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planner: update the fix-control doc (#19520) #19675

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Dec 13, 2024
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planner: update the fix-control doc (#19520) #19675

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12 changes: 12 additions & 0 deletions optimizer-fix-controls.md
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Expand Up @@ -71,6 +71,18 @@ SET SESSION tidb_opt_fix_control = '44262:ON,44389:ON';
- This variable sets the threshold for the optimizer's heuristic strategy to select access paths. If the estimated rows for an access path (such as `Index_A`) is much smaller than that of other access paths (default `1000` times), the optimizer skips the cost comparison and directly selects `Index_A`.
- `0` means to disable this heuristic strategy.

### [`45798`](https://github.com/pingcap/tidb/issues/45798) <span class="version-mark">New in v7.5.0</span>

- Default value: `ON`
- Possible values: `ON`, `OFF`
- This variable controls whether Plan Cache is allowed to cache execution plans that access [generated columns](/generated-columns.md).

### [`46177`](https://github.com/pingcap/tidb/issues/46177) <span class="version-mark">New in v6.5.6, v7.1.3 and v7.5.0</span>

- Default value: `ON`
- Possible values: `ON`, `OFF`
- This variable controls whether the optimizer explores enforced plans during query optimization after finding an unenforced plan.

### [`52869`](https://github.com/pingcap/tidb/issues/52869) <span class="version-mark">New in v8.1.0</span>

- Default value: `OFF`
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