diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/transam/multixact.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c index e75e1fdf740..fe6698d5ffa 100644 --- a/src/backend/access/transam/multixact.c +++ b/src/backend/access/transam/multixact.c @@ -261,7 +261,7 @@ typedef struct MultiXactStateData * we compute it (using nextMXact if none are valid). Each backend is * required not to attempt to access any SLRU data for MultiXactIds older * than its own OldestVisibleMXactId[] setting; this is necessary because - * the checkpointer could truncate away such data at any instant. + * the relevant SLRU data can be concurrently truncated away. * * The oldest valid value among all of the OldestMemberMXactId[] and * OldestVisibleMXactId[] entries is considered by vacuum as the earliest @@ -669,8 +669,8 @@ MultiXactIdSetOldestMember(void) * * We set the OldestVisibleMXactId for a given transaction the first time * it's going to inspect any MultiXactId. Once we have set this, we are - * guaranteed that the checkpointer won't truncate off SLRU data for - * MultiXactIds at or after our OldestVisibleMXactId. + * guaranteed that SLRU data for MultiXactIds >= our own OldestVisibleMXactId + * won't be truncated away. * * The value to set is the oldest of nextMXact and all the valid per-backend * OldestMemberMXactId[] entries. Because of the locking we do, we can be |