Tuning the Instance Viewer in Oracle SQL Developer

thatjeffsmith SQL Developer 9 Comments

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Remember this fancy do-hickey?

This is COOL :)

This is COOL 🙂

It’s the Instance Viewer. We introduced it as a new feature in version 4.1.

For version 4.2, we added this – the Top SQL panel.

Instance Viewer can flip from storage/IO stuff to Top SQL.

Instance Viewer can flip from storage/IO stuff to Top SQL.

We ask the database every 10 seconds what the most expensive query by CPU is. Maybe that’s a bit too aggressive for you?

What if you only wanted to ask every…10 minutes?

You can do this.

View - Metrics Console

View – Metrics Console

You’ll want the Instance Viewer to be open and running, or the Metrics Console won’t display anything.

In the panel, select your connection and expand the Tree.

Look for your metric – the Top SQL one is easy to find 🙂

Right click, ‘Edit…’

Select your new time period.

I'm going to once a minute.

I’m going to once a minute.

Click ‘Ok’ and you’ll get a confirmation message, and you’re done.

This Is Also Available for Real Time SQL Monitoring

This is a brand new page we built for v4.2.

Maybe you don’t want to be so aggressive on updating the RTSM report details?

The more frequently you hit, the more CPU you'll use client side and the more work you're creating on the database side - nothing is free.

The more frequently you hit, the more CPU you’ll use client side and the more work you’re creating on the database side – nothing is free.

One Last Word on the Instance Viewer

There is another way to configure it.

Maybe you want to see more than the last 30 seconds of activity in the graphs? You could set it up to show the last 2 hours of IO.

Or, maybe you want to split the queries we’re running from one connection to 5 connections?

You can set both of these in the Preferences.

Bumping up the connection pool = MORE SQL Developer connections.

Bumping up the connection pool = MORE SQL Developer connections.

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Comments 9

  1. Hi Jeff,

    One thing I noticed on the Top SQL window is the sorts default to the opposite of what would be most useful.

    For instance when I click on Executions it sorts lowest to highest. So I get a bunch of queries with 0 executions. What I usually worry about is the queries with the MOST executions, so I need to click on the column again.

    Same for CPU Secs, DiskReads and most of the other columns.

    I’s also not always sure what the column means. Executions since when? When I go to Details for a query the elapsed time / execution history does not match the executions column.

    Is this view used somewhere else that I can find documentation for?

    Thanks,

    Jim

    1. thatjeffsmith Post
      Author

      agreed, default sort should be DESC

      the metrics are just the current values of the associated v/gv$ views…we hit those every X seconds and display the values on the chart…i think teh default window for the chart itself is a few minutes

      if you look at view > Log > statements you can see what we’re firing to populate the charts and reports

  2. Thanks for the new features. The comments I get from the TOADSTERS are that it’s like drinking from a fire hose. Could you drill down into several of the metrics with some examples, why a particular column might be important to developers or DBA’s. If you don’t have time for such a discussion we understand, everyone needs to sleep. Great new feature! Thanks

    1. thatjeffsmith Post
      Author
  3. Hi Jeff
    the Instance Viewer is cool and everything.
    But it looks like it is using all of the database resources as it crashes other running applications based on Oracle Forms.
    I tried to reduce the refresh interval but with no luck.
    I am on Oracle 11.2.04 and SQL-Developer ea 4.2.0.16.260

    1. thatjeffsmith Post
      Author

      It does issue a ton of queries, over a short amount of time. And will refresh as you keep the screen open. You can see these go across the JDBC driver in View > Log > Statements.

      Maybe your data dictionary stats are stale?

      1. I have reissued the following statements just now and still I am getting the same results.
        EXEC DBMS_STATS.GATHER_SCHEMA_STATS (‘SYS’);
        exec DBMS_STATS.GATHER_DATABASE_STATS (gather_sys=>TRUE);
        EXEC DBMS_STATS.GATHER_DICTIONARY_STATS;
        EXEC DBMS_STATS.GATHER_FIXED_OBJECTS_STATS;

        After some seconds of activity of the Instance Viewer my Oracle Forms applet is crashing. Never seen something like this before

        1. thatjeffsmith Post
          Author

          I’d hate to make another guess and be wrong. Can you elaborate on the nature of your Forms crash? Any error messages?

          SQL Developer is just running queries…If you forced me to guess again I’d say temp space or SGA resources are being exhausted.

          1. I tried some more debugging and tracing.
            The Instance Viewer is crashing my Firefox Browser running the Oracle Forms Applet only if both programs are running on the same client.
            So to me it looks like some Java, Cache, whatsoever problem on the client side.
            I am on a vm running Windows 10 with Java 1.8.111 installed.
            The Java Console is not showing any errors.

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