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OpenAdmin Tool: Use Heat Map Graphs to monitor Extent and Buffer Pool Usage
OpenAdmin Tool (OAT) version 3.11 includes new Heat Map graphs to aid in the performance analysis of your Informix database server. View extent and buffer pool usage in a heat map, also known as a treemap graph.
Go to the new Performance Analysis > System Reports > Graphs page to view graphs of the number of extents in databases or the percentage of cached pages in the buffer pools. Use the drop-down controls at the top of the page to choose the type of data to graph (extents or buffer pool) and to filter by a particular database.
Extents Heat Map
Use the Extents graph to monitor the number of extents across your databases. Monitoring extents is important because a large number of extents can impact performance by requiring the database server to spend extra time finding the data.
Use the size and color cues for each object to interpret the extents graph. Each rectangle within a database represents an object, for example a table or an index. The size of the rectangle indicates the relative size of the object. The color indicates the number of extents as indicated by the legend for the graph. Hover over any object in the graph to see the number of extents and the number of total pages used.
If any table or index has a large number of extents, consider increasing the size of the extents to improve performance.
Screenshots 1 and 2 show examples of the Extents Heat Map in OAT.
Screenshot 1: Extents Heat Map for the sysadmin database
Screenshot 2: Extents Heat Map for all databases
Buffer Pool Heat Map
Use the Buffer Pool graph to monitor the cached pages in your buffer pool. Both the size of the buffer pool and which table and indexes pages are cached in the buffer pool can have a big impact on the performance of queries against the database server.
Use the size and color cues for each object to interpret the buffer pool graph. Each rectangle within a database represents an object, for example a table or an index. The size of the rectangle indicates the relative size of the object. The color indicates the percentage of pages that are cached as indicated by the legend for the graph. Red indicates a “hot” table or index that has 100% of its pages cached in the buffer pool, whereas blue indicates a “cold” table or index that has 0% of its pages cached. Hover over any object in the graph to see the total rows, total pages, buffered pages, and percentage of pages that are cached for that object.
A higher percentage of cached pages can improve performance. Queries that are run on tables with a high cache percentage are faster than queries that are run on tables with a low cache percentage. If a table has a low percentage of cached pages and queries are slow, consider increasing the size of the buffer pool.
Screenshots 3 and 4 show examples of the Buffer Pool Heat Map in OAT.
Screenshot 3: Buffer Pool Heat Map for the sysadmin database
Screenshot 4: Buffer Pool Heat Map for all databases
For more information about the OpenAdmin Tool and the new features in version 3.11, go to the OpenAdmin Tool webpage.
- Erika Von Bargen
