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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.
Performance GuideThe Informix® Performance Guide describes how to configure and operate your HCL Informix® database server to improve overall system throughput and to improve the performance of SQL queries.
Table performance considerationsSome performance issues are associated with unfragmented tables and table fragments.
Placing tables on diskTables that the database server supports reside on one or more portions of one or more disks. You control the placement of a table on disk when you create it by assigning it to a dbspace.
Using multiple disksYou can use multiple disks for dbspaces, logical logs, temporary tables, and sort files.
Using multiple disks for a dbspace Using multiple disks for a dbspace helps to distribute I/O across dbspaces that contain several small tables.

Using multiple disks for a dbspace

Using multiple disks for a dbspace helps to distribute I/O across dbspaces that contain several small tables.

A dbspace can include multiple chunks, and each chunk can represent a different disk. The maximum size for a chunk is 4 terabytes. This arrangement allows you to distribute data in a dbspace over multiple disks. A dbspace distributed over three disks shows a dbspace distributed over three disks.

This figure is described in the surrounding text. — Figure 1: A dbspace distributed over three disks

Because you cannot use this type of distributed dbspace for parallel database queries (PDQ), you should use the table-fragmentation techniques described in Distribution schemes to partition large, high-use tables across multiple dbspaces.

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