# 7.3.17. `config_set`

## 7.3.17.1. Summary

New in version 5.1.2.

`config_set` command sets a value to the specified configuration item.

## 7.3.17.2. Syntax

This command takes two required parameters:

    config_set key value

## 7.3.17.3. Usage

Here is an example to set a value to `alias.column` configuration item and confirm the set value:

Execution example:

    config_set alias.column Aliases.real_name
    # [[0, 1337566253.89858, 0.000355720520019531], true]
    config_get alias.column
    # [[0, 1337566253.89858, 0.000355720520019531], "Aliases.real_name"]

## 7.3.17.4. Parameters

This section describes all parameters.

### 7.3.17.4.1. Required parameters

There are required parameters.

#### 7.3.17.4.1.1. `key`

Specifies the key of target configuration item.

The max key size is 4KiB.

You can’t use an empty string as key.

#### 7.3.17.4.1.2. `value`

Specifies the value of the target configuration item specified by `key`.

The max value size is 4091B (= 4KiB - 5B).

### 7.3.17.4.2. Optional parameters

There is no optional parameter.

## 7.3.17.5. Return value

`config_set` command returns whether setting a configuration item value is succeeded or not:

    [HEADER, SUCCEEDED_OR_NOT]

### 7.3.17.5.1. `HEADER`

See Output format about `HEADER`.

### 7.3.17.5.2. `SUCCEEDED_OR_NOT`

If command succeeded, it returns true, otherwise it returns false on error.

## 7.3.17.6. See also

> - Configuration

> - config_get

> - config_delete

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7.3.16. `config_get`

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7.3.18. `database_unmap`