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If a function receives a single-dimension array, you may declare its formal parameter in one of three ways: as a pointer, as a sized array, or as an unsized array For example, to receive i, a function called func1( ) can be declared as

TF = x(s + r + btt) + s + r + btt = (x + 1)(s + r + btt)

3

3-55

void func1(int *x) /* pointer */ {

where x is given by Eq 5-26 If each index can be kept compactly on a single cylinder, then some seeks can be avoided, so that TF = 2s + (x + 1)(r + btt) compact index 3-56

value is always automatically generated The BY DEFAULT clause allows a user to specify a value, overriding the automatic value generation

Get-Next Record of an Indexed File The search for a successor record is based on the assumption that the last index block is kept available in a bu er, so that only a new data record has to be fetched

4:

3-57

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1, since the probability This holds as long as the e ective fanout ratio yeff that the current index block contains also the TID of the next record is P d = (yeff 1)/yeff If indeed a successor index block is needed, the second-level index block has to be accessed to locate the successor If the second-level block is not kept in a memory bu er as well, two block accesses are needed with a frequency of 1 P d The frequency of having to access a third- or higher-level index block is generally negligible To add a record to an indexed le, the record is placed in any free area, and then all a indexes referring to existing attributes for this record have to be updated The insertion process will have to nd for each index the a ected index block by searching from the root block of each index, and rewrite an updated index block at level 1; we will call this time Tindex With a probability of Ps = 1/(y/2) = 2/y there will be a block split A block split requires

<Column-Definition>: ColumnName DataType [ <Default-Specification> ] [ <Embedded-Column-Constraint>+ ] <Default-Specification>: { DEFAULT { DefaultValue I USER I NULL} I GENERATED {ALWAYS I BY DEFAULT } AS IDENTITY START WITH NumericConstant [ INCREMENT BY NumericConstant ] }

}

The tree-structured le presented as alternative 1 of this example uses blocks densely and will hence be much harder to update than the B-tree le of alternative 2 As a third alternative we will evaluate a dense index, one that is also hard to update The same considerations of record anchors versus block anchors apply, but the fanout is greater With block anchoring this case is the indexed-sequential le design presented in Sec 3-3 Record-anchored Cases a and b y = 1000 = 76 13 Block-anchored Case a Case b also y = 76 y = 76 x = log76 4 000 = 2

x = log76 304 = 2 x = log76 20 000 = 229 = 3 Fetching a record requires also here one more access to the le; hence TF = (x + 1)(s + r + btt) = 4(s + r + btt) 3(s + r + btt) if no over ows have occurred

Conformance to the SQL:2003 syntax for the GENERATED clause varies among DBMSs IBM DB2 conforms closely to the syntax Microsoft SQL Server uses slightly dif ferent syntax and only supports the ALWAYS option unless a SET IDENTITY statement is also used Microsoft Access provides the AutoNumber data type to generate unique values Oracle uses sequence objects in place of the GENERATED clause Oracle sequences have similar features except that users must maintain the association between a sequence and a column, a burden not necessary with the SQL:2003 standard The following examples contrast the SQL:2003 and Oracle approaches for automatic value generation Note that the primary key constraint is not required for columns with generated values although generated values are mostly used for primary keys The Oracle example contains two statements: one for the sequence creation and another for the table creation Because sequences are not associated with columns, Oracle provides functions that should be used when inserting a row into a table In contrast, the usage of extra func tions is not necessary in SQL:2003

void func1(int x[10]) /* sized array */ { }

3(s + r + btt)

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