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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.
Denormalize the data model to improve performanceYou might need to denormalize the data model to reduce overhead and optimize performance.
Expelling long stringsThe most bulky attributes are often character strings. To make the rows shorter, you can remove long strings from the entity table.
Convert CHAR columns into VARCHAR columns to shorten rows (GLS)A database might contain CHAR columns that you can convert to VARCHAR columns. You can use a VARCHAR column to shorten the average row length when the average length of the text string in the CHAR column is at least 2 bytes shorter than the width of the column.

Convert CHAR columns into VARCHAR columns to shorten rows (GLS)

A database might contain CHAR columns that you can convert to VARCHAR columns. You can use a VARCHAR column to shorten the average row length when the average length of the text string in the CHAR column is at least 2 bytes shorter than the width of the column.

VARCHAR data is immediately compatible with most existing programs, forms, and reports. You might need to recompile any forms produced by application development tools to recognize VARCHAR columns. Always test forms and reports on a sample database after you modify the table schema.

For information about other character data types, see the Informix® GLS User's Guide.

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