# Displaying TiDB System Variables

__*zz-BGL*__
__*zz-Jeff*__

+ **Example 1:** Display variable at global scope
+ **Example 2:** Display variable at session scope
+ **Example 3:** Display multiple variables

```
~!@// Example 1@!~
SELECT @@global.tidb_distsql_scan_concurrency;

~!@// Example 2@!~
SELECT @@tidb_distsql_scan_concurrency;
SELECT @@session.tidb_distsql_scan_concurrency;

~!@// Example 3@!~
SHOW GLOBAL VARIABLES\G
SHOW GLOBAL VARIABLES like 'tidb_distsql%';
SHOW VARIABLES\G
SHOW VARIABLES like 'tidb_distsql%';
```

-------------------------------------------------------------
To display a variable at `global` scope:

```
SELECT @@global.tidb_distsql_scan_concurrency;
```

Equivalent statements to display a variable at `session` scope:

```
SELECT @@tidb_distsql_scan_concurrency;
SELECT @@session.tidb_distsql_scan_concurrency;
```

Please refer to `https://docs.pingcap.com/tidb/stable/system-variables` for detail.