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<h1>11. Data Replication, Synchronization and Transformation Services</h1>
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<h2>11.4. Virtuoso scheduler</h2>
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Virtuoso scheduler allows an arbitrary SQL command to be run at certain intervals.
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The scheduler process wakes up every n minutes, scans the SYS_SCHEDULED_EVENT table and
executes each command which applies to the current time. Note that overdue commands are executed
only once.
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There is a virtuoso.ini parameter "SchedulerInterval" under
<a href="sect5_ini_Parameters.html">Parameters</a> section which defines the scheduler wake-up interval.
Set this to 0 (the default) to disable the scheduler.
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<h3>11.4.1. SYS_SCHEDULED_EVENT</h3>
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<pre class="programlisting">
CREATE TABLE SYS_SCHEDULED_EVENT(
SE_NAME varchar,
SE_START datetime,
SE_SQL varchar,
SE_LAST_COMPLETED datetime,
SE_INTERVAL integer,
PRIMARY KEY(SE_NAME));
</pre>
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<p>
This table describes each scheduled SQL command. SE_NAME is the name of the scheduled event.
SE_START is the first schedule execution time.
SE_SQL is the text of the SQL command to be executed.
SE_LAST_COMPLETED is the last time when the SQL command was executed successfully.
SE_INTERVAL is the interval between the runs of the SQL command in minutes.
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Defining a new scheduled event means adding a row to the SYS_SCHEDULED_EVENT with an insert statement like this:
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INSERT INTO SYS_SCHEDULED_EVENT (SE_NAME, SE_SQL, SE_START, SE_INTERVAL)
VALUES (.....)
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