Managing for performance

The Device Size dialog is invoked by the database wizard, and allows you to specify the device and its size for your database. The options are:

Data – is the device on which to store the database.
Transaction Log – is the device for the transaction log.
Size – is the size you would like to specify for your device. You can set different amounts of space for each of several devices.

For more information, see create database in the Reference Manual: Commands.

Separation is the key to maximizing performance through storage management. The following separations can improve performance:

Placing a table on one physical disk and nonclustered indexes on another ensures that physical reads and writes are faster, since the work is split between two disk drives.
Splitting large tables across two physical disks can improve performance, especially for multi-user applications.
Placing a database or object on one physical disk and its mirror on another reduces read time, since both devices are active. On the other hand, mirroring a device increases the time needed to write, because Adaptive Server writes transactions to both the database device and its mirror.

If you use Adaptive Server Enterprise Monitor at your installation, you may find it useful to run it with Adaptive Server to examine how performance is affected by changes in physical storage allocations.