I upload ~9MB DB dump, Adminer dies here:
get_file( 'sql_file', TRUE )
file_get_contents ( 'compress.zlib:///tmp/phptLdCFh' )
Uploaded files should be parsed & executed iteratively
Uploaded files are read into the memory by some PHP versions anyway. I would suggest copying the file on webserver by FTP and use the "From server" fieldset instead. That one reads the file iteratively.