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docs/op-guide: create GC document #433

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Apr 24, 2018
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docs/op-guide: create GC document
CaitinChen Apr 20, 2018
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Update gc.md
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CaitinChen Apr 23, 2018
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CaitinChen Apr 23, 2018
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CaitinChen Apr 24, 2018
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Update gc.md
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@CaitinChen
CaitinChen authored Apr 24, 2018
commit d1ec16a5c7ee65dd26211981b28e12661f8467ae
4 changes: 2 additions & 2 deletions op-guide/gc.md
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Expand Up @@ -15,7 +15,7 @@ GC runs periodically on TiDB. When a TiDB server is started, a `gc_worker` is en

## Configuration and monitor

The GC configuration and operational status are recorded in the `mysql.tidb` system table, which can be monitored and configured using the following SQL statement:
The GC configuration and operational status are recorded in the `mysql.tidb` system table as below, which can be monitored and configured using SQL statements:

```sql
mysql> select VARIABLE_NAME, VARIABLE_VALUE from mysql.tidb;
Expand All @@ -36,7 +36,7 @@ mysql> select VARIABLE_NAME, VARIABLE_VALUE from mysql.tidb;
10 rows in set (0.02 sec)
```

In the table above, `tikv_gc_run_interval`, `tikv_gc_life_time` and `tikv_gc_concurrency` can be configured manually. Other variables with the `tikv_gc prefix` prefix record the current status, which are automatically updated by TiDB. Do not modify these variables.
In the table above, `tikv_gc_run_interval`, `tikv_gc_life_time` and `tikv_gc_concurrency` can be configured manually. Other variables with the `tikv_gc` prefix record the current status, which are automatically updated by TiDB. Do not modify these variables.

- `tikv_gc_leader_uuid`, `tikv_gc_leader_desc`, `tikv_gc_leader_lease`: the current GC leader information.

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