Server System Variables Type Boolean Default Value OFF Valid Values OFF ON Command-Line Format --select-into-disk-sync-delay=# Introduced 8.0.22 System Variable select_into_disk_sync_delay Scope Global, Session Dynamic Yes SET_VAR  Hint Applies Yes Type Integer Default Value 0 Minimum Value 0 Maximum Value 31536000 Unit milliseconds Command-Line Format --session-track-gtids=value System Variable session_track_gtids Scope Global, Session Dynamic Yes SET_VAR  Hint Applies No Type Enumeration Default Value OFF Valid Values OFF OWN_GTID 873 • session_track_gtids As of MySQL 8.0.26, setting the session value of this system variable is a restricted operation. The session user must have privileges sufficient to set restricted session variables. See Section 5.1.9.1, “System Variable Privileges” . When buffer synchronization of writes to an output file by a long-running  SELECT INTO OUTFILE  or SELECT INTO DUMPFILE  statement is enabled by  select_into_disk_sync , this variable sets an optional delay (in milliseconds) following synchronization.  0  (the default) means no delay. When set on  ON , enables buffer synchronization of writes to an output file by a long-running  SELECT INTO OUTFILE  or  SELECT INTO DUMPFILE  statement using  select_into_buffer_size . • select_into_disk_sync_delay