Methods to check database deadlocks using Navicat include: 1. View active processes through "Server Monitoring" and identify threads waiting for resources; 2. Execute the SHOW ENGINE INNODB STATUS\G command to query the InnoDB deadlock log; 3. Query the INNODB_LOCKS and INNODB_LOCK_WAITS tables to analyze the lock situation; 4. Set up timing tasks or integrate monitoring tools to achieve automatic warning. These methods can effectively help users locate and solve deadlock problems in high concurrency environments and improve system stability.

Checking database deadlocks is an important part of maintaining system stability, especially in high concurrency environments. As a powerful database management tool, Navicat does not directly provide a button to "detect deadlocks with one click", but it can view relevant information and execute queries to help you discover and analyze deadlock problems.

View running processes

In Navicat, you can view the running processes in the current database through Server Monitoring or Query Tools. This is the first step to initially determine whether there is a blockage or deadlock.

• Open Navicat and connect to your database.
• Go to the Tools menu and select "Server Monitoring" (or a function with a similar name, depending on the version).
• In the Processes tab, you can see all currently active connections and actions being performed.

Focus on the "Status" column. If you see multiple threads waiting for resource release and rely on each other's locks, it may be a deadlock.

Query deadlock logs (for MySQL)

If you are using a MySQL database, you can get detailed information by querying the InnoDB deadlock log. Navicat provides a convenient query interface that can quickly execute the following commands:

Open a new query window and enter:

 SHOW ENGINE INNODB STATUS\G

Then execute, focusing on the LATEST DETECTED DEADLOCK section in the output. This section shows the transactions involved in the last deadlock, the SQL statements, and the resources they are waiting for.

Note: This information only retains the last deadlock record, so once an exception is found, you must check and save it in time.

Analyze table locks and row locks

In addition to viewing the log, you can also use some system tables to understand the current lock situation. For example, in MySQL, you can query INNODB_LOCKS and INNODB_LOCK_WAITS tables in information_schema (which may vary depending on the MySQL version).

Example query:

 SELECT * FROM information_schema.INNODB_LOCKS;
SELECT * FROM information_schema.INNODB_LOCK_WAITS;

These queries can help you identify which transactions are blocked, what locks they are waiting for, and who holds them.

Set up monitoring and early warning mechanisms (advanced suggestions)

Although Navicat can manually complete the above operations, in production environments, it is recommended to automatically detect deadlocks and alarms with scripts or monitoring tools. you can:

• Write timed tasks to execute SHOW ENGINE INNODB STATUS regularly and parse the results;
• Use Nagios, Prometheus and other monitoring systems to integrate database metrics;
• Cooperate with the log collection system to store deadlock information centrally and analyze it.

In this way, even if you don’t log in to Navicat often, you can know whether there is a deadlock problem in the system as soon as possible.

Basically that's it. After mastering these methods, troubleshooting deadlocks no longer depends entirely on the command line, and can also be completed efficiently with Navicat.

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