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sql: fix the scope of some tidb variables #476

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May 25, 2018
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sql: fix the scope of some tidb variables #476

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8 changes: 4 additions & 4 deletions sql/tidb-specific.md
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Expand Up @@ -24,7 +24,7 @@ If you need to set the global variable, run:

### tidb_import_data

- Scope: SESSION | GLOBAl
- Scope: SESSION
- Default value: 0
- This variable indicates whether to import data from the dump file currently.
- To speed up importing, the unique index constraint is not checked when the variable is set to 1.
Expand Down Expand Up @@ -126,21 +126,21 @@ If you need to set the global variable, run:

### tidb_batch_insert

- Scope: SESSION | GLOBAL
- Scope: SESSION
- Default value: 0
- This variable is used to set whether to divide the inserted data automatically. It is valid only when `autocommit` is enabled.
- When inserting a large amount of data, you can set the variable value to true. Then the inserted data is automatically divided into multiple batches and each batch is inserted by a single transaction.

### tidb_batch_delete

- Scope: SESSION | GLOBAL
- Scope: SESSION
- Default value: 0
- This variable is used to set whether to divide the data for deletion automatically. It is valid only when `autocommit` is enabled.
- When deleting a large amount of data, you can set the variable value to true. Then the data for deletion is automatically divided into multiple batches and each batch is deleted by a single transaction.

### tidb_dml_batch_size

- Scope: SESSION | GLOBAL
- Scope: SESSION
- Default value: 20000
- This variable is used to set the automatically divided batch size of the data for insertion/deletion. It is only valid when `tidb_batch_insert` or `tidb_batch_delete` is enabled.
- When the data size of a single row is very large, the overall data size of 20 thousand rows exceeds the size limit for a single transaction. In this case, set the variable to a smaller value.
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