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Add index acceleration related sysvars and config parameter. #9657

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Sep 13, 2022
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Add index acceleration related sysvars and config parameter. #9657

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c4c41d8
Add index acceleration related sysvars and config parameter.
Benjamin2037 Jul 20, 2022
dc935f9
Edit doc.
Benjamin2037 Sep 5, 2022
8948382
fix format
Oreoxmt Sep 6, 2022
d5e1115
Merge branch 'master' into add_index_accel_doc_pr
Oreoxmt Sep 6, 2022
2112c09
review: update tidb_ddl_enable_fast_reorg
Oreoxmt Sep 8, 2022
7b54d02
Apply suggestions from code review
Oreoxmt Sep 13, 2022
057b503
Merge branch 'master' into add_index_accel_doc_pr
Oreoxmt Sep 13, 2022
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18 changes: 18 additions & 0 deletions system-variables.md
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Expand Up @@ -814,6 +814,24 @@ Constraint checking is always performed in place for pessimistic transactions (d
- Default value: `0`
- This variable is read-only. It is used to obtain the timestamp of the current transaction.

### tidb_ddl_disk_quota <span class="version-mark">New in v6.3.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
- Type: Integer
- Default value: `107374182400` (100 GiB)
- Range: `[107374182400, 1125899906842624]` ([100 GiB, 1 PiB])
- Unit: Bytes
- This variable only takes effect when [`tidb_ddl_enable_fast_reorg`](#tidb_ddl_enable_fast_reorg-new-in-v630) is enabled. It sets the usage limit of local storage during backfilling when creating an index.

### tidb_ddl_enable_fast_reorg <span class="version-mark">New in v6.3.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
- Type: Boolean
- Default value: `OFF`
- This variable controls whether to enable the acceleration of `ADD INDEX` and `CREATE INDEX` DDl operations to improve the speed of backfilling when creating an index. If this variable is enabled, TiDB uses a more effective way to create an index.

### tidb_ddl_error_count_limit

- Scope: GLOBAL
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6 changes: 6 additions & 0 deletions tidb-configuration-file.md
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Expand Up @@ -700,6 +700,12 @@ Configuration items related to the PROXY protocol.
>
> Use `*` with caution because it might introduce security risks by allowing a client of any IP address to report its IP address. In addition, using `*` might also cause the internal component that directly connects to TiDB (such as TiDB Dashboard) to be unavailable.

### `temp-dir` <span class="version-mark">New in v6.3.0</span>

+ File system location used by TiDB to store temporary data. If a feature requires local storage in TiDB nodes, TiDB stores the corresponding temporary data in this location.
+ When creating an index, if [`tidb_ddl_enable_fast_reorg`](/system-variables.md#tidb_ddl_enable_fast_reorg-new-in-v630) is enabled, data that needs to be backfilled for a newly created index will be at first stored in the TiDB local temporary directory, and then imported into TiKV in batches, thus accelerating the index creation.
+ Default value: `"/tmp/tidb"`

## experimental

The `experimental` section, introduced in v3.1.0, describes the configurations related to the experimental features of TiDB.
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