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SQL> Apparently, if you define a view with a query starting with SELECT * FROM ..., the asterisk (*) gets expanded (and stored) as a comma-separated list of column names. Compare the query in Listing 10-1, where you created the DEPT20_V view, with the TEXT column contents in Listing 10-6.



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Given are load quantites of LF = 20 000/day fetch requests LI = 300/day new records, causing overflow o The le has n = 40000 records of length R = 500 on blocks of size B = 2000, the index has a fanout y = 100 We derive Bfr = B/R = 4, x = log100 (n/Bfr) = 2 We assume that the top index level x is in core, also that levels 1 to (x 1) are on the same cylinder as the data and that n/o Bfr, so that we can use Eq 3-34, as derived in Eq 3-38 We simplify the over ow term o /(n + o ) to o/n, since we use o here to denote the current over ow and o n TF =c + s + 2(r + btt) + TY =2n R SI t t o (r + btt) n





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The low ratio of insertions to fetch operations LI /LF = 300/20 000 = 15% permits TI to be ignored Continuing the estimation process, it is assumed that the index SI requires 5% space over the rest of the le and hence a proportionate e ect to rewrite Then CY = 205 n R 05 cost t

Compound conditions consist of multiple subconditions, combined with logical operators. In Section 4.5 of this chapter, you will see how to construct compound conditions by using the logical operators AND, OR, and NOT.

For a 2314-type disk unit the parameters for this le will be r = 0025 s t = 120 000 bytes/s btt = 0005 s and for simplicity, we set the processor cost at cost = $010/s The actual absolute values of these parameters are not very critical since they tend to cancel each other out With this cost CY = $1710 so that tY (optimum) = 87 days and Co = $045/day 2

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The lowest cost as a function of the reorganization interval can be found by taking the derivative with respect to tY and setting it to zero CY 1 P erCo P er 2 = 0 2 tY giving tY (optimal) = 2 CY Co 6-37

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The result of a query is a table; that is, a set of rows. The order in which these rows appear in the result typically depends on two aspects: The strategy chosen by the optimizer to access the data The operations chosen by the optimizer to produce the desired result This means that it is sometimes difficult to predict the order of the rows in the result. In any case, the order is not guaranteed to be the same under all circumstances. If you insist on getting the resulting rows of your query back in a guaranteed order, you must use the ORDER BY clause in your SELECT commands. Figure 4-2 shows the syntax of this clause.

This rule is applied in Example 6-18 to the indexed-sequential le presented in Chap 3-3

For an indexed-sequential le the relationship for Co = f (TF ) is, given the assumptions in the example, linear with respect to o and TY is independent, as required by the assumptions made in the model used to optimize the reorganization time Then r + btt Co = 6-38 n and with one over ow per insertion LI Co = LF LI (r + btt) cost n 6-39

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