diff options
| -rw-r--r-- | src/backend/storage/lmgr/predicate.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/backend/storage/lmgr/predicate.c b/src/backend/storage/lmgr/predicate.c index f0c8ee48c34..7f6dcbb6ca6 100644 --- a/src/backend/storage/lmgr/predicate.c +++ b/src/backend/storage/lmgr/predicate.c @@ -305,7 +305,13 @@ static SlruCtlData OldSerXidSlruCtlData; #define OLDSERXID_PAGESIZE BLCKSZ #define OLDSERXID_ENTRYSIZE sizeof(SerCommitSeqNo) #define OLDSERXID_ENTRIESPERPAGE (OLDSERXID_PAGESIZE / OLDSERXID_ENTRYSIZE) -#define OLDSERXID_MAX_PAGE (SLRU_PAGES_PER_SEGMENT * 0x10000 - 1) + +/* + * Set maximum pages based on the lesser of the number needed to track all + * transactions and the maximum that SLRU supports. + */ +#define OLDSERXID_MAX_PAGE Min(SLRU_PAGES_PER_SEGMENT * 0x10000 - 1, \ + (MaxTransactionId + 1) / OLDSERXID_ENTRIESPERPAGE - 1) #define OldSerXidNextPage(page) (((page) >= OLDSERXID_MAX_PAGE) ? 0 : (page) + 1) |