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Re: Dumping enormous MYISAM table with BLOB based on WHERE clause
Posted by: Rick James
Date: January 29, 2015 04:59PM

While I have your attention...

What is in those LONGBLOBs? Text? Pictures? In particular, is it something compressible? English compresses 3:1. Shrinking the row sizes will let you keep more rows and run faster. Faster is because of less I/O.

When DESCRIBEing a table, please use SHOW CREATE TABLE, it is more descriptive. For one thing, it shows the indexes, and indexes are a significant thing to consider when having 500GB tables and when using PARTITIONing. There are a few caveats on indexing; I can't see what index issues I may need to advise you on.

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