# Query Plans and Optimizer Trace

- [Execution Plan (CSEP)](https://mariadb.com/docs/analytics/mariadb-columnstore/high-availability/columnstore-query-tuning/query-plans-and-optimizer-trace/columnstore-execution-plan-csep-for-mariadb-enterprise-columnstore.md): The ColumnStore Execution Plan (CSEP) is the internal query-plan representation in MariaDB ColumnStore, generated from SELECT\_LEX and viewable through calSetTrace.
- [Job Steps](https://mariadb.com/docs/analytics/mariadb-columnstore/high-availability/columnstore-query-tuning/query-plans-and-optimizer-trace/job-steps-for-mariadb-enterprise-columnstore.md): Job steps in MariaDB ColumnStore: ExeMgr translates the CSEP into a job list of distributed and multi-threaded steps (BPS, CES, etc.) for parallel query execution across nodes.


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