MySQL error 3004 appears when GET STACKED DIAGNOSTICS runs outside an active condition handler in a stored program.
MySQL error 3004 ER_GET_STACKED_DA_WITHOUT_ACTIVE_HANDLER happens when GET STACKED DIAGNOSTICS is executed while no handler is active. Move the statement inside a DECLARE ... HANDLER block or capture diagnostics within the handler to resolve the problem.
ER_GET_STACKED_DA_WITHOUT_ACTIVE_HANDLER
MySQL raises error 3004 when a GET STACKED DIAGNOSTICS statement executes even though no condition handler is running. The command can only read diagnostic information saved by an active handler, so without that context MySQL rejects the call.
The issue occurs inside stored procedures, functions, triggers, or events that use DECLARE ... HANDLER. Ordinary SQL scripts executed in a client will never encounter it.
Calling GET STACKED DIAGNOSTICS during normal control flow where no SIGNAL or handler fired triggers the error because the diagnostics area is empty.
Placing the diagnostics line outside the intended handler or copying it into the main procedure body is the primary culprit. A handler that never activates also leaves the diagnostics area unavailable.
Always move the GET STACKED DIAGNOSTICS statement into the body of a DECLARE ... HANDLER that captures the conditions you need.
If diagnostics are required later, first store them in local variables inside the handler, then reference those variables outside the handler block.
Silent failure checks - Developers sometimes attempt to fetch diagnostics after calling a routine instead of using a handler. Replace that pattern with a proper CONTINUE or EXIT handler.
Multiple handlers - When several handlers exist, ensure the correct one saves diagnostics. Use unique labels and keep diagnostics code inside the relevant handler.
Write GET STACKED DIAGNOSTICS as the first line inside every handler that needs it and store results in variables before leaving the block.
Enable code reviews or Galaxy's linting to flag diagnostics statements placed outside handlers. Include automated procedure tests in CI pipelines to catch handler-related errors early.
Error 1360 ER_SP_LILABEL_MISMATCH occurs when END labels do not match opening labels. Correct the labels.
Error 1403 ER_SP_LABEL_REDEFINE appears if the same label is declared twice. Rename or remove duplicates.
The diagnostics line sits in normal procedure flow instead of inside a DECLARE ... HANDLER block.
A handler exists, but the code path calling GET STACKED DIAGNOSTICS runs when no error occurred, leaving the handler inactive.
LEAVE, ITERATE, or RETURN statements skip the handler that would populate the diagnostics area.
Versions before 5.7.3 do not support stacked diagnostics, so any call raises error 3004.
Raised when an END label does not match the block's opening label.
Occurs if a label is declared more than once in a stored program.
Thrown when SIGNAL is used improperly or with an invalid SQLSTATE.
No. The statement is valid only inside stored programs, not in standalone SQL batches.
Support begins in MySQL 5.7.3. Earlier versions reject the syntax.
It only interrupts execution flow and does not impact performance.
Galaxy's linting flags diagnostics outside handlers and its AI copilot suggests proper placement, preventing error 3004.
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