Jet Profiler Tour

Jet Profiler is a great tool to pinpoint performance problems in MySQL databases.

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Screenshot showing a list of the top queries

Top Queries

The screenshot shows a sequence of 8 minutes of test load, with peaks every 90 seconds. The upper line chart diagram shows Threads, number of total connected threads in light blue and number of running threads (executing queries) in dark blue. The red area indicates how many slow queries are running. The Top Queries table shows which queries are most frequently observed along with a rating based on EXPLAIN. This view is the most important tool to find the worst performing queries.

Screenshot showing top users

Top Users

This screenshot shows a comparison of the different users. Both the line chart and pie chart diagrams indicate that the heavybid user is the most frequent user. If running in a multi-user environment, this can be a quick way to determine if a particular user is overrepresented.

Screenshot showing top used tables

Top Tables

This view, Top Tables, shows what tables are used most frequently. The table heavybidder.user from our test application causes about 40% of the load. Sometimes, this can be the best way to determine which parts of the database are worst performing - tables lacking proper indices.

Screenshot showing query rating and explain

Query ratings

The Explain Dialog shows a visualization of the query execution plan. A query rating shows if the query is well written and uses indices correctly. You can edit the query and rerun the EXPLAIN command to see if you can improve it.


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