gp_backup_directIO
Direct I/O allows Greenplum Database to bypass the buffering of memory within the file system cache for backup. When Direct I/O is used for a file, data is transferred directly from the disk to the application buffer, without the use of the file buffer cache.
Direct I/O is supported only on Red Hat Enterprise Linux, CentOS, and SUSE.
Value Range | Default | Set Classifications |
---|---|---|
on, off | off | local session reload |