首页>
外国专利>
Execution of query plans for database query within environments of databases
Execution of query plans for database query within environments of databases
展开▼
机译:在数据库环境中执行数据库查询的查询计划
展开▼
页面导航
摘要
著录项
相似文献
摘要
A database query is submitted to a first query optimizer to receive a first query plan from the first query optimizer. The first query plan is set as a current query plan. As an entry point, the current query plan is executed against the database within a given environment of the database. Where execution of the current query plan within the given environment is problematic, the execution of the current query plan is prematurely terminated, and the database query is submitted to a second query optimizer. Where a second query plan that is different than any previous query plan for the database query has been received from the second query optimizer, the second query plan is set as the current query plan, and a risk to the database in executing the current query plan is determined. Where the risk is less than a threshold, the entry point is proceeded to.
展开▼