Warning
Error Code:
1745
MariaDB Error 1745: Binlog Cache Size Mismatch
Description
This warning indicates that the configured `binlog_stmt_cache_size` variable has a value greater than `max_binlog_stmt_cache_size`. MariaDB automatically adjusts `binlog_stmt_cache_size` down to match `max_binlog_stmt_cache_size`, preventing potential resource issues but highlighting a configuration inconsistency.
Error Message
Option binlog_stmt_cache_size (%lu) is greater than max_binlog_stmt_cache_size (%lu); setting binlog_stmt_cache_size equal to max_binlog_stmt_cache_size.
Known Causes
3 known causesbinlog_stmt_cache_size set too high
The `binlog_stmt_cache_size` variable has been explicitly configured with a value that exceeds the `max_binlog_stmt_cache_size` limit.
max_binlog_stmt_cache_size set too low
The `max_binlog_stmt_cache_size` variable has been explicitly configured with a value that is lower than the desired `binlog_stmt_cache_size`.
Conflicting configuration updates
Changes were made to one of the binlog cache size parameters without considering the interdependent value of the other, leading to an inconsistent configuration state.
Solutions
3 solutions available1. Increase max_binlog_stmt_cache_size easy
Adjust the global maximum allowed statement cache size to accommodate the desired binlog cache size.
1
Connect to your MariaDB server using a client like `mysql`.
mysql -u your_user -p2
Check the current values of `max_binlog_stmt_cache_size` and `binlog_stmt_cache_size`.
SHOW VARIABLES LIKE 'max_binlog_stmt_cache_size';
SHOW VARIABLES LIKE 'binlog_stmt_cache_size';3
Increase `max_binlog_stmt_cache_size` to be greater than or equal to the current `binlog_stmt_cache_size`. This can be done dynamically for the current session or permanently.
SET GLOBAL max_binlog_stmt_cache_size = 1073741824; -- Example: Set to 1GB (1024*1024*1024 bytes)4
To make this change permanent, edit your MariaDB configuration file (e.g., `my.cnf` or `mariadb.conf.d/50-server.cnf`). Find or add the `max_binlog_stmt_cache_size` parameter under the `[mysqld]` section and set it to your desired value. Restart MariaDB for the change to take effect.
[mysqld]
max_binlog_stmt_cache_size = 10737418242. Decrease binlog_stmt_cache_size easy
Reduce the statement cache size to be within the allowed maximum.
1
Connect to your MariaDB server using a client like `mysql`.
mysql -u your_user -p2
Check the current values of `max_binlog_stmt_cache_size` and `binlog_stmt_cache_size`.
SHOW VARIABLES LIKE 'max_binlog_stmt_cache_size';
SHOW VARIABLES LIKE 'binlog_stmt_cache_size';3
Set `binlog_stmt_cache_size` to a value less than or equal to `max_binlog_stmt_cache_size`. This can be done dynamically for the current session or permanently.
SET GLOBAL binlog_stmt_cache_size = 262144; -- Example: Set to 256KB (256*1024 bytes), assuming max_binlog_stmt_cache_size is smaller4
To make this change permanent, edit your MariaDB configuration file (e.g., `my.cnf` or `mariadb.conf.d/50-server.cnf`). Find or add the `binlog_stmt_cache_size` parameter under the `[mysqld]` section and set it to your desired value. Restart MariaDB for the change to take effect.
[mysqld]
binlog_stmt_cache_size = 2621443. Review and Optimize Application's Statement Caching medium
Investigate if your application is unnecessarily setting a large `binlog_stmt_cache_size` and adjust its configuration.
1
Identify how `binlog_stmt_cache_size` is being set. It's usually set in the MariaDB configuration file (`my.cnf` or similar) or via `SET GLOBAL` commands. If your application directly influences this setting, review its configuration.
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Analyze the statements being executed by your application. Large or complex statements, especially those within transactions, can consume significant statement cache space. Look for opportunities to optimize these statements or break them down.
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If your application is responsible for setting this parameter, ensure it's setting it to a reasonable value based on the expected workload. Avoid setting it excessively high without a clear need.
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Consider the trade-offs: a larger `binlog_stmt_cache_size` can improve performance for complex statements but consumes more memory. A smaller size might lead to more disk I/O for temporary storage if the cache is exceeded.
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