SQL Uptime Test
In most production environments, it is essential to monitor the uptime of critical database instances in the infrastructure. By tracking the uptime of each of the database instances, administrators can determine what percentage of time a database instance has been up. Comparing this value with service level targets, administrators can determine the most trouble-prone areas of the infrastructure.
In some environments, administrators may schedule periodic reboots of their database instance. By knowing that a specific database instance has been up for an unusually long time, an administrator may come to know that the scheduled reboot task is not working on a database instance.
This SQL Uptime test monitors the uptime of the target Microsoft SQL database instance.
Note:
This test is applicable only to Microsoft SQL Server version 2008 and above.
Target of the test : A Microsoft SQL server
Agent deploying the test : An internal agent
Outputs of the test : One set of results for every Microsoft SQL server being monitored
|
Measurement | Description | Measurement Unit | Interpretation |
---|---|---|---|
Has SQL server been restarted?: |
Indicates whether the database instance has been rebooted during the last measurement period or not. |
Boolean |
If the value of this measure is Yes, it means that the database instance was rebooted during the last measurement period. By checking the time periods when this metric changes from No to Yes, an administrator can determine the times when this database instance was rebooted. The Detailed Diagnosis of this measure, if enabled, lists the TIME, SHUTDOWN DATE, RESTART DATE, SHUTDOWN DURATION, and IS MAINTENANCE. |
Uptime since the last measurement: |
Indicates the time period that the database instance has been up since the last time this test ran. |
Secs |
If the database instance has not been rebooted during the last measurement period and the agent has been running continuously, this value will be equal to the measurement period. If the database instance was rebooted during the last measurement period, this value will be less than the measurement period of the test. For example, if the measurement period is 300 secs, and if the database instance was rebooted 120 secs back, this metric will report a value of 120 seconds. The accuracy of this metric is dependent on the measurement period – the smaller the measurement period, greater the accuracy. |
Uptime: |
Indicates the total time that the database instance has been up since its last reboot. |
Mins |
This measure displays the number of years, months, days, hours, minutes and seconds since the last reboot. Administrators may wish to be alerted if the database instance has been running without a reboot for a very long period. Setting a threshold for this metric allows administrators to determine such conditions. |