Advanced SQL Database Programmers Handbook

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But how much trouble would be avoided if someone went to the database, looked at trends, and increased or changed things before they broke? Preventive maintenance could be done to the to the database as well as to the source code. For example, imagine that every month the average length of a VARCHAR(n) column in a table is getting longer. Why not make the column's upper bound greater with an ALTER TABLE now to avoid future problems? On the other hand, could performance be improved by altering a column to a smaller sized datatype, say INTEGER to SMALLINT?

From a logical viewpoint, this redefinition makes no sense at all. It is confusing the numeral with the number that the numeral represents. Early SQL and Contiguous Storage The early SQLs were based on existing file systems. The data was kept in physically contiguous disk pages, in physically contiguous rows, made up of physically contiguous columns — in short, just like a deck of punch cards or a magnetic tape. You 46 SQL Database Programmers Handbook located data by counting its position in the deck, starting at the front.

There is a proposal in the international timing community to redefine UTC to avoid the discontinuities due to leap seconds. jhtml). The major reason they give for wanting to change the current system is to keep spread-spectrum communication systems and satellite navigation systems compatible with each other and with civil times. Another reason is the emerging need in the financial community to keep all computer time-stamps synchronized, which is where us database people need to start worrying about what we are doing on the Internet and communications networks.

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