The READSEMA option specifies whether the system attempts to gain a semaphore for shared files when I/O operations are performed that do not modify the file.
READSEMA={ON|OFF}
ON | Attempt to gain a semaphore for every file operation, including READ and START operations. |
OFF | Do not attempt to gain a semaphore for shared files during operations such as READ and START. |
Default: | OFF |
Where a file is being read by multiple users, to enhance throughput set this parameter to OFF.