IO

The "IO" window shows information about the Physical and logical IOs.

Cache hit ratio (%)

Indicates how effectively the Informix database is using memory cache. Both read and write cache rates should be in the 80 to 90th percentile. Low rates indicate Informix is doing a lot more disk reads and writes than it should. If the values are lower than 80%, you need to consider increasing the value of the BUFFERS paramter in your Informix Configuration file to achieve higher read and write cache rates.

Read Read cache rate
Write Write cache rate

IOs per second

Physical reads Number of disk reads per second
Physical writes Number of disk writes per second
Buffer reads Number of buffer reads from cache per second
Buffer writes Number of buffer writes cache per second

DBspace IO

The grid located at the middle of the window shows each individual dbspace with the following information for each one:

Dbspace I/O is measured by disk reads and writes. If some dbspaces have heavy disk reads and writes while others scarcely have any, then the system may have some disk I/O bottlenecks. A well-balanced dbspace I/O will ease system disk I/O loads and, hence improve overall system performance.

If disk reads and writes are extremely high for some dbspaces and extremely low for others, you may need to adjust or even rearrange your physical disk layout for Informix engine.

Name DBspace name
Path Path name
Disk reads /s Disk reads per second
Disk writes /s Disk writes per second

By default, the last snapshot is displayed in the grid. Use the slidder (or the arrow buttons) located at the top of the grid to navigate through the collected snapshots. In monitoring, the "Update" button must be unchecked to be able to navigate through the collected snapshots.

Select one or more dbspaces in the grid (Check box at the left of the grid) to update the graphes located at the bottom of the window. If several dbspaces are selected, the statistics are aggregated.

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