diff --git i/src/include/access/transam.h w/src/include/access/transam.h
index e37ecb52fa1..2b46d2b76a0 100644
--- i/src/include/access/transam.h
+++ w/src/include/access/transam.h
@@ -183,6 +183,8 @@ typedef struct VariableCacheData
 	TransactionId latestCompletedXid;	/* newest XID that has committed or
 										 * aborted */

+	uint64 csn;
+
 	/*
 	 * These fields are protected by CLogTruncationLock
 	 */
diff --git i/src/include/utils/snapshot.h w/src/include/utils/snapshot.h
index 2bc415376ac..389f18cf8a5 100644
--- i/src/include/utils/snapshot.h
+++ w/src/include/utils/snapshot.h
@@ -207,6 +207,8 @@ typedef struct SnapshotData

 	TimestampTz whenTaken;		/* timestamp when snapshot was taken */
 	XLogRecPtr	lsn;			/* position in the WAL stream when taken */
+
+	uint64		csn;
 } SnapshotData;

 #endif							/* SNAPSHOT_H */
diff --git i/src/backend/storage/ipc/procarray.c w/src/backend/storage/ipc/procarray.c
index 617853f56fc..520a79c9f73 100644
--- i/src/backend/storage/ipc/procarray.c
+++ w/src/backend/storage/ipc/procarray.c
@@ -65,6 +65,7 @@
 #include "utils/snapmgr.h"

 #define UINT32_ACCESS_ONCE(var)		 ((uint32)(*((volatile uint32 *)&(var))))
+#define UINT64_ACCESS_ONCE(var)		 ((uint64)(*((volatile uint64 *)&(var))))

 /* Our shared memory area */
 typedef struct ProcArrayStruct
@@ -266,6 +267,7 @@ CreateSharedProcArray(void)
 		procArray->lastOverflowedXid = InvalidTransactionId;
 		procArray->replication_slot_xmin = InvalidTransactionId;
 		procArray->replication_slot_catalog_xmin = InvalidTransactionId;
+		ShmemVariableCache->csn = 1;
 	}

 	allProcs = ProcGlobal->allProcs;
@@ -404,6 +406,8 @@ ProcArrayRemove(PGPROC *proc, TransactionId latestXid)
 		if (TransactionIdPrecedes(ShmemVariableCache->latestCompletedXid,
 								  latestXid))
 			ShmemVariableCache->latestCompletedXid = latestXid;
+		/* Same with CSN */
+		ShmemVariableCache->csn++;

 		ProcGlobal->xids[proc->pgxactoff] = 0;
 		ProcGlobal->nsubxids[proc->pgxactoff] = 0;
@@ -531,6 +535,7 @@ ProcArrayEndTransactionInternal(PGPROC *proc, TransactionId latestXid)
 {
 	size_t		pgxactoff = proc->pgxactoff;

+	Assert(LWLockHeldByMe(ProcArrayLock));
 	Assert(TransactionIdIsValid(ProcGlobal->xids[pgxactoff]));
 	Assert(ProcGlobal->xids[pgxactoff] == proc->xidCopy);

@@ -561,6 +566,9 @@ ProcArrayEndTransactionInternal(PGPROC *proc, TransactionId latestXid)
 	if (TransactionIdPrecedes(ShmemVariableCache->latestCompletedXid,
 							  latestXid))
 		ShmemVariableCache->latestCompletedXid = latestXid;
+
+	/* Same with CSN */
+	ShmemVariableCache->csn++;
 }

 /*
@@ -1637,7 +1645,7 @@ GetSnapshotData(Snapshot snapshot)
 	TransactionId oldestxid;
 	int			mypgxactoff;
 	TransactionId myxid;
-
+	uint64		csn;
 	TransactionId replication_slot_xmin = InvalidTransactionId;
 	TransactionId replication_slot_catalog_xmin = InvalidTransactionId;

@@ -1675,6 +1683,26 @@ GetSnapshotData(Snapshot snapshot)
 					 errmsg("out of memory")));
 	}

+#if 1
+	if (snapshot->csn != 0 && MyProc->xidCopy == InvalidTransactionId &&
+		UINT64_ACCESS_ONCE(ShmemVariableCache->csn) == snapshot->csn)
+	{
+		if (!TransactionIdIsValid(MyProc->xmin))
+			MyProc->xmin = TransactionXmin = snapshot->xmin;
+		RecentXmin = snapshot->xmin;
+		Assert(TransactionIdPrecedesOrEquals(TransactionXmin, RecentXmin));
+
+		snapshot->curcid = GetCurrentCommandId(false);
+		snapshot->active_count = 0;
+		snapshot->regd_count = 0;
+		snapshot->copied = false;
+		snapshot->lsn = InvalidXLogRecPtr;
+		snapshot->whenTaken = 0;
+
+		return snapshot;
+	}
+#endif
+
 	/*
 	 * It is sufficient to get shared lock on ProcArrayLock, even if we are
 	 * going to set MyProc->xmin.
@@ -1687,6 +1715,7 @@ GetSnapshotData(Snapshot snapshot)

 	nextfxid = ShmemVariableCache->nextFullXid;
 	oldestxid = ShmemVariableCache->oldestXid;
+	csn = ShmemVariableCache->csn;

 	/* xmax is always latestCompletedXid + 1 */
 	xmax = ShmemVariableCache->latestCompletedXid;
@@ -1941,6 +1970,8 @@ GetSnapshotData(Snapshot snapshot)
 	snapshot->regd_count = 0;
 	snapshot->copied = false;

+	snapshot->csn = csn;
+
 	if (old_snapshot_threshold < 0)
 	{
 		/*
diff --git i/src/backend/utils/time/snapmgr.c w/src/backend/utils/time/snapmgr.c
index 41914f1a6c7..9d8ebe51307 100644
--- i/src/backend/utils/time/snapmgr.c
+++ w/src/backend/utils/time/snapmgr.c
@@ -604,6 +604,8 @@ SetTransactionSnapshot(Snapshot sourcesnap, VirtualTransactionId *sourcevxid,
 	CurrentSnapshot->takenDuringRecovery = sourcesnap->takenDuringRecovery;
 	/* NB: curcid should NOT be copied, it's a local matter */

+	CurrentSnapshot->csn = 0;
+
 	/*
 	 * Now we have to fix what GetSnapshotData did with MyPgXact->xmin and
 	 * TransactionXmin.  There is a race condition: to make sure we are not
@@ -679,6 +681,7 @@ CopySnapshot(Snapshot snapshot)
 	newsnap->regd_count = 0;
 	newsnap->active_count = 0;
 	newsnap->copied = true;
+	newsnap->csn = 0;

 	/* setup XID array */
 	if (snapshot->xcnt > 0)
@@ -2180,6 +2183,7 @@ RestoreSnapshot(char *start_address)
 	snapshot->curcid = serialized_snapshot.curcid;
 	snapshot->whenTaken = serialized_snapshot.whenTaken;
 	snapshot->lsn = serialized_snapshot.lsn;
+	snapshot->csn = 0;

 	/* Copy XIDs, if present. */
 	if (serialized_snapshot.xcnt > 0)