In the first of my posts regarding development of an UNIX/Linux Cross-Platform management pack for monitoring of Oracle, I described the creation of two custom probe action modules for WSMan Invoke Action and Shell Command Execution operations.  In this post, I will describe the creation of a third custom Probe Action for executing SQL queries locally with sqlplus.  It was a bit of a challenge to get this probe action functioning the way I had intended, but after some trial and error, it does seem to work quite nicely.  The SQL Query probe action is really  just a convenient wrapper for the previously discussed ShellCommand probe action.