EC
1433
MariaDBERRORNotableConnection / SessionHIGH confidence

Cannot create more prepared statements than max_prepared_stmt_count

Production Risk

High — applications relying on prepared statements will fail to prepare new ones.

What this means

ER_MAX_PREPARED_STMT_COUNT_REACHED (1433, SQLSTATE HY000) is returned when the server-wide limit on prepared statements (max_prepared_stmt_count) has been reached.

Why it happens
  1. 1Application creates prepared statements but does not deallocate them
  2. 2High concurrency with many sessions each holding prepared statements
  3. 3max_prepared_stmt_count set too low for the workload
How to reproduce
trigger — this will error
trigger — this will error
-- Each PREPARE without DEALLOCATE increments the counter:
PREPARE stmt FROM 'SELECT ?';
-- When limit is reached:
-- ERROR 1433 (HY000): Can't create more than max_prepared_stmt_count statements

expected output

ERROR 1433 (HY000): Can't create more than max_prepared_stmt_count statements (current value: 16382)

Fix 1

Deallocate prepared statements after use

Deallocate prepared statements after use
DEALLOCATE PREPARE stmt;

Why this works

Releasing prepared statements frees slots in the global counter.

Fix 2

Increase max_prepared_stmt_count

Increase max_prepared_stmt_count
SET GLOBAL max_prepared_stmt_count = 32768;

Why this works

Raises the server-wide limit, allowing more concurrent prepared statements.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1433 ER_MAX_PREPARED_STMT_COUNT_REACHED

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