Before I shoot myself in the foot...

[Brian Dunning]

...if I add a column to a table with 40,000,000 records, will it  
cause that table to hang for any significant amount of time, and  
prevent other transactions? It's a MyISAM table and I was going to  
add a varchar(20) column, NULL. It's a very busy table, constant  
searches and inserts.

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