Answer / Prince Bhatia

Optimizer Directives are special SQL statements used to guide Informix's query optimizer in choosing the best execution plan for a given query. They can be used to override default optimization decisions or force specific operators to be used. For example, the 'FORCE INDEX' directive enforces the use of a specific index to improve performance, while the 'WITH (NO PUSHDOWN)' directive prevents certain operations from being pushed down to the storage engine for better control over resource utilization.

explain the concept of fragment elimination in informix ?

1 Answers   IBM,

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what are the options/commands used which dbspace a database resides?

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what is an extent in informix?

1 Answers   IBM,

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explain the purpose of optimizer directives and how/why you would use them

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