EC
2010
MariaDBERRORNotableUDFHIGH confidence

Cannot open shared library for UDF

Production Risk

Low — UDF creation is rejected.

What this means

MySQL could not open the shared library (.so / .dll) specified in a CREATE FUNCTION (UDF) statement. The file may not exist in plugin_dir, may have wrong permissions, or may have unresolved symbol dependencies.

Why it happens
  1. 1Library file not present in plugin_dir.
  2. 2File permissions prevent the MySQL process from reading the library.
  3. 3Missing dependencies (shared library depends on another .so not installed).
  4. 4Wrong architecture (e.g. 32-bit library on a 64-bit server).
How to reproduce
trigger — this will error
trigger — this will error
CREATE FUNCTION my_func RETURNS STRING SONAME 'nonexistent.so';

expected output

ERROR 2010 (HY000): Can't open shared library 'nonexistent.so' (errno: 22 No such file or directory).

Fix 1

Verify the library exists in plugin_dir with correct permissions

Verify the library exists in plugin_dir with correct permissions
SHOW VARIABLES LIKE 'plugin_dir';
-- Then: ls -la /path/to/plugin_dir/myfunc.so

Why this works

The library must be readable by the MySQL process user.

Fix 2

Install missing library dependencies

Install missing library dependencies
-- On Linux: ldd /path/to/plugin_dir/myfunc.so

Why this works

Unresolved dependencies prevent dlopen() from loading the library.

What not to do

✕

Sources
Official documentation ↗

MySQL 8.0 — 2010 ER_CANT_OPEN_LIBRARY

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