On Thu, 2009-01-08 at 11:37 +1100, Ross McKay wrote: > Richard Heyes wrote: > > >I've not come across many databases where 20-50 tables have 10 million > >rows each. And with a table of that size, then I might be coerced into > >thinking about the storage requirements a little more. Maybe. > > Not on MySQL, but I've worked on databases with hundreds of millions of > rows, in multiple tables. Converting varchars to chars would mean huge > amounts of expensive SAN storage, plus the overheads of scanning through > rows on disc suddenly become important. > > Maybe not applicable to little website databases, but again... know your > data and pick the appropriate type. I use a mix of char, varchar and > text depending on the requirements. And enum :) > > >> Now add another 20 to 50 tables depending on > >> the database. If you want to throw away money go ahead, but I don't know > >> too many clients that want to waste 10 gigs of mostly padded space. > > > >I don't know of many clients who care as long as it is performant and > >cost effective. Wasting 10 Gigs is not a great deal when you have a > >drive measured in the hundreds of Gigs. > > Performant isn't a word - Microsoft marketing term. > > Wasting 10GB is important when it's expensive storage, backed up, > replicated, transferred to other systems over comms links, etc. It also > means more disc access, unless you have a surplus 10GB RAM for extra > caching. Disc access is usually what kills database performance. > -- > Ross McKay, Toronto, NSW Australia > "Let the laddie play wi the knife - he'll learn" > - The Wee Book of Calvin > enum is just so useful! I just haven't found the equivalent in mssql. I find the mssql offering distinctly lacking in places, especially with tools to manipulate it. mysql on the other hand is no only more powerful and friendlier, but a darn site faster too! sorry to troll, but i had a really bad week with mssql, and a very good one with mysql, and thought i'd share the love/hate thing i got going on! Ash www.ashleysheridan.co.uk -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
