We have a table with 254 columns in it. 80% of the time, a very small subset of these columns are queried. The other columns are rarely, if ever, queried. (But they could be at any time, so we do need to maintain them.). Would I expect to get a marked performance boost if I split my table up into 2 tables, one with the few frequently queried columns and another with less frequently queried ones? Doing this will require a lot of code changes, so I don't want to go down this path if it won't be beneficial. Can folks here offer their experiences and learned opinions about this?
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