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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 

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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. 

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” . 

• session_track_gtids 

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