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Knowledge Base

Watch4net: What is the data_property_flat table in the APG database and how is it used? (317426)

Last Updated: 5/29/2020Categories: How toTotal Views: 16548Language:
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What is data_property_flat table used for in the Watch4net APG database?

Is it safe to delete (drop) the data_property_flat table?

How often is the data_property_flat table recreated?

How do I manually recreate data_property_flat table?

The data_property_flat table is an optimized view of the data_property table. The data_property_flat table is used for improving the performance when generating the reports. Dropping this table will not impact the information collected in the data_property table.

How and when the data_property_flat table is recreated
The recreate-data-property-flat-Default task is responsible for recreating the data_property_flat table. By default, the table is recreated every 6 hours.

The interval for recreating the data_property_flat table is configurable in the recreate-data-property-flat-Default task configuration file found here:

data/task_repository/mysql-maintenance-tool/Default/recreate-data-property-flat.task

You can check the table recreation time interval in the task configuration file, and you can also check this interval in the Watch4net Centralized Management interface here:

Scheduled task > recreate-data-property-flat-Default

The following shows example output from this dialog in the Centralized Management interface, which shows that the task runs every 6 hours:

Task Name:  recreate-data-property-flat-Default

Current Status:  idle

Next Run Scheduled at:  Jun 21, 2013 1:00:00 PM

Last Launch:  Jun 21, 2013 7:00:00 AM

Last Result:  last execution was successful

Last Successful Completion:  Jun 21, 2013 7:00:09 AM

Last Error Encountered:  -

Last Run Duration:  9s 162ms

Average Duration:  6s 66ms   over   95 runs

Task configuration for recreating the data_property_flat table
In the recreate-data-property-flat-Default task configuration file (data/task_repository/mysql-maintenance-tool/Default/recreate-data-property-flat.task), you can see that the task runs a cron job on the recreate-data-property.sh in the time interval as defined.

<?xml version="1.0" encoding="UTF-8"?>

<!-- Scheduled task for the maintenance of APG database. --><!-- Recreate data_property_flat table. --><task xmlns="http://www.watch4net.com/Tools/Scheduler/Tasks" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" category="Database" name="recreate-data-property-flat-Default" xsi:schemaLocation="http://www.watch4net.com/Tools/Scheduler/Tasks task.xsd">

<!-- task running every 6 hours starting at 1h00 each day. -->

<schedule cron="0 1,7,13,19 * * *" xsi:type="schedule-repeated" disabled="false"></schedule>

Manually recreating the data_property_flat table
This recreate-data-property-flat-Default task is configured to run the recreate-data-property.sh script located in /opt/apg/bin. To manually recreate this table, all you need to do is run this script.

Related Information

Commands:

To delete/drop the table from mySQL database:

mysql> drop table data_property_flat;

To delete only the contents of this table from mySQL database:

mysql> truncate data_property_flat;

To manually create the data_property_flat table:

[root@hostname bin]$ pwd

/opt/APG/bin

[root@hostname bin]$ ./recreate-data-property.sh

Below is a screenshot of UI to check the recreate-data-property-flat.task and config file.

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