Error
Error Code:
2046
MySQL Error 2046: Shared Memory Connection Failure
Description
This error occurs when a MySQL client attempts to connect to a local MySQL server using shared memory, but the underlying operating system fails to establish or access the required shared memory segment. It typically indicates a problem with system resources, permissions, or configuration preventing the client from communicating with the server via this Inter-Process Communication (IPC) method.
Error Message
Can't open shared memory; cannot send request event to server (%lu)
Known Causes
4 known causesInsufficient System Resources
The operating system may have exhausted available shared memory segments or other IPC resources, preventing MySQL from allocating what it needs for the connection.
Incorrect Shared Memory Configuration
System-level shared memory parameters (e.g., `kernel.shmmax`, `kernel.shmall` on Linux) might be too restrictive or misconfigured for the MySQL server's requirements.
Permissions Issues
The user account running the MySQL client process may lack the necessary read/write permissions to access the shared memory segments created by the MySQL server.
Stale Shared Memory Segments
A previous abnormal shutdown of MySQL or the system might have left corrupted or stale shared memory segments that interfere with new connection attempts.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service