MySQL throws warning 3089 when a SET statement updates a system variable that will become read-only in future versions.
ER_WARN_DEPRECATED_SYSVAR_UPDATE appears when you SET a system variable marked as deprecated for updates. Replace the variable or remove the SET command to stay forward-compatible - the primary fix is to stop updating the soon-to-be read-only variable.
ER_WARN_DEPRECATED_SYSVAR_UPDATE
MySQL returns warning code 3089 when a client issues a SET GLOBAL or SET SESSION statement for a system variable that the server has flagged as deprecated for updates. The variable still changes value, but MySQL alerts you that future versions will make it read-only, turning this warning into a hard error.
The condition name ER_WARN_DEPRECATED_SYSVAR_UPDATE was introduced in MySQL 5.7.6 and continues in MySQL 8.0. Addressing the warning now prevents application failures after an upgrade.
The server maintains an internal list of variables scheduled to become immutable. When your code updates any item in that list, MySQL emits warning 3089. Typical triggers include legacy scripts that still adjust query_cache_type or sql_mode on connection startup.
Running SET PERSIST or editing my.cnf for these variables can also surface the warning during server restart because the deprecated change is applied at boot time.
The safest fix is to stop modifying the affected variable. Review your application, stored procedures, connection pool initializers, and configuration files for SET statements that reference it.
If the variable is essential today, migrate to the recommended alternative documented by MySQL. For example, migrate away from query cache settings toward statement or result caching at the application layer.
Startup scripts often issue SET GLOBAL sql_mode='STRICT_ALL_TABLES' even though sql_mode might become static. Remove the statement and set sql_mode in my.cnf instead, where it remains legal.
Replication setups sometimes toggle log_bin_trust_function_creators dynamically. Move that change to configuration files or redesign routines to work with its default value.
Keep your MySQL server and client libraries updated and monitor the release notes for deprecation notices. Treat warnings as deploy-blocking signals in CI so code never ships with deprecated variable updates.
Centralize connection initialization logic so you can audit all SET statements in one place. Tools like Galaxy make it easy to search your query baseline for deprecated syntax.
Error 1238 ER_INCORRECT_GLOBAL_LOCAL can occur if you attempt to set a variable that is scope-locked. Unlike 3089, it is an immediate error, so fix by using the correct scope.
Error 3090 ER_WARN_DEPRECATED_SYSVAR_READ is raised when simply reading a deprecated variable. The resolution is similar: move to the new variable or feature.
Legacy scripts or ORMs still run SET GLOBAL statements for variables that MySQL has slated for removal.
An upgrade leaves old my.cnf entries in place. On startup the server applies them and raises the warning.
Third-party management tools may toggle variables automatically, unaware of the deprecation timeline.
Raised when reading a deprecated variable. Avoid by referencing the supported replacement.
Occurs when setting a variable with the wrong scope. Fix by adding GLOBAL or SESSION correctly.
Signals that the variable you are trying to set does not support the requested scope.
No. It is a warning, but ignoring it will cause failures when the variable becomes read-only.
The warning first appeared in 5.7.6 and persists in all 8.0 releases.
Query performance_schema.variables_info and filter where DEPRECATED='YES' and UPDATE_TYPE='DYNAMIC'.
Yes. Galaxy's workspace search lets you scan every saved query and script for SET commands touching deprecated variables.
.avif)
.avif){kind=logo}
