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AdministeringIn addition to administering the database server, you can tune performance, replicate data, and archive data.
System administrationThese topics contain concepts, procedures, and reference information for database and database server administrators to use for managing and tuning HCL Informix® database servers.
Administrator's ReferenceThe includes comprehensive descriptions of HCL Informix® configuration parameters, the system-monitoring interface (SMI) tables in the sysmaster database, the syntax of database server utilities such as onmode and onstat, logical-log records, disk structures, event alarms, and unnumbered error messages.
Configuring and monitoring Informix®
Disk Structures and Storage
Dbspace Structure and Storage
Structure and Storage of a Dbspace Page
Data-Row Format and Storage
Page Compression

Page Compression

Over time, the free space on a page can become fragmented. When the database server attempts to store data, it first checks row length against the number of free bytes on a page to determine if the row fits. If adequate space is available, the database server checks if the page contains adequate contiguous free space to hold the row (or row portion). If the free space is not contiguous, the database server calls for page compression.

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