Q

query

A request for information from the database based on specific conditions, such as a request for a list of all customers in a customer table whose balance is greater than $1,000.

query optimization class

A set of query rewrite rules and optimization techniques for compiling queries.

query optimizer

A component of the SQL compiler that chooses an access plan for a data manipulation language statement by modeling the execution cost of many alternative access plans and choosing the one with the minimum estimated cost.

quiesce

To end a process by allowing operations to complete normally while rejecting any new requests for work.

quiesce point

A point at which data is consistent as a result of running the DB2 UDB QUIESCE utility.