
http://forum.opencart.com/viewtopic.php?f=112&t=70406
Basically, post a server move (terrible caching issues) the Import/Export tool is outputting corrupt files. The excel file should be around 800k. I'm getting a tiny 4k file outputted with the info inside reading:
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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 `product` p LEFT JOIN `product_description` pd ON p.product_id=pd.product_id AND pd.language_id=1 LEFT JOIN `product_to_category` pc ON p.product_id=pc.product_id LEFT JOIN `url_alias` ua ON ua.query=CONCAT('product_id=',p.product_id) LEFT JOIN `manufacturer` m ON m.manufacturer_id = p.manufacturer_id LEFT JOIN `weight_class_description` wc ON wc.weight_class_id = p.weight_class_id AND wc.language_id=1 LEFT JOIN `length_class_description` mc ON mc.length_class_id=p.length_class_id AND mc.language_id=1 LEFT JOIN `product_related` pr ON pr.product_id=p.product_id LEFT JOIN `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;
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I'm guessing the config on the new server does not match that of the old where the tool was working perfectly.
I'm trying to research what may be causing the issue but am not developer so it's sort of like wading through Russian

The max_join_size error it seems might be caused by an MySql config setting. I'm guessing I've just hit a limit on this new server with my latest import of products and now the thing falls over due to too many tables when trying to read the Excel file?
The Excel file stands at around 800k. Can I play with the MySQL config max_join_size limit somehow?