = NULL;
	indexInfo->ii_ExclusionStrats = NULL;
	indexInfo->ii_Unique = true;
	indexInfo->ii_ReadyForInserts = true;
	indexInfo->ii_Concurrent = false;
	indexInfo->ii_BrokenHotChain = false;

	collationObjectId[0] = InvalidOid;
	collationObjectId[1] = InvalidOid;

	classObjectId[0] = OID_BTREE_OPS_OID;
	classObjectId[1] = INT4_BTREE_OPS_OID;

	coloptions[0] = 0;
	coloptions[1] = 0;

	index_create(toast_rel, toast_idxname, toastIndexOid, InvalidOid,
				 indexInfo,
				 list_make2("chunk_id", "chunk_seq"),
				 BTREE_AM_OID,
				 rel->rd_rel->reltablespace,
				 collationObjectId, classObjectId, coloptions, (Datum) 0,
				 true, false, false, false,
				 true, false, false, true);

	heap_close(toast_rel, NoLock);

	/*
	 * Store the toast table's OID in the parent relation's pg_class row
	 */
	class_rel = heap_open(RelationRelationId, RowExclusiveLock);

	reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(relOid));
	if (!HeapTupleIsValid(reltup))
		elog(ERROR, "cache lookup failed for relation %u", relOid);

	((Form_pg_class) GETSTRUCT(reltup))->reltoastrelid = toast_relid;

	if (!IsBootstrapProcessingMode())
	{
		/* normal case, use a transactional update */
		simple_heap_update(class_rel, &reltup->t_self, reltup);

		/* Keep catalog indexes current */
		CatalogUpdateIndexes(class_rel, reltup);
	}
	else
	{
		/* While bootstrapping, we cannot UPDATE, so overwrite in-place */
		heap_inplace_update(class_rel, reltup);
	}

	heap_freetuple(reltup);

	heap_close(class_rel, RowExclusiveLock);

	/*
	 * Register dependency from the toast table to the master, so that the
	 * toast table will be deleted if the master is.  Skip this in bootstrap
	 * mode.
	 */
	if (!IsBootstrapProcessingMode())
	{
		baseobject.classId = RelationRelationId;
		baseobject.objectId = relOid;
		baseobject.objectSubId = 0;
		toastobject.classId = RelationRelationId;
		toastobject.objectId = toast_relid;
		toastobject.objectSubId = 0;

		recordDependencyOn(&toastobject, &baseobject, DEPENDENCY_INTERNAL);
	}

	/*
	 * Make changes visible
	 */
	CommandCounterIncrement();

	return true;
}