diff options
Diffstat (limited to 'src/include/utils/portal.h')
| -rw-r--r-- | src/include/utils/portal.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/include/utils/portal.h b/src/include/utils/portal.h index 098c837e0a1..364fae4b651 100644 --- a/src/include/utils/portal.h +++ b/src/include/utils/portal.h @@ -192,6 +192,14 @@ typedef struct PortalData /* Presentation data, primarily used by the pg_cursors system view */ TimestampTz creation_time; /* time at which this portal was defined */ bool visible; /* include this portal in pg_cursors? */ + + /* + * Outermost ActiveSnapshot for execution of the portal's queries. For + * all but a few utility commands, we require such a snapshot to exist. + * This ensures that TOAST references in query results can be detoasted, + * and helps to reduce thrashing of the process's exposed xmin. + */ + Snapshot portalSnapshot; /* active snapshot, or NULL if none */ } PortalData; /* @@ -235,5 +243,6 @@ extern void PortalCreateHoldStore(Portal portal); extern void PortalHashTableDeleteAll(void); extern bool ThereAreNoReadyPortals(void); extern void HoldPinnedPortals(void); +extern void ForgetPortalSnapshots(void); #endif /* PORTAL_H */ |