Why do databases crash

There are several reasons for this: 1. Other processes are modifying a data or index that is written by the database without accurate locking.

Database server processes are using the same data directory in the host system that does not contain support for good file system locking or external file locking. This can disable the database servers. Systems can fail when you do not have a proactive DBA who has foresight and planning solution skills. They can check data integrity, monitor the logs, catch problems, scale your system needs, and optimize performance space. This takes constant planning and critical organization in order to prevent system crashes that can seriously harm your database, as well as your business.

By taking these 7 reasons for database failures in mind, choose a DBA that can provide you immediate results. If you need to hire a DBA, please speak to Abtech first. We can reduce the cost and increase the quality of maintenance on your database servers.

We are here for you! This means that you cannot run two mysqld servers on the same data directory and that you must be careful if you use myisamchk. Nevertheless, it may be instructive to try the option as a test. If mysqld appears to be running but not responding, try mysqladmin -u root processlist. Sometimes mysqld is not hung even though it seems unresponsive. The problem may be that all connections are in use, or there may be some internal lock problem.

Run the command mysqladmin -i 5 status or mysqladmin -i 5 -r status in a separate window to produce statistics while running other queries.

Start mysqld from gdb or another debugger. Print the backtrace and the local variables at the three lowest levels. In gdb , you can do this with the following commands when mysqld has crashed inside gdb :. With gdb , you can also examine which threads exist with info threads and switch to a specific thread with thread N , where N is the thread ID.

Send a normal bug report. Be even more detailed than usual. Because MySQL works for many people, the crash might result from something that exists only on your computer for example, an error that is related to your particular system libraries. This forces MySQL to use fixed-size rows. Fixed-size rows take a little extra space, but are much more tolerant to corruption. The current dynamic row code has been in use for several years with very few problems, but dynamic-length rows are by nature more prone to errors, so it may be a good idea to try this strategy to see whether it helps.

Consider the possibility of hardware faults when diagnosing problems. Defective hardware can be the cause of data corruption. Pay particular attention to your memory and disk subsystems when troubleshooting hardware. InnoDB Cluster. InnoDB ReplicaSet. Error Messages and Common Problems. Error Message Sources and Elements. Can't connect to [local] MySQL server. Lost connection to MySQL server. Asked 9 years, 8 months ago.

Active 3 years, 9 months ago. Viewed 33k times. I could just restore a backup, but I guess there are ways to prevent crashes. Why does a MySQL table crash? What can I do to prevent that from happening? Improve this question. AeroCross AeroCross 1 1 gold badge 4 4 silver badges 8 8 bronze badges.

Add a comment. Active Oldest Votes. Improve this answer. Community Bot 1. Excellent response. Didn't know the bit of the file handles, and you've already solved how can I prevent or automatically repair in case something goes wrong.

Noob here. Where do I "run" this code? From a file uploaded to the server or from some command line? Kevin Kevin 21 2 2 bronze badges. Unfortunately, we don't see the problem resolve itself when space is cleared, or it doesn't resolve itself in a timely enough fasion. Dmitry Dmitry 1. The code may be ok for that but it doesn't answer the first part question Why does a MySQL table crash?