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- MySQL - Where Clause
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MySQL - SHOW VARIABLES Statement
MySQL SHOW VARIABLES Statement
The SHOW VARIABLES Statement is used to display names and values of MySQL system variables.
Syntax
Following is the syntax of the SHOW VARIABLES Statement −
SHOW [GLOBAL | SESSION] VARIABLES [LIKE 'pattern' | WHERE expr]
Example
You can retrieve the list GLOBAL VARIABLES in MySQL using the GLOBAL clause as shown below −
SHOW GLOBAL VARIABLES\G;
Output
The above query produces the following output −
************* 1. row ************* Variable_name: activate_all_roles_on_login Value: OFF ************* 2. row ************* Variable_name: admin_address Value: ************* 3. row ************* Variable_name: admin_port Value: 33062 ************* 4. row ************* Variable_name: admin_ssl_ca Value: ************* 5. row ************* Variable_name: admin_ssl_capath Value: ************* 6. row ************* Variable_name: admin_ssl_cert Value: ************* 7. row ************* Variable_name: admin_ssl_cipher Value: ************* 8. row ************* Variable_name: admin_ssl_crl Value: ************* 9. row ************* Variable_name: admin_ssl_crlpath Value: ************* 10. row ************* Variable_name: admin_ssl_key Value: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Example
You can retrieve the list SESSION VARIABLES in MySQL using the SESSION class as shown below −
SHOW SESSION VARIABLES\G;
Output
Following is the output of the above query −
************* 1. row ************* Variable_name: admin_tls_version Value: TLSv1,TLSv1.1,TLSv1.2,TLSv1.3 ************* 2. row ************* Variable_name: auto_generate_certs Value: ON ************* 3. row ************* Variable_name: auto_increment_increment Value: 1 ************* 4. row ************* Variable_name: auto_increment_offset Value: 1 ************* 5. row ************* Variable_name: autocommit Value: ON ************* 6. row ************* Variable_name: automatic_sp_privileges Value: ON ************* 7. row ************* Variable_name: avoid_temporal_upgrade Value: OFF ************* 8. row ************* Variable_name: back_log Value: 80
The LIKE clause
Using the LIKE clause, you can specify a pattern to retrieve specific variables.
Example
Let us verify whether loading local data is enabled, if not you can observe the local_infile variable value as −
SHOW GLOBAL VARIABLES LIKE 'local_infile';
Output
After executing the above, it will produce the following output −
Variable_name | Value |
---|---|
local_infile | OFF |
Following query enables local_infile option as −
SET GLOBAL local_infile = 'ON';
If you verify the value of the variable local_infile again, you can observe the changed value as −
SHOW GLOBAL VARIABLES LIKE 'local_infile';
Output
Once the query is executed, it will generate following output −
Variable_name | Value |
---|---|
local_infile | ON |
The WHERE clause
You can use the WHERE clause of the SHOW VARIABLES statements to retrieve names of the variables which match the specified condition.
SHOW VARIABLES WHERE Variable_name= 'autocommit';
Output
Following is the output of the above mysql query −
Variable_name | Value |
---|---|
autocommit | ON |