MariaDB Max Connections – Helpful Guide

In this MariaDB tutorial, we will discuss MariaDB Max Connections and look at several examples related to it. There are lists of the topic that comes under discussion:

• MariaDB Max Connections
• MariaDB Max Connections Per User
• MariaDB Max Connections Error
• MariaDB Max Connections my.cnf
• MariaDB Max Connections limit
• MariaDB Max_Connections 214
• MariaDB Max Connections 214 centos
• MariaDB Max Connections Change
• MariaDB Max_Connections 151
• MariaDB Max Connections Variable

MariaDB Max Connections

In this section, we will know about the MariaDB Max Connections in detail and which is explained with the help of an example. To change the maximum connection of the instance, we use the max_connection variable in the MariaDB.

MariaDB Max Connections Variable

In MariaDB, the Max Connection by default is configured for connections up to 150. If we use the root connection as the case then the connection will become up to 151. The system variable named max_connection connects the number of connections to be allowed. We know that 100 is the default value for the max_connections.

The setting of maximum connections will not be customer-tunable using the SkySQL Configuration Manager. As a result, SkySQL Power Tier clients may contact us to discuss typical tuning requirements.

When a user wants to raise the number of MariaDB/MySQL connections, numerous factors should be considered, as given below, because the system’s maximum supported number is dependent on them:

• It depends on the RAM quantity available.
• It depends on the response time.
• How much RAM is needed as per connections? (Simple query instructions use less RAM than labor-intensive ones, which require more connections.)

Read: How to load files into MariaDB

MariaDB Max Connections Per User

In this sub-topic, we will know the max connection per user in the MariaDB and which is explained with the help of an example.

In MariaDB, the max connections by default are configured up to 150. In addition, one more connection is operated from root access but it is not used already, then it becomes 151 connections.

The illustrated example to max connection per user in the following query:

EXAMPLE:

SET GLOBAL MAX_CONNECTION=151;

SELECT @@GLOBAL.MAX_CONNECTIONS;

In the preceding query, we have to set the max_connections as 151 in the global variable by using the SET statement. To check the max_connections in the global variable as global.max_connections by using the SELECT statement.

Read: MariaDB Reserved Words

MariaDB Max Connections Error

In this section, we will talk about the error caused by the Max Connections in the MariaDB in detail.

In MariaDB, the maximum allowed number of connections by default is 151. But when the limit is reached which is more than the default value then the error of “too many connections” will be received if anyone tries to connect to the MariaDB server.

So that connection problems can be recognized, MariaDB authorizes one additional connection on the top level of the database’s max connections limit, which is retained at SUPER privilege. In essence, this SUPER permission grants administrator-level user access. As a result, we must avoid app users that have SUPER privilege. 

The quantity of memory used and RAM available for each connection have an impact. However, if an application-side connection pool is used, max connections must be bigger than max connections. When a large number of connections are expected, connection pooling is regarded as a good substitute.

Read: MariaDB Date_Format + Examples

MariaDB Max Connections my.cnf

In this section, we will learn how to set the max connections in the my.cnf file as a configuration setting file in the detail and which is explained with the help of an example.

Here are the steps to follow to change my configuration setting file in the MariaDB:

• To see the max connection file log on to MySQL Client (MariaDB 10.7) with the command prompt (cmd):

mysql -u root -p

• Use this command in the cmd prompt:

SHOW VARIABLES;

Set the global value of the max_connections in the cmd prompt:

SET GLOBAL MAX_CONNECTIONS=[NEW MAX NO.];

• Now, let’s set the global value of the max_connection in the cmd prompt. If we want to check the new global max value of max_connections in the cmd, then use the following STATEMENT in the command:

SET GLOBAL MAX_CONNECTIONS=200;

SELECT @@GLOBAL.MAX_CONNECTIONS;

Now, let’s use another method in the NOTEPAD to change the max_connections value in the MariaDB software. Follow these steps carefully:

• Open my.cnf file by notepad from the MariaDB folder.

• Directly beneath the first line:

[mysqld]

• Add a line:

max_connections=[desired new max no]

For example, to set the max_connections to 200, the first two lines to read:

[mysqld]
max_connections=200

• Save and exit the file.

Read: MariaDB Rename Table

MariaDB Max Connections limit

In this section, we will understand the limits of the Max_Connections in the MariaDB in detail.

By default, the MariaDB is configured with up to 150 connections and one for root access if not used then it will become 151 connections. The scope should be GLOBAL to change the value of max_connection by the SET statement and in the command line it is used as --max_connection=#.

The limit range of max_connection variable starts from 10 to 100000 from (>= MariaDB 10.3.6, MariaDB 10.2.15, MariaDB 10.1.33) and from 1 to 100000 ( (<= MariaDB 10.3.5, MariaDB 10.2.14, MariaDB 10.1.32).

Read: MariaDB Logs – Helpful Guide

MariaDB Max_Connections 214

In this section, we will learn how to set the max_connection value as 214 and which is explained with the help of an example.

• Run the below following statement in the programming:

SET GLOBAL MAX_CONNECTIONS=214;

SELECT @@GLOBAL.MAX_CONNECTIONS;

In the preceding first query, we have set the global value of max_connections as 214 by using the SET GLOBAL statement. If we want to check the new global max value of the max_connections, then use the SELECT statement.

Read: MariaDB JSON Function + Examples

MariaDB Max Connections 214 centos

In this sub-topic, we will learn how to set the max_connnection as 214 in the Linux CentOS with details.

Here are the steps to be followed in the Linux Centos:

• First, write the following command in the shell. It will open the VIM editor in the Linux CentOS.

vim /etc/my.cnf

• Add the following text in the file to change the new max value of max_connections:

[mysqld]

max_connections=450

show variables like '%max_connections%';

• Then we will save and quit the VIM editor by the following query:
  • First press the ESC button on the keyboard.

:wq

It will first save the new value of the max_connection as 450 then quit it. Once the value of max_connections has been changed. It can be shown by using the SHOW VARIABLES statement.

Read: MariaDB vs Postgres

MariaDB Max Connections Change

In this sub-topic, we will understand how to change the max_connection value in the MariaDB in detail and which is explained with the help of an example.

In all previous sub-topic of the max_connection in MariaDB, we are changing the value as per the user required. Let’s see the example to change the value of max_connections by the following query:

EXAMPLE:

SET GLOBAL MAX_CONNECTIONS=300;

SELECT @@GLOBAL.MAX_CONNECTIONS;

Suppose in the preceding query, the user has to make a connection around 300 in the database. For that, the user uses the SET GLOBAL statement to change the max_connection value to 300.

If we want to check whether the value of max_connection has been changed or not in the MariaDB, then we will use the SELECT statement to retrieve the output of max_connection.

Read: MariaDB Drop Table + Examples

MariaDB Max_Connections 151

In this section, we will learn how to set the max_connection value as 151 by using the SET GLOBAL statement and which is explained with the help of an example.

• Follow the below statement in the procedure:

SET GLOBAL MAX_CONNECTIONS=151;

SELECT @@GLOBAL.MAX_CONNECTIONS;

In the preceding first query, we have set the global value of max_connections as 151 by using the SET GLOBAL statement. If we want to check the new global max value of the max_connections, then use the SELECT statement.

Also, take a look at some more MariaDB tutorials.

• MariaDB Rename Column + Examples
• MariaDB Foreign Key + Examples
• MariaDB Left Join – Helpful Guide
• MariaDB Reset Root Password
• MariaDB Delete From Statement

So, in this MariaDB tutorial, we have discussed about MariaDB Max Connections and also look at some examples. There are lists of the topic that comes under discussion:

• MariaDB Max Connections
• MariaDB Max Connections Per User
• MariaDB Max Connections Error
• MariaDB Max Connections my.cnf
• MariaDB Max Connections limit
• MariaDB Max_Connections 214
• MariaDB Max Connections 214 centos
• MariaDB Max Connection Change
• MariaDB Max_Connection 151
• MariaDB Max Connection Variable