diff options
Diffstat (limited to 'src/backend/catalog/pg_largeobject.c')
| -rw-r--r-- | src/backend/catalog/pg_largeobject.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/src/backend/catalog/pg_largeobject.c b/src/backend/catalog/pg_largeobject.c index c2982e30717..d27b20ede33 100644 --- a/src/backend/catalog/pg_largeobject.c +++ b/src/backend/catalog/pg_largeobject.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/catalog/pg_largeobject.c,v 1.36 2010/01/02 16:57:36 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/catalog/pg_largeobject.c,v 1.37 2010/01/07 02:41:16 rhaas Exp $ * *------------------------------------------------------------------------- */ @@ -251,9 +251,11 @@ LargeObjectAlterOwner(Oid loid, Oid newOwnerId) * We don't use the system cache to for large object metadata, for fear of * using too much local memory. * - * Note that LargeObjectExists always scans the system catalog - * with SnapshotNow, so it is unavailable to use to check - * existence in read-only accesses. + * This function always scans the system catalog using SnapshotNow, so it + * should not be used when a large object is opened in read-only mode (because + * large objects opened in read only mode are supposed to be viewed relative + * to the caller's snapshot, whereas in read-write mode they are relative to + * SnapshotNow). */ bool LargeObjectExists(Oid loid) |