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ti-chi-bot merged 2 commits into from
Apr 10, 2024
Merged

ebnf show variables (#17000) #17118

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ebnf show variables
dveeden Apr 8, 2024
a88d7f1
Update sql-statements/sql-statement-show-variables.md
dveeden Apr 9, 2024
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41 changes: 30 additions & 11 deletions sql-statements/sql-statement-show-variables.md
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Expand Up @@ -9,17 +9,14 @@ This statement shows a list of variables for the scope of either `GLOBAL` or `SE

## Synopsis

**ShowStmt:**

![ShowStmt](/media/sqlgram/ShowStmt.png)

**ShowTargetFilterable:**

![ShowTargetFilterable](/media/sqlgram/ShowTargetFilterable.png)

**GlobalScope:**

![GlobalScope](/media/sqlgram/GlobalScope.png)
```ebnf+diagram
ShowVariablesStmt ::=
"SHOW" ("GLOBAL" | "SESSION")? VARIABLES ShowLikeOrWhere?

ShowLikeOrWhere ::=
"LIKE" SimpleExpr
| "WHERE" Expression
```

## Examples

Expand Down Expand Up @@ -145,6 +142,28 @@ mysql> SHOW GLOBAL VARIABLES LIKE 'time_zone%';
| time_zone | SYSTEM |
+---------------+--------+
1 row in set (0.00 sec)

mysql> SHOW VARIABLES WHERE Variable_name="tidb_window_concurrency";
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| tidb_window_concurrency | -1 |
+-------------------------+-------+
1 row in set (0.00 sec)

mysql> SHOW VARIABLES WHERE Value=300;
+--------------------------------+-------+
| Variable_name | Value |
+--------------------------------+-------+
| ddl_slow_threshold | 300 |
| delayed_insert_timeout | 300 |
| innodb_purge_batch_size | 300 |
| key_cache_age_threshold | 300 |
| slave_checkpoint_period | 300 |
| tidb_slow_log_threshold | 300 |
| tidb_wait_split_region_timeout | 300 |
+--------------------------------+-------+
7 rows in set (0.00 sec)
```

## MySQL compatibility
Expand Down