import/export tool error

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Error: The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET SQL_MAX_JOIN_SIZE=# if the SELECT is okay<br />Error No: 1104<br />SELECT   p.product_id,  pd.name,  GROUP_CONCAT( DISTINCT CAST(pc.category_id AS CHAR(11)) SEPARATOR "," ) AS categories,  p.sku,  p.location,  p.quantity,  p.model,  m.name AS manufacturer,  p.image AS image_name,  p.shipping,  p.price,  p.date_added,  p.date_modified,  p.date_available,  p.weight,  wc.unit,  p.length,  p.width,  p.height,  p.status,  p.tax_class_id,  p.viewed,  p.sort_order,  pd.language_id,  ua.keyword,  pd.description,   pd.meta_description,   pd.meta_keywords,   p.stock_status_id,   mc.unit AS length_unit,   p.subtract,   p.minimum,   p.cost,   GROUP_CONCAT( DISTINCT CAST(pr.related_id AS CHAR(11)) SEPARATOR "," ) AS related,   GROUP_CONCAT( DISTINCT pt.tag SEPARATOR "," ) AS tags FROM `op149_product` p LEFT JOIN `op149_product_description` pd ON p.product_id=pd.product_id   AND pd.language_id=1 LEFT JOIN `op149_product_to_category` pc ON p.product_id=pc.product_id LEFT JOIN `op149_url_alias` ua ON ua.query=CONCAT('product_id=',p.product_id) LEFT JOIN `op149_manufacturer` m ON m.manufacturer_id = p.manufacturer_id LEFT JOIN `op149_weight_class_description` wc ON wc.weight_class_id = p.weight_class_id   AND wc.language_id=1 LEFT JOIN `op149_length_class_description` mc ON mc.length_class_id=p.length_class_id   AND mc.language_id=1 LEFT JOIN `op149_product_related` pr ON pr.product_id=p.product_id LEFT JOIN `op149_product_tags` pt ON pt.product_id=p.product_id   AND pt.language_id=1 GROUP BY p.product_id ORDER BY p.product_id, pc.category_id;