diff options
| -rw-r--r-- | src/backend/access/transam/subtrans.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/backend/access/transam/subtrans.c b/src/backend/access/transam/subtrans.c index 6b709823227..dde72b7d2e1 100644 --- a/src/backend/access/transam/subtrans.c +++ b/src/backend/access/transam/subtrans.c @@ -44,7 +44,8 @@ * 0xFFFFFFFF/SUBTRANS_XACTS_PER_PAGE, and segment numbering at * 0xFFFFFFFF/SUBTRANS_XACTS_PER_PAGE/SLRU_PAGES_PER_SEGMENT. We need take no * explicit notice of that fact in this module, except when comparing segment - * and page numbers in TruncateSUBTRANS (see SubTransPagePrecedes). + * and page numbers in TruncateSUBTRANS (see SubTransPagePrecedes) and zeroing + * them in StartupSUBTRANS. */ /* We need four bytes per xact */ @@ -253,6 +254,9 @@ StartupSUBTRANS(TransactionId oldestActiveXID) { (void) ZeroSUBTRANSPage(startPage); startPage++; + /* must account for wraparound */ + if (startPage > TransactionIdToPage(MaxTransactionId)) + startPage=0; } (void) ZeroSUBTRANSPage(startPage); |