On Linux and UNIX operating systems, this option defines the name of the
instance to use for cataloged database connections. If this option is set,
its value overrides the DB2INSTANCE environment variable setting.
This option is ignored on Windows operating systems.
This option overrides i5 db2_connect full open and close in the PHP
application. When ibm_db2.i5_all_pconnect = 1, all db2 connections
become persistent (db2_pconnect). On i5/OS, db2_pconnect performs
dramatically better with lower machine stress over db2_connect. This
is a convenience override of db2_connect to evoke db2_pconnect without
PHP source code changes.
0 db2_connect default full open and close
1 db2_connect override to db2_pconnect for persistent connection only