CREATE TABLE t1(a int) ENGINE=ARCHIVE;
Warnings:
Warning	1286	Unknown storage engine 'ARCHIVE'
Warning	1266	Using storage engine MyISAM for table 't1'
DROP TABLE t1;
INSTALL PLUGIN archive SONAME 'ha_archive.so';
INSTALL PLUGIN ARCHIVE SONAME 'ha_archive.so';
ERROR HY000: Function 'ARCHIVE' already exists
UNINSTALL PLUGIN archive;
INSTALL PLUGIN archive SONAME 'ha_archive.so';
CREATE TABLE t1(a int) ENGINE=ARCHIVE;
DROP TABLE t1;
SELECT 1;
1
1
UNINSTALL PLUGIN archive;
UNINSTALL PLUGIN archive;
ERROR 42000: PLUGIN archive does not exist