[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] o type specifier object data type OCT() function 2nd 3rd OCTET LENGTH() function One to many mapping DNS (domain name server) virtual hosting One to one mapping DNS (domain name server) virtual hosting one-to-many relationships 2nd one-to-one relationships 2nd opendir() function opening directories files 2nd 3rd OpenSSL Web site openssl command-line tool (certificates) OpenSSL library installing UNIX Windows installing (SSL installations) 2nd openssl.exe utility OpenSSL library operands combined with operators defined operating systems MySQL optimization tips operating systems (OS) scalability 2nd operators addition (+) arithmetic operators 2nd assignment (=) 2nd 3rd combined assignment operators 2nd 3rd 4th comparison operators 2nd concatentation (.) 2nd 3rd defined 2nd logical 2nd 3rd operands combined with post-decrement 2nd 3rd 4th post-increment 2nd 3rd 4th precedence 2nd 3rd 4th operators. [See also expressions] OPTIMIZE TABLE command 2nd 3rd optional arguments example 2nd 3rd options apache.exe server binary (Windows) Options directive value options httpd server binary (Unix) Options directive parameters Options directive (mass virtual hosting) or operator (||) 2nd 3rd 4th 5th 6th ORDER BY clause 2nd 3rd Order directive control access rules evaluating Order directives Allow, Deny argument Deny, Allow argument Mutual-Failure argument OS (operating systems) scalability 2nd output() function 2nd override schemas directives ownership verifying |