EC
1715
MySQLERRORCommonStorage EngineHIGH confidence

Storage engine is out of memory

Production Risk

High — operation fails; application may receive out-of-memory errors.

What this means

The storage engine (typically MEMORY/HEAP) exceeded its maximum memory allocation and cannot complete the requested operation.

Why it happens
  1. 1MEMORY table exceeded max_heap_table_size.
  2. 2Large temporary tables during complex queries.
  3. 3System is under severe memory pressure.
How to reproduce
trigger — this will error
trigger — this will error
SET max_heap_table_size = 1024 * 1024; -- 1 MB
CREATE TABLE t (col TEXT) ENGINE=MEMORY;
-- Insert enough data to exceed 1 MB

expected output

ERROR 1715 (HY000): Out of memory in storage engine.

Fix 1

Increase max_heap_table_size

Increase max_heap_table_size
SET GLOBAL max_heap_table_size = 256 * 1024 * 1024; -- 256 MB

Why this works

Raising the limit allows the MEMORY engine to allocate more memory.

Fix 2

Switch large tables to InnoDB

Switch large tables to InnoDB
ALTER TABLE t ENGINE=InnoDB;

Why this works

InnoDB uses disk-based storage and is not subject to heap table size limits.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 1715 ER_ENGINE_OUT_OF_MEMORY

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