PostgreSQL Indexes Test
An index is a data structure that a database uses to reduce the amount of time it takes to perform certain operations. An index can also be used to ensure that duplicate values don’t appear where they are not needed.
This test monitors the indexes on the PostgreSQL server and helps administrators quickly and accurately assess the effectiveness of these indexes.
Target of the test : PostgreSQL server
Agent deploying the test: An internal/remote agent
Outputs of the test : One set of results for every index for every table in each database that is configured for monitoring on the target PostgreSQL server
Parameter | Description |
---|---|
Test period |
How often should the test be executed |
Host |
The IP address of the host for which this test is to be configured. |
Port |
The port on which the server is listening. The default port is 5432. |
Username |
In order to monitor a PostgreSQL server, you need to manually create a special database user account in every PostgreSQL database instance that requires monitoring. When doing so, ensure that this user is vested with the superuser privileges. The sample script we recommend for user creation for eG monitoring is: CREATE ROLE eguser LOGIN Specify the name of this user in the Username text box. |
Password |
The password associated with the above Username (can be ‘NULL’). Here, ‘NULL’ means that the user does not have any password. |
Confirm Password |
Confirm the Password (if any) by retyping it here. |
DB Name |
The name of the database to connect to. The default is “postgres”. |
Include DB |
Specify a comma-separated list of databases that you wish to monitor in the Include DB text box. |
Exclude DB |
Specify a comma-separated list of databases that need to be excluded from monitoring in the Exclude DB text box. By default, this is set to rdsadmin. Note: If you are monitoring a PostgreSQL server hosted on AWS cloud, then make sure that you do not remove 'rdsadmin' from the Exclude DB list. |
SSL |
If the PostgreSQL server being monitored is an SSL-enabled server, then set the SSL flag to Yes. If not, then set the SSL flag to No. |
Detailed Diagnosis |
To make diagnosis more efficient and accurate, the eG Enterprise embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option. The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:
|
Measurement | Description | Measurement Unit | Interpretation |
---|---|---|---|
Index scans: |
Indicates the rate at which the index scans are initiated on this index in this database . |
Scans/Sec |
|
Rows read: |
Indicates the rate at which the index entries (rows) are read during the index scans on this index. |
Reads/Sec |
|
Rows fetched: |
Indicates the rate at which the rows are fetched from this index upon execution of a query. |
Fetches/Sec |
If the value of this measure is greater than the value of the Rows read measure, it indicates a possibility of index fragmentation or that the executed query is inefficient. |