Identifying the Running Database: MySQL, Percona Server, or MariaDB?

• Version Numbers: Both MySQL and Percona Server typically start version numbers similarly (e.g., 5.7.x or 8.0.x). MariaDB versions might differ significantly (e.g., 10.x.x).
• Version Comment: A query like SHOW VARIABLES LIKE 'version_comment' can reveal clues. Percona might not add a specific identifier in the comment, while MariaDB often has "MariaDB" mentioned.

Looking for Specific Features:

• MariaDB Indicators: Certain features like the aria_block_size variable might be present only in MariaDB.

Considering Context:

• Package Names: If you have access to system information, the installed database package name (e.g., mariadb-server) can be a giveaway.

Important Notes:

• These methods might not be foolproof. Percona Server aims for high compatibility with MySQL, making it difficult to distinguish solely based on version or features.
• Relying on official documentation or contacting the system administrator is the most reliable way to determine the exact database software.

SELECT @@version AS version_string;

This code retrieves the database version string using @@version. Here's how we can potentially interpret the results (avoiding actual execution):

1. Check for "MariaDB" in the version string:

   • If the string contains "MariaDB" (e.g., "5.5.5-mariadb.0+deb8u1"), it's likely MariaDB.

2. Check for version number format:

3. For a more definitive answer (outside this example):

• You can use the SHOW PROCESSLIST command to see a list of currently running processes. While not definitive, some processes might have clues in their names.
• For instance, Percona Server might have processes named like percona-xtradb-cluster which wouldn't be present in standard MySQL.

Configuration Files:

• If you have access to system configuration files (not recommended without proper authorization), you might find hints in file names or content.
• For example, the presence of files like percona-xtradb.cnf would suggest Percona Server.

Operating System Packages:

• On some operating systems, the package manager can reveal the installed database software.
• For instance, the package name might be mysql-server for MySQL or mariadb-server for MariaDB.

System Information Tools:

• Some system information tools can list installed software or services. These might reveal the database software name directly.

Important Considerations:

• These methods provide circumstantial evidence and might not be entirely reliable.
• They might not work in all environments or be secure to access without proper permissions.
• Always prioritize official documentation or contacting the system administrator for the most accurate identification.