Automatic expansion

Use the Default Segment Properties Automatic Expansion tab to change the segment and threshold expansion policies. Use the buttons to:

Check – examines current policies and verifies that they are consistent with the current space layout in each segment. If any policy settings appear redundant, ineffective, or incorrect, a warning message appears.
Simulate – simulates the database or device expansion schemes executed at runtime, according to the set of current policies implemented by the set command.

You can perform these cycles of execution as many times as you like, to study the way database and disk expansion operate and to determine what pieces expand, and by how much space.
Execute – performs the database and segment, or device, expansion using the current set of policies.This option performs the expansion process immediately, irrespective of the current free space in the specified segment.

When you select any of the operations – Check, Simulate, or Execute – you do not need to click the OK or Apply buttons to execute the operation; it happens automatically.

You can configure automatic expansion to run with server-wide default expansion policies, or you can customize it for individual segments in specified databases.You can install thresholds on key segments on which tables with critical data reside, allowing you a fine degree of control over how Adaptive Server meets the data space requirements for different kinds of tables. If your site has key tables with large volumes of inserts, these tables can be bound to specific segments, with site-specific rules for extending that segment. This enables you to avoid outages that can occur in a production environment with large loads on such key tables.You cannot use the thresholds to shrink a database or its segment.