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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.
Queries and the query optimizerThese topics describe query plans, explain how the database server manages query optimization, and discuss factors that you can use to influence the query plan. These topics also describe performance considerations for SPL routines, the UDR cache, and triggers.
The query planThe query optimizer evaluates the different ways in which a query might be performed and determines the best way to select the requested data. During this evaluation, the optimizer formulates a query plan to fetch the data rows that are required to process a query.
XML query plans in Data StudioData Studio consists of a set of tools to use for administration, data modeling, and building queries from data that comes from data servers. The EXPLAIN_SQL routine prepares a query and returns a query plan in XML. The Data Studio Administration Edition can use the EXPLAIN_SQL routine to obtain a query plan in XML format, interpret the XML, and render the plan visually.

XML query plans in Data Studio

Data Studio consists of a set of tools to use for administration, data modeling, and building queries from data that comes from data servers. The EXPLAIN_SQL routine prepares a query and returns a query plan in XML. The Data Studio Administration Edition can use the EXPLAIN_SQL routine to obtain a query plan in XML format, interpret the XML, and render the plan visually.

If you plan to use Data Studio to obtain Visual Explain output, you must create and specify a default sbspace name for the SBSPACENAME configuration parameter in your onconfig file. The EXPLAIN_SQL routine creates BLOBs in this sbspace.

For information about using Data Studio, see Data Studio documentation.

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