Runstats, typically found in database management systems like IBM Db2, are utility programs used to collect statistics about the data within tables and indexes. These statistics describe characteristics such as data distribution, cardinality, and size. The database optimizer uses these statistics to make informed decisions about the most efficient execution plan for SQL queries. By running runstats, you enable the optimizer to select the best access paths, leading to improved query performance. Without accurate statistics, the optimizer might choose suboptimal plans, resulting in slow query execution.
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