IO Screen

The screen refresh rate, in seconds.

The number of DBEnvironment sessions.

The scale used to identify the length of the inverse video bars and the data in the CUR, AVG, and MAX columns. In the example above, the MAX frequency of BUFF ACCESS is 20 per 1.0 second.

The number of page requests issued to the data buffer pool.

The number of pages that are not in the data buffer pool at request time. The operating system must fetch these pages, either from the operating system buffer pool or by a physical disk read.

The number of dirty pages from the data buffer pool that were logically written to disk.

The number of records written to the log buffer pool.

The number of log pages fetched from disk. Unless you have used rollforward recovery, this value is zero. The operating system performs a physical read only if the log page is not found in the operating system buffer pool.

The number of log pages written from the log buffer pool to disk. The operating system performs a physical write for each log buffer write.

The number of checkpoints taken. Checkpoints are performed automatically, when the nonarchive log becomes full, or when you issue a CHECKPOINT command.

The percentage of pages that are not in the data buffer pool at request time. The percentage is calculated as follows:

DATA BUFFER MISS RATE = (DATA DISK RD / BUFF ACCESS) * 100  

The number of data buffer pages configured. To change the number of data buffer pages, issue the START DBE statement or the SQLUtil ALTDBE command.

The number of log buffer pages configured. To change the number of log buffer pages, issue the START DBE statement or the SQLUtil ALTDBE command.

Either ON or OFF, to indicate archive or nonarchive logging.