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Spotlight on SAP ASE 2.12 - Release Notes

Tablespace Analysis drilldown I/O Activity tab

The I/O Activity tab on the Tablespace Analysis drilldown provides a summary of I/O activity on the selected tablespace. The graphs show rates for the following:

  • Reads and writes that use the buffer pool

  • Direct reads and writes, which do not go through the buffer pool, but access the tablespace directly

The bottom of the drilldown lists average I/O times (in milliseconds) for both buffered and direct reads and writes. The average times are shown in milliseconds.

Troubleshooting high I/O activity

On the Database Analysis drilldown, you might notice consistently high rates for the following activities on specific databases:

  • Physical read rates (compared to logical read rates)

  • Synchronous read or write rates

  • Direct I/O rates for a database

These high rates might be indications of performance degradation since the activities involve disk I/O and slow-downs in query processing. Use the graphs listed above to pinpoint those tablespaces on which the high I/O activity is occurring.


The following graphs on the I/O Activity tab keep track of the rates for I/O activity on the selected tablespace. These rates are plotted over consecutive monitoring intervals.

Data Read Rate

Index Read Rate

Index and Data Write Rate

Direct Read and Write Rate



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