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information_schema: Add links (#17327) #17330

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information_schema: Add links
Oreoxmt May 14, 2024
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Oreoxmt May 14, 2024
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11 changes: 6 additions & 5 deletions information-schema/information-schema-analyze-status.md
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Expand Up @@ -11,8 +11,6 @@ summary: 了解 information_schema 表 `ANALYZE_STATUS`。

从 TiDB v6.1.0 起，可以通过系统表 `mysql.analyze_jobs` 查看过去 7 天内的历史任务记录。

{{< copyable "sql" >}}

```sql
USE information_schema;
DESC analyze_status;
Expand Down Expand Up @@ -40,8 +38,6 @@ DESC analyze_status;
14 rows in set (0.00 sec)
```

{{< copyable "sql" >}}

```sql
SELECT * FROM information_schema.analyze_status;
```
Expand Down Expand Up @@ -76,4 +72,9 @@ SELECT * FROM information_schema.analyze_status;
* `PROCESS_ID`：执行任务的 process ID。
* `REMAINING_SECONDS`：执行任务预计还需要多少秒才能完成。
* `PROGRESS`：执行任务的进度。
* `ESTIMATED_TOTAL_ROWS`：执行任务需要分析的总行数。
* `ESTIMATED_TOTAL_ROWS`：执行任务需要分析的总行数。

## 另请参阅

- [`ANALYZE TABLE`](/sql-statements/sql-statement-analyze-table.md)
- [`SHOW ANALYZE STATUS`](/sql-statements/sql-statement-show-analyze-status.md)
7 changes: 7 additions & 0 deletions information-schema/information-schema-character-sets.md
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Expand Up @@ -54,3 +54,10 @@ SELECT * FROM `CHARACTER_SETS`;
* `DEFAULT_COLLATE_NAME`：字符集的默认排序规则名称
* `DESCRIPTION`：字符集的描述信息
* `MAXLEN`：该字符集存储一个字符所需要的最大字节数

## 另请参阅

- [`SHOW CHARACTER SET`](/sql-statements/sql-statement-show-character-set.md)
- [`SHOW COLLATION`](/sql-statements/sql-statement-show-collation.md)
- [`INFORMATION_SCHEMA.COLLATIONS`](/information-schema/information-schema-collations.md)
- [`INFORMATION_SCHEMA.COLLATION_CHARACTER_SET_APPLICABILITY`](/information-schema/information-schema-collation-character-set-applicability.md)
7 changes: 7 additions & 0 deletions information-schema/information-schema-collation-character-set-applicability.md
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Expand Up @@ -47,3 +47,10 @@ SELECT * FROM COLLATION_CHARACTER_SET_APPLICABILITY WHERE character_set_name='ut

* `COLLATION_NAME`：排序规则名称
* `CHARACTER_SET_NAME`：排序规则所属的字符集名称

## 另请参阅

- [`SHOW CHARACTER SET`](/sql-statements/sql-statement-show-character-set.md)
- [`SHOW COLLATION`](/sql-statements/sql-statement-show-collation.md)
- [`INFORMATION_SCHEMA.CHARACTER_SETS`](/information-schema/information-schema-character-sets.md)
- [`INFORMATION_SCHEMA.COLLATIONS`](/information-schema/information-schema-collations.md)
7 changes: 7 additions & 0 deletions information-schema/information-schema-collations.md
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Expand Up @@ -53,3 +53,10 @@ SELECT * FROM collations WHERE character_set_name='utf8mb4';
* `IS_DEFAULT`：该排序规则是否是所属字符集的默认排序规则
* `IS_COMPILED`：字符集是否编译到服务器中
* `SORTLEN`：排序规则在对字符进行排序时，所分配内存的最小长度

## 另请参阅

- [`SHOW CHARACTER SET`](/sql-statements/sql-statement-show-character-set.md)
- [`SHOW COLLATION`](/sql-statements/sql-statement-show-collation.md)
- [`INFORMATION_SCHEMA.CHARACTER_SETS`](/information-schema/information-schema-character-sets.md)
- [`INFORMATION_SCHEMA.COLLATION_CHARACTER_SET_APPLICABILITY`](/information-schema/information-schema-collation-character-set-applicability.md)
4 changes: 4 additions & 0 deletions information-schema/information-schema-columns.md
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Expand Up @@ -122,3 +122,7 @@ SHOW COLUMNS FROM t1 FROM test;
+-------+---------+------+------+---------+-------+
1 row in set (0.00 sec)
```

## 另请参阅

- [`SHOW COLUMNS FROM`](/sql-statements/sql-statement-show-columns-from.md)
8 changes: 4 additions & 4 deletions information-schema/information-schema-engines.md
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Expand Up @@ -7,8 +7,6 @@ summary: 了解 information_schema 表 `ENGINES`。

`ENGINES` 表提供了关于存储引擎的信息。从和 MySQL 兼容性上考虑，TiDB 会一直将 InnoDB 描述为唯一支持的引擎。此外，`ENGINES` 表中其它列值也都是定值。

{{< copyable "sql" >}}

```sql
USE information_schema;
DESC engines;
Expand All @@ -28,8 +26,6 @@ DESC engines;
6 rows in set (0.00 sec)
```

{{< copyable "sql" >}}

```sql
SELECT * FROM engines;
```
Expand All @@ -51,3 +47,7 @@ SELECT * FROM engines;
* `TRANSACTIONS`：存储引擎是否支持事务。
* `XA`：存储引擎是否支持 XA 事务。
* `SAVEPOINTS`：存储引擎是否支持 `savepoints`。

## 另请参阅

- [`SHOW ENGINES`](/sql-statements/sql-statement-show-engines.md)
5 changes: 5 additions & 0 deletions information-schema/information-schema-memory-usage.md
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Expand Up @@ -59,3 +59,8 @@ SELECT * FROM information_schema.memory_usage;
* GC_TOTAL：从 TiDB 启动到当前累计由内存使用触发 Golang GC 的次数。
* DISK_USAGE：当前数据落盘的硬盘使用量，单位为 byte。
* QUERY_FORCE_DISK：从 TiDB 启动到当前累计的落盘次数。

## 另请参阅

- [TiDB 内存控制](/configure-memory-usage.md)
- [TiKV 内存参数性能调优](/tune-tikv-memory-performance.md)
6 changes: 5 additions & 1 deletion information-schema/information-schema-partitions.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 INFORMATION_SCHEMA 表 `PARTITIONS`。

# PARTITIONS

`PARTITIONS` 表提供有关分区表的信息。
`PARTITIONS` 表提供有关[分区表](/partitioned-table.md)的信息。

```sql
USE INFORMATION_SCHEMA;
Expand Down Expand Up @@ -115,3 +115,7 @@ SUBPARTITION_ORDINAL_POSITION: NULL
TIDB_PLACEMENT_POLICY_NAME: NULL
2 rows in set (0.00 sec)
```

## 另请参阅

- [用 EXPLAIN 查看分区查询的执行计划](/explain-partitions.md)
8 changes: 2 additions & 6 deletions information-schema/information-schema-processlist.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 information_schema 表 `PROCESSLIST`。

# PROCESSLIST

`PROCESSLIST` 和 `SHOW PROCESSLIST` 的功能一样，都是查看当前正在处理的请求。
`PROCESSLIST` 和 [`SHOW PROCESSLIST`](/sql-statements/sql-statement-show-processlist.md) 的功能一样，都是查看当前正在处理的请求。

`PROCESSLIST` 表比 `SHOW PROCESSLIST` 的结果多出下面几列：

Expand All @@ -15,8 +15,6 @@ summary: 了解 information_schema 表 `PROCESSLIST`。
* `TxnStart`列：显示事务的开始时间。
* `RESOURCE_GROUP`列：显示对应的资源组名称。

{{< copyable "sql" >}}

```sql
USE information_schema;
DESC processlist;
Expand All @@ -43,8 +41,6 @@ DESC processlist;
13 rows in set (0.00 sec)
```

{{< copyable "sql" >}}

```sql
SELECT * FROM processlist\G
```
Expand Down Expand Up @@ -90,7 +86,7 @@ SELECT * FROM processlist\G
{{< copyable "sql" >}}

```sql
SELECT * FROM cluster_processlist;
SELECT * FROM information_schema.cluster_processlist;
```

```sql
Expand Down
2 changes: 1 addition & 1 deletion information-schema/information-schema-referential-constraints.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 INFORMATION_SCHEMA 表 `REFERENTIAL_CONSTRAINTS`。

# REFERENTIAL_CONSTRAINTS

`REFERENTIAL_CONSTRAINTS` 表提供 TiDB 表之间 `FOREIGN KEY` 关系的信息。
`REFERENTIAL_CONSTRAINTS` 表提供 TiDB 表之间 [`FOREIGN KEY`](/foreign-key.md) 关系的信息。

```sql
USE INFORMATION_SCHEMA;
Expand Down
6 changes: 1 addition & 5 deletions information-schema/information-schema-schemata.md
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Expand Up @@ -5,9 +5,7 @@ summary: 了解 information_schema 表 `SCHEMATA`。

# SCHEMATA

`SCHEMATA` 表提供了关于数据库的信息。表中的数据与 `SHOW DATABASES` 语句的执行结果等价。

{{< copyable "sql" >}}
`SCHEMATA` 表提供了关于数据库的信息。表中的数据与 [`SHOW DATABASES`](/sql-statements/sql-statement-show-databases.md) 语句的执行结果等价。

```sql
USE information_schema;
Expand All @@ -27,8 +25,6 @@ desc SCHEMATA;
5 rows in set (0.00 sec)
```

{{< copyable "sql" >}}

```sql
SELECT * FROM SCHEMATA;
```
Expand Down
8 changes: 8 additions & 0 deletions information-schema/information-schema-sequences.md
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Expand Up @@ -74,3 +74,11 @@ SEQUENCE_SCHEMA: test
COMMENT:
1 row in set (0.00 sec)
```

## 另请参阅

- [`CREATE SEQUENCE`](/sql-statements/sql-statement-create-sequence.md)
- [`SHOW CREATE SEQUENCE`](/sql-statements/sql-statement-show-create-sequence.md)
- [`ALTER SEQUENCE`](/sql-statements/sql-statement-alter-sequence.md)
- [`DROP SEQUENCE`](/sql-statements/sql-statement-drop-sequence.md)
- [序列函数](/functions-and-operators/sequence-functions.md)
2 changes: 1 addition & 1 deletion information-schema/information-schema-session-variables.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 INFORMATION_SCHEMA 表 `SESSION_VARIABLES`。

# SESSION_VARIABLES

`SESSION_VARIABLES` 表提供了关于 session 变量的信息。表中的数据跟 `SHOW SESSION VARIABLES` 语句执行结果类似。
`SESSION_VARIABLES` 表提供了关于 session 变量的信息。表中的数据跟 [`SHOW SESSION VARIABLES`](/sql-statements/sql-statement-show-variables.md) 语句执行结果类似。

```sql
USE INFORMATION_SCHEMA;
Expand Down
2 changes: 1 addition & 1 deletion information-schema/information-schema-slow-query.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 INFORMATION_SCHEMA 表 `SLOW_QUERY`。

# SLOW_QUERY

`SLOW_QUERY` 表中提供了当前节点的慢查询相关的信息，其内容通过解析当前节点的 TiDB 慢查询日志而来，列名和慢日志中的字段名是一一对应。关于如何使用该表调查和改善慢查询，请参考[慢查询日志文档](/identify-slow-queries.md)。
`SLOW_QUERY` 表中提供了当前节点的慢查询相关的信息，其内容通过解析当前节点的 TiDB [慢查询日志](/tidb-configuration-file.md#slow-query-file)而来，列名和慢日志中的字段名是一一对应。关于如何使用该表调查和改善慢查询，请参考[慢查询日志文档](/identify-slow-queries.md)。

```sql
USE INFORMATION_SCHEMA;
Expand Down
2 changes: 1 addition & 1 deletion information-schema/information-schema-table-constraints.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 information_schema 表 `TABLE_CONSTRAINTS`。

# TABLE_CONSTRAINTS

`TABLE_CONSTRAINTS` 表记录了表的约束信息。
`TABLE_CONSTRAINTS` 表记录了表的[约束](/constraints.md)信息。

{{< copyable "sql" >}}

Expand Down
4 changes: 4 additions & 0 deletions information-schema/information-schema-user-privileges.md
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Expand Up @@ -79,3 +79,7 @@ SELECT * FROM USER_PRIVILEGES;
* `TABLE_CATALOG`：表所属的目录的名称。该值始终为 `def`。
* `PRIVILEGE_TYPE`：被授权的权限类型，每行只列一个权限。
* `IS_GRANTABLE`：如果用户有 `GRANT OPTION` 的权限，则为 `YES`，否则为 `NO`。

## 另请参阅

- [`SHOW GRANTS`](/sql-statements/sql-statement-show-grants.md)
2 changes: 1 addition & 1 deletion information-schema/information-schema-variables-info.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 information_schema 表 `VARIABLES_INFO`。

# VARIABLES_INFO

`VARIABLES_INFO` 可用于查看当前 TiDB 集群或实例的系统变量默认值、当前值以及作用域等信息。
`VARIABLES_INFO` 可用于查看当前 TiDB 集群或实例的[系统变量](/system-variables.md)默认值、当前值以及作用域等信息。

```sql
USE information_schema;
Expand Down
7 changes: 6 additions & 1 deletion information-schema/information-schema-views.md
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Expand Up @@ -5,7 +5,7 @@ summary: 了解 INFORMATION_SCHEMA 表 `VIEWS`。

# VIEWS

`VIEWS` 表提供了关于 SQL 视图的信息。
`VIEWS` 表提供了关于 [SQL 视图](/views.md)的信息。

```sql
USE INFORMATION_SCHEMA;
Expand Down Expand Up @@ -68,3 +68,8 @@ COLLATION_CONNECTION: utf8mb4_0900_ai_ci
* `SECURITY_TYPE`：`SQL SECURITY` 的值，取值为 `DEFINER` 或 `INVOKER`。
* `CHARACTER_SET_CLIENT`：在视图创建时 session 变量 `character_set_client` 的值。
* `COLLATION_CONNECTION`：在视图创建时 session 变量 `collation_connection` 的值。

## 另请参阅

- [`CREATE VIEW`](/sql-statements/sql-statement-create-view.md)
- [`DROP VIEW`](/sql-statements/sql-statement-drop-view.md)
2 changes: 1 addition & 1 deletion information-schema/information-schema.md
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Expand Up @@ -6,7 +6,7 @@ title: Information Schema

Information Schema 提供了一种查看系统元数据的 ANSI 标准方法。除了包含与 MySQL 兼容的表外，TiDB 还提供了许多自定义的 `INFORMATION_SCHEMA` 表。

许多 `INFORMATION_SCHEMA` 表都有相应的 `SHOW` 命令。查询 `INFORMATION_SCHEMA` 的好处是可以在表之间进行 `join` 操作。
许多 `INFORMATION_SCHEMA` 表都可以通过相应的 `SHOW` 语句查看。查询 `INFORMATION_SCHEMA` 的好处是可以在表之间进行 `join` 操作。

## 与 MySQL 兼容的表

Expand Down
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