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docs: improve the system table chapter

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Xiaoyu Wang 2022-09-28 15:28:39 +08:00
parent 7ebbce4542
commit c240e33067
1 changed files with 4 additions and 4 deletions
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8
docs/en/12-taos-sql/22-meta.md
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@ -14,7 +14,7 @@ TDengine includes a built-in database named `INFORMATION_SCHEMA` to provide acce
:::info
- SHOW statements are still supported for the convenience of existing users.
- Some columns in the system table may be keywords, and you need to use the escape character '\`' when querying, for example, the query database test has several VGROUPs:
- Some columns in the system table may be keywords, and you need to use the escape character '\`' when querying, for example, to query the VGROUPS in the database `test`:
```sql
select `vgroups` from ins_databases where name = 'test';
```
@ -111,9 +111,9 @@ Provides information about user-created databases. Similar to SHOW DATABASES.
| 25 | wal_retention_size | INT | Maximum WAL size |
| 26 | wal_roll_period | INT | WAL rotation period |
| 27 | wal_segment_size | BIGINT | WAL file size |
| 28 | stt_trigger | SMALLINT | The number of files placed on the disk that trigger file merging |
| 29 | table_prefix | SMALLINT | The table name is used for the prefix length that needs to be ignored when calculating the consistent HASH |
| 30 | table_suffix | SMALLINT | The table name is used for the suffix length that needs to be ignored when calculating the consistent HASH |
| 28 | stt_trigger | SMALLINT | The threshold for number of files to trigger file merging |
| 29 | table_prefix | SMALLINT | The prefix length in the table name that is ignored when distributing table to vnode based on table name |
| 30 | table_suffix | SMALLINT | The suffix length in the table name that is ignored when distributing table to vnode based on table name |
| 31 | tsdb_pagesize | INT | Page size for vnode data storage engine, in KB |
## INS_FUNCTIONS