Script to check Data Guard status from SQL

In a previous blog post I have explained how to get the basic configuration from x$drc and display something like:

There are other possibilities, by using the DBMS_DRS PL/SQL package.

The package is quite rich. In order to get more details, I use CHECK_CONNECT to check the connectivity to the member databases:

example:

In the first case I get no exceptions, that means that the database is reachable using the DGConnectIdentifier specified in the configuration (‘TOOLCDB1_SITE2’ is my database name in the configuration, it is NOT a TNS entry. I use EZConnect in my lab).

In the second case I specify a database that is not in the configuration.

In the third case, it looks like the database is down (no service), or the DGConnectIdentifier is not correct.

 

GET_PROPERTY_OBJ is useful to get e single property of a database/instance:

Example:

Here I have, for the primary (the object_id from x$drc), a TransportLagThreshold of 30 seconds.

DO_CONTROL does a specific check and returns a document with the results:

The problem is… what’s the format for indoc?

To get the correct format, I have enabled sql trace to get the executions, with bind variables, of the dgmgrl commands. It happens that the input format is XML and the output format is HTML.

This is how you can get the LogXptStatus, for example:

 

The big script

So I said… why not trying to have a comprehensive SQL script to check a few vital statuses of Data Guard?

This is the script that came out:

Of course, it is not perfect (many checks missing: FSFO readiness, observer checks, etc.), but it is good enough for base monitoring. Also, it’s faster than a normal shell+dgmgrl script.

Output on a Primary database:

Output on a standby database:

In case of errors (e.g. standby listener stopped), I would get:

So easy to spot the error and use a shell wrapper to grep ^ERROR or similar.

Be careful, the script is not RAC aware, and it lacks some checks, so you might want to reuse it and extend it to fit your exact configuration.

Hope you like it!

Ludovico

The following two tabs change content below.

Ludovico

Principal Product Manager at Oracle
Ludovico ia a member of the Oracle Database High Availability (HA), Scalability & Maximum Availability Architecture (MAA) Product Management team in Oracle. He focuses on Fleet Patching and Provisioning (FPP), MAA-optimized software lifecycle management, Cloud MAA and Online Operations.

2 thoughts on “Script to check Data Guard status from SQL

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.