MySQL cannot read the audit_log_read() UDF because the supplied max_array_length argument is outside the accepted 1-1024 range.
ER_AUDIT_LOG_UDF_READ_INVALID_MAX_ARRAY_LENGTH_ARG_VALUE occurs when audit_log_read() receives a max_array_length outside 1-1024. Supply a value within range or omit the parameter to use the default 32 to resolve the error.
ER_AUDIT_LOG_UDF_READ_INVALID_MAX_ARRAY_LENGTH_ARG_VALUE
MySQL raises error 3218 when the audit_log_read() user-defined function receives a max_array_length parameter that is not between 1 and 1024. The server stops the call and returns the message "Invalid "max_array_length" argument value."
The check was introduced in MySQL 5.7.22 to protect the audit log reader from excessive memory allocation and possible overflow conditions.
The most common trigger is a typo or miscalculation that sets max_array_length to 0, a negative number, or a value larger than 1024.
Some automation scripts pass NULL, an empty string, or a floating-point number, which MySQL casts to an out-of-range integer and triggers the error.
Upgraded servers may inherit legacy code that never specified the parameter limit, now enforced in newer versions.
Validate the argument before calling audit_log_read(). Ensure it is an integer between 1 and 1024. Omit the argument entirely to fall back on the default value of 32.
If the call comes from application code, add a bound-checking routine or use prepared statements that supply a safe constant.
During log rotation scripts, administrators sometimes loop with max_array_length = 2048. Lower the value to 1024 or split the reads into multiple calls.
When reading exceptionally large audit entries, developers try max_array_length = 0 hoping for "unlimited." Replace with successive reads using 1024 until the entire record is fetched.
Always parameterize audit_log_read() calls and clamp the user input to 1-1024.
Use MySQL server variables or configuration files to store safe defaults, preventing ad-hoc scripts from choosing invalid numbers.
Error 3219 ER_AUDIT_LOG_UDF_READ_INVALID_ARRAY_LENGTH_ARG_VALUE occurs when array_length is invalid. The fixes mirror those for max_array_length: supply a number in range.
Error 3220 ER_AUDIT_LOG_UDF_READ_INVALID_READ_MODE_ARG_VALUE fires when read_mode is neither "OLD" nor "NEW"; correct the string to resolve.
Values below 1 or above 1024 immediately trigger the check.
Non-numeric input is cast to 0, which is invalid.
MySQL rounds the float, often creating 0 or a huge integer.
Older scripts that ignored bounds now fail on modern servers.
Triggers on invalid array_length value.
Raised when read_mode is not "OLD" or "NEW".
Occurs if buffer_size falls outside the accepted range.
Any integer from 1 to 1024 is accepted. The default is 32.
While possible, changing server code risks instability and is not recommended in production.
No. MySQL reads the audit log in chunks of 32, which is efficient for most workloads.
Galaxy's AI copilot validates parameters and warns when a value exceeds the MySQL limit before a query is run.
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