In MySQL 5.5, the InnoDB Plugin is the default version and it's compiled in. In this case, the plugin cannot be uninstalled and we get error when trying to do so: mysql> uninstall plugin innodb; ERROR 1305 (42000): PLUGIN innodb does not exist But the error message is misleading. The plugin does exist, it just cannot be installed because it's not dynamically loaded. MySQL bug report: http://bugs.mysql.com/bug.php?id=51771 MariaDB bug report: https://mariadb.atlassian.net/browse/MDEV-4573 MariaDB fix: http://bazaar.launchpad.net/~maria-captains/maria/5.5/revision/3802 diff -up mysql-5.5.33/include/mysql.h.p30 mysql-5.5.33/include/mysql.h --- mysql-5.5.33/include/mysql.h.p30 2013-07-15 14:01:50.000000000 +0200 +++ mysql-5.5.33/include/mysql.h 2013-08-20 17:26:56.745334059 +0200 @@ -134,6 +134,7 @@ typedef unsigned long long my_ulonglong; /* backward compatibility define - to be removed eventually */ #define ER_WARN_DATA_TRUNCATED WARN_DATA_TRUNCATED +#define WARN_PLUGIN_DELETE_BUILTIN ER_PLUGIN_DELETE_BUILTIN typedef struct st_mysql_rows { struct st_mysql_rows *next; /* list of rows */ diff -up mysql-5.5.33/mysql-test/r/plugin.result.p30 mysql-5.5.33/mysql-test/r/plugin.result --- mysql-5.5.33/mysql-test/r/plugin.result.p30 2013-07-15 14:01:49.000000000 +0200 +++ mysql-5.5.33/mysql-test/r/plugin.result 2013-08-20 17:26:56.746334059 +0200 @@ -143,3 +143,5 @@ SELECT @@SESSION.example_double_thdvar; @@SESSION.example_double_thdvar 1000.500000 UNINSTALL PLUGIN example; +UNINSTALL PLUGIN MyISAM; +ERROR HY000: Built-in plugins cannot be deleted diff -up mysql-5.5.33/mysql-test/t/plugin.test.p30 mysql-5.5.33/mysql-test/t/plugin.test --- mysql-5.5.33/mysql-test/t/plugin.test.p30 2013-07-15 14:01:49.000000000 +0200 +++ mysql-5.5.33/mysql-test/t/plugin.test 2013-08-20 17:26:56.746334059 +0200 @@ -137,3 +137,10 @@ SET SESSION example_double_thdvar = 1000 SELECT @@SESSION.example_double_thdvar; UNINSTALL PLUGIN example; + +# +# MDEV-4573 UNINSTALL PLUGIN misleading error message for non-dynamic plugins +# +--error ER_PLUGIN_DELETE_BUILTIN +UNINSTALL PLUGIN MyISAM; + diff -up mysql-5.5.33/sql/share/errmsg-utf8.txt.p30 mysql-5.5.33/sql/share/errmsg-utf8.txt --- mysql-5.5.33/sql/share/errmsg-utf8.txt.p30 2013-07-15 14:01:50.000000000 +0200 +++ mysql-5.5.33/sql/share/errmsg-utf8.txt 2013-08-20 17:26:56.750334057 +0200 @@ -6161,7 +6161,7 @@ WARN_NO_MASTER_INFO WARN_OPTION_IGNORED eng "<%-.64s> option ignored" ger "Option <%-.64s> ignoriert" -WARN_PLUGIN_DELETE_BUILTIN +ER_PLUGIN_DELETE_BUILTIN eng "Built-in plugins cannot be deleted" ger "Eingebaute Plugins können nicht gelöscht werden" WARN_PLUGIN_BUSY diff -up mysql-5.5.33/sql/sql_plugin.cc.p30 mysql-5.5.33/sql/sql_plugin.cc --- mysql-5.5.33/sql/sql_plugin.cc.p30 2013-08-20 17:26:56.640334104 +0200 +++ mysql-5.5.33/sql/sql_plugin.cc 2013-08-20 17:26:56.752334057 +0200 @@ -1909,9 +1909,7 @@ bool mysql_uninstall_plugin(THD *thd, co } if (!plugin->plugin_dl) { - push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, - WARN_PLUGIN_DELETE_BUILTIN, ER(WARN_PLUGIN_DELETE_BUILTIN)); - my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PLUGIN", name->str); + my_error(ER_PLUGIN_DELETE_BUILTIN, MYF(0)); goto err; } if (plugin->load_option == PLUGIN_FORCE_PLUS_PERMANENT)