/magmi/plugins/base/general/optimizer/magmi_optimizer_plugin.php

<?php
class Magmi_OptimizerPlugin extends Magmi_GeneralImportPlugin
{
	public function getPluginInfo()
	{
		return array("name"=>"Magmi Optimizer",
					 "author"=>"Dweeves",
					 "version"=>"1.0.5",
					 "url"=>"http://sourceforge.net/apps/mediawiki/magmi/index.php?title=Magmi_Optimizer");
	}
	
	public function beforeImport()
	{
		$tbls=array("eav_attribute_option_value"=>array("value","MAGMI_EAOV_OPTIMIZATION_IDX"),
					"catalog_product_entity_media_gallery"=>array("value","MAGMI_CPEM_OPTIMIZATION_IDX"),
					"catalog_category_entity_varchar"=>array("value","MAGMI_CCEV_OPTIMIZATION_IDX"),
					"eav_attribute"=>array("attribute_code","MAGMI_EA_CODE_OPTIMIZATION_IDX"));
		$this->log("Optimizing magmi","info");
		foreach($tbls as $tblname=>$idxinfo)
		{
			try
			{
				$t=$this->tablename($tblname);
				$this->log("Adding index {$idxinfo[1]} on $t","info");
				$sql="ALTER  TABLE $t ADD INDEX {$idxinfo[1]} (`{$idxinfo[0]}`)";
				$this->exec_stmt($sql);
			}
			catch(Exception $e)
			{
				//ignore exception
				$this->log("Already optmized!","info");
			}
		}
		return true;
	}
	
		
	public function initialize($params)
	{
		
	}
}