diff --git a/src/backend/storage/ipc/dsm.c b/src/backend/storage/ipc/dsm.c
index 4ee453e..11c913a 100644
--- a/src/backend/storage/ipc/dsm.c
+++ b/src/backend/storage/ipc/dsm.c
@@ -42,6 +42,7 @@
 #include "utils/guc.h"
 #include "utils/memutils.h"
 #include "utils/resowner_private.h"
+#include "postmaster/postmaster.h"
 
 #define PG_DYNSHMEM_STATE_FILE			PG_DYNSHMEM_DIR "/state"
 #define PG_DYNSHMEM_NEW_STATE_FILE		PG_DYNSHMEM_DIR "/state.new"
@@ -886,6 +887,52 @@ dsm_keep_mapping(dsm_segment *seg)
 }
 
 /*
+ * Keep a dynamic shared memory segment until end of postmaster.
+ *
+ * By default, segments are owned by the current resource owner, which
+ * typically means they stick around for the duration of the current query
+ * only.
+ */
+void
+dsm_keep_segment(dsm_segment *seg)
+{
+	/*
+	 * Bump reference count for this segment in shared memory. This will
+	 * ensure that even if there is no session which is attached to this
+	 * segment, it will stay till postmaster lifetime. For windows, we
+	 * need to duplicate segment handle for postmaster process, as it
+	 * automatically drops segment if all referring sessions end.
+	 */
+	LWLockAcquire(DynamicSharedMemoryControlLock, LW_EXCLUSIVE);
+	dsm_control->item[seg->control_slot].refcnt++;
+	LWLockRelease(DynamicSharedMemoryControlLock);
+
+#ifdef WIN32
+	{
+		HANDLE		hmap2;
+
+		if (!DuplicateHandle(GetCurrentProcess(),
+			seg->impl_private,
+			PostmasterHandle,
+			&hmap2,
+			0,
+			FALSE,
+			DUPLICATE_SAME_ACCESS))
+		{
+			char		name[64];
+
+			snprintf(name, 64, "Global/PostgreSQL.%u", seg->handle);
+			_dosmaperr(GetLastError());
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					errmsg("could not retain segment \"%s\" for postmaster lifetime: %m",
+						   name)));
+		}
+	}
+#endif
+}
+
+/*
  * Find an existing mapping for a shared memory segment, if there is one.
  */
 dsm_segment *
diff --git a/src/include/storage/dsm.h b/src/include/storage/dsm.h
index 71901bf..16afef3 100644
--- a/src/include/storage/dsm.h
+++ b/src/include/storage/dsm.h
@@ -30,6 +30,7 @@ extern void dsm_detach(dsm_segment *seg);
 
 /* Resource management functions. */
 extern void dsm_keep_mapping(dsm_segment *seg);
+extern void dsm_keep_segment(dsm_segment *seg);
 extern dsm_segment *dsm_find_mapping(dsm_handle h);
 
 /* Informational functions. */