When set to "1" (on, true, yes), this variable causes all OPEN...WITH LOCK statements to be treated as if they were written OPEN...WITH MASS_UPDATE. This does not apply to OPEN INPUT, however. Setting this configuration variable will improve file performance for applications that lock files, but may lead to file corruption if the program is killed before it completes. For more information on this topic, see the User's Guide, section 6.1.6 "Indexed File Considerations." The default value is "0" (off, false, no).