SHOW VARIABLES

Description

This statement is used to display Doris system variables, which can be queried by conditions

Syntax

SHOW [<effective_scope>] VARIABLES [<like_pattern> | <where>]

Optional Parameters

1. <effective_scope>

Effective scope is one of GLOBAL or SESSION or LOCAL. If there is no effective scope, default value is SESSION. LOCAL is an alias of SESSION.

2. <like_pattern>

Use like statement to match and filter result

3. <where>

Use where statement to match and filter result

Access Control Requirements

Users executing this SQL command must have at least the following privileges:

Privilege	Object	Notes
Any_PRIV	Session	Any privilege can show variables

Return Value

Variable_name	Value	Default_Value	Changed
variable name1	value1	default value1	0/1
variable name2	value2	default value2	0/1

Usage Notes

• Show variables is mainly used to view the values of system variables.
• Executing the SHOW VARIABLES command does not require any privileges, it only requires being able to connect to the server.
• The column Changed from Return Value, 0 means no changed and 1 means changed.
• There are some restrictions when using the SHOW statement:
  • Can not use or in where clause
  • Column names are on the left
  • Only supports equivalent comparisons in where clause
  • Use the like statement to match with variable_name.
  • The % percent wildcard can be used anywhere in the matching pattern

Example

• The default here is to match the Variable_name, here is the exact match

  show variables like 'max_connections';

• Matching through the percent sign (%) wildcard can match multiple items

  show variables like '%connec%';

• Use the Where clause for matching queries

  show variables where variable_name = 'version';