| 摘要 |
Database systems use a plan cache to avoid the overheads (e.g., time, money) of query recompilation. Query plans can become invalidated by updates to the statistics on data or changes to the physical database design. Once a plan is invalidated, it can be repaired utilizing one or more of the disclosed embodiments. Incremental repair of query plans includes reusing parts of the current plan rather than discarding the plan entirely when it is invalidated. Repair to an existing query plan is attempted before resorting to full recompilation.
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