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Re: ERROR 1025 (HY000): Error on rename of '.\reporting\#sql-a2c_1' to '.\reporting\event' (errno: -1)
Posted by: Rick James
Date: August 24, 2014 09:14PM


The first of these is redundant and can (should) be dropped:
KEY `landscape_idx` (`landscape_h`),
KEY `landscape_and_time_idx` (`landscape_h`,`time`),

It looks like you are setting up 'weekly' partitions? You have only 3 to start with; you will be adding more as time goes on? And you won't be DROPping old partitions?

What do you hope to gain by PARTITIONs? Only in certain situations will you get any performance boost.

> memory 8GB.

What is the value of innodb_buffer_pool_size? I would expect 5-6GB.

> tmp_table_size = 1G
> max_heap_table_size = 1G

These large values can hurt you if there is a sudden rush of connections needing tmp tables.

> Size of the db is 280GB and the free space available on HD is 360GB

Sounds sufficient for the ALTER.

> UNIQUE KEY `event_id_model_key_idx` (`event_id`,`model_key`,`time`),

If you don't really need it to be UNIQUE, the ALTER will probably run a lot faster with an ordinary (non-UNIQUE) INDEX.

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