diff options
Diffstat (limited to 'src/backend/commands/cluster.c')
| -rw-r--r-- | src/backend/commands/cluster.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c index 191ef543cd2..bcc7d1eb536 100644 --- a/src/backend/commands/cluster.c +++ b/src/backend/commands/cluster.c @@ -38,6 +38,7 @@ #include "miscadmin.h" #include "optimizer/planner.h" #include "storage/bufmgr.h" +#include "storage/lmgr.h" #include "storage/procarray.h" #include "storage/smgr.h" #include "utils/acl.h" @@ -751,6 +752,22 @@ copy_heap_data(Oid OIDNewHeap, Oid OIDOldHeap, Oid OIDOldIndex, isnull = (bool *) palloc(natts * sizeof(bool)); /* + * If the OldHeap has a toast table, get lock on the toast table to keep + * it from being vacuumed. This is needed because autovacuum processes + * toast tables independently of their main tables, with no lock on the + * latter. If an autovacuum were to start on the toast table after we + * compute our OldestXmin below, it would use a later OldestXmin, and then + * possibly remove as DEAD toast tuples belonging to main tuples we think + * are only RECENTLY_DEAD. Then we'd fail while trying to copy those + * tuples. + * + * We don't need to open the toast relation here, just lock it. The lock + * will be held till end of transaction. + */ + if (OldHeap->rd_rel->reltoastrelid) + LockRelationOid(OldHeap->rd_rel->reltoastrelid, AccessExclusiveLock); + + /* * We need to log the copied data in WAL iff WAL archiving/streaming is * enabled AND it's not a WAL-logged rel. */ |