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planner: update the fix-control doc #19520

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merged 5 commits into from
Dec 13, 2024
Merged

planner: update the fix-control doc #19520

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fixup
qw4990 Nov 28, 2024
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qw4990 Nov 29, 2024
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Update optimizer-fix-controls.md
qw4990 Dec 13, 2024
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qw4990 Dec 13, 2024
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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 to allow the Plan Cache to cache plans accessing generated columns.
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### [`46177`](https://github.com/pingcap/tidb/issues/46177) <span class="version-mark">New in v7.5.0</span>
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- Default value: `ON`
- Possible values: `ON`, `OFF`
- This variable controls whether to explore enforced plans during optimization if it has already found an unenforced plan.
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### [`47400`](https://github.com/pingcap/tidb/issues/47400) <span class="version-mark">New in v8.4.0</span>

- Default value: `ON`
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