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POMySQL very slow for alter table query
 

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  1. POMySQL very slow for alter table query
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    <p>Why is it taking more than an hour to simply update this table to add a column? This table has 15M rows. It has 2 indexes and a single key primary key. The ALTER TABLE query has been in "copy to tmp table" state for 1 hour 15 minutes now.</p> <pre><code>ALTER TABLE `frugg`.`item_catalog_map` ADD COLUMN `conversion_url` TEXT NULL DEFAULT NULL </code></pre> <p>Table:</p> <pre><code>mysql&gt; describe item_catalog_map; +------------------------+---------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +------------------------+---------------+------+-----+---------+-------+ | catalog_unique_item_id | varchar(255) | NO | PRI | NULL | | | catalog_id | int(11) | YES | MUL | NULL | | | item_id | int(11) | YES | MUL | NULL | | | price | decimal(10,2) | YES | | 0.00 | | +------------------------+---------------+------+-----+---------+-------+ mysql&gt; show index from item_catalog_map; +------------------+------------+----------------------+--------------+------------------------+-----------+-------------+----------+--------+------+------------+---------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | +------------------+------------+----------------------+--------------+------------------------+-----------+-------------+----------+--------+------+------------+---------+ | item_catalog_map | 0 | PRIMARY | 1 | catalog_unique_item_id | A | 15485115 | NULL | NULL | | BTREE | | | item_catalog_map | 1 | IDX_ACD6184FCC3C66FC | 1 | catalog_id | A | 18 | NULL | NULL | YES | BTREE | | | item_catalog_map | 1 | IDX_ACD6184F126F525E | 1 | item_id | A | 15485115 | NULL | NULL | YES | BTREE | | +------------------+------------+----------------------+--------------+------------------------+-----------+-------------+----------+--------+------+------------+---------+ </code></pre>
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    1. USDavid Parks
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    1. COMay be this thread with similar question will help you out...http://stackoverflow.com/questions/1359097/mysql-alter-table-on-very-large-table-is-it-safe-to-run-it
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      1. USMudassir Hasan
    2. COGo through this thread also...http://stackoverflow.com/questions/5677932/optimize-mysql-for-faster-alter-table-add-column
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      1. USMudassir Hasan
    3. COIt would be cool if there was some kind of progress bar, status message or at the very least a spinning cursor, LOL. Especially since the "modify column" has taken my site offline.
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