Error
Error Code:
1317
MariaDB Error 1317: Query Interrupted
Description
This error signifies that a database query was stopped before it could finish executing. It commonly occurs due to client disconnections, server shutdowns, explicit query termination, or network issues interrupting the communication mid-query.
Error Message
Query execution was interrupted
Known Causes
4 known causesClient Application Disconnection
The application or client tool that initiated the query disconnected or crashed before the query completed, breaking the connection.
MariaDB Server Restart
The MariaDB server was shut down, restarted, or crashed while a query was actively running, forcing its termination.
Manual Query Termination
An administrator or another user explicitly terminated the running query using commands like `KILL QUERY` or `KILL CONNECTION`.
Network Connectivity Issues
Unstable or dropped network connections between the client and the MariaDB server can interrupt a query mid-execution.
Solutions
3 solutions available1. Increase Query Timeout Settings medium
Adjust server-side or client-side timeouts to allow longer query execution.
1
Identify the source of the interruption. If the interruption is occurring consistently after a certain duration, it might be due to a timeout setting. Check both server-side and client-side configurations.
2
For server-side timeouts, you can adjust the `wait_timeout` and `interactive_timeout` variables in your MariaDB configuration file (`my.cnf` or `my.ini`). Set them to a higher value. For example, to set them to 24 hours (86400 seconds):
[mysqld]
wait_timeout = 86400
interactive_timeout = 864003
After modifying the configuration file, restart the MariaDB service for the changes to take effect.
sudo systemctl restart mariadb4
If you are using a specific client application or connector, check its documentation for any query timeout settings and increase them accordingly. For example, in Python with `mysql.connector`, you might set a `connect_timeout` or `read_timeout`.
2. Optimize Slow Queries advanced
Analyze and rewrite inefficient SQL queries to reduce execution time.
1
Enable the slow query log in MariaDB to capture queries that exceed a certain execution time. You can configure this in your `my.cnf` or `my.ini` file. Set `slow_query_log` to `1` and `long_query_time` to a reasonable value (e.g., 5 seconds).
[mysqld]
slow_query_log = 1
long_query_time = 52
Restart the MariaDB service after updating the configuration.
sudo systemctl restart mariadb3
Locate the slow query log file (its path is usually defined by `slow_query_log_file` in the configuration) and analyze the queries listed. Tools like `mysqldumpslow` can help summarize and identify the most problematic queries.
mysqldumpslow /var/log/mysql/mysql-slow.log4
For each identified slow query, use `EXPLAIN` to understand its execution plan. Look for full table scans, inefficient joins, or missing indexes. For example:
EXPLAIN SELECT * FROM your_table WHERE some_column = 'some_value';5
Optimize the query by adding appropriate indexes to tables, rewriting joins, or simplifying the query logic. For instance, if a query is slow due to a missing index on `some_column`:
CREATE INDEX idx_some_column ON your_table (some_column);3. Investigate Server Resource Constraints medium
Check for hardware or system-level limitations impacting query performance.
1
Monitor the server's CPU, memory, and disk I/O usage while the query is running. High utilization in any of these areas can lead to query interruptions.
top
htop
iostat2
Check MariaDB's error log for any related system errors or warnings that might indicate resource exhaustion.
sudo tail -f /var/log/mysql/error.log3
If the server is consistently under heavy load, consider upgrading hardware resources (CPU, RAM) or optimizing other processes running on the server that might be consuming excessive resources.
4
Ensure that MariaDB's buffer pool (`innodb_buffer_pool_size`) is adequately sized for your workload. An undersized buffer pool can lead to frequent disk reads, slowing down queries.
[mysqld]
innodb_buffer_pool_size = 2G # Adjust based on your server's RAM5
Restart MariaDB after any configuration changes.
sudo systemctl restart mariadb