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For example, a customer places orders in your order entry system, and these orders are retrieved and processed in a first in, first out (FIFO) manner In such a system, a sorted hash cluster may be the right data structure for you Nested tables: These are part of the object-relational extensions to Oracle They are simply system-generated and maintained child tables in a parent/child relationship They work much in the same way as EMP and DEPT in the SCOTT schema with the EMP table being the nested table EMP is considered to be a child of the DEPT table, since the EMP table has a foreign key, DEPTNO, that points to DEPT The main difference is that they are not stand-alone tables like EMP Temporary tables: These tables store scratch data for the life of a transaction or the life of a session.

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You can generate the lexer by calling fslex: fslex kittyLexer.fsl This produces kittyLexer.fs, which contains the implementation of the lexer.

These tables allocate temporary extents, as needed, from the current user s temporary tablespace Each session will see only the extents that session allocates; it will never see any of the data created in any other session Object tables: These tables are created based on an object type They have special attributes not associated with non-object tables, such as a system-generated REF (object identifier) for each row Object tables are really special cases of heap, index organized, and temporary tables, and they may include nested tables as part of their structure as well External tables: The data in these tables are not stored in the database itself; rather, they reside outside of the database in ordinary operating system files External tables in Oracle9i and above give you the ability to query a file residing outside the database as if it were a normal table inside the database.

They are most useful as a means of getting data into the database (they are a very powerful data-loading tool) Furthermore, in Oracle 10g, which introduces an external table unload capability, they provide an easy way to move data between Oracle databases without using database links We will look at external tables in some detail in 15 Data Loading and Unloading..

Listing 16-7 shows the parser specification for the Kitty language in the file kittyParser.fsy. Listing 16-7. kittyParser.fsy: Parser for Kitty %{ open KittyAst %} // The start token becomes a parser function in the compiled code. %start start // These are the terminal tokens of the grammar along with the types of // the data carried by each token: %token <string> ID %token <int> INT %token PLUS MINUS TIMES LPAREN RPAREN IF THEN ELSE %token WHILE DO BEGIN END PRINT SEMI ASSIGN EOF // Associativity and Precedences - Lowest precedence comes first %left PLUS MINUS %left TIMES // This is the type of the data produced by a successful reduction // of the 'start' symbol: %type <prog> start %% start: Prog Prog: StmtList Expr: | | | | | ID INT Expr PLUS Expr Expr MINUS Expr Expr TIMES Expr LPAREN Expr RPAREN { $1 } { Prog (List.rev $1) } { { { { { { Val $1 } Int $1 } Plus ($1, $3) } Minus ($1, $3) } Times ($1, $3) } $2 }

Here is some general information about tables, regardless of their type: A table can have up to 1,000 columns, although I recommend against a design that does contain the maximum number of columns, unless there is some pressing need. Tables are most efficient with far fewer than 1,000 columns. Oracle will internally store a row with more than 254 columns in separate row pieces that point to each other and must be reassembled to produce the entire row image. A table can have a virtually unlimited number of rows, although you will hit other limits that prevent this from happening. For example, typically a tablespace can have at most 1,022 files (although there are BIGFILE tablespaces in Oracle 10g that will get you beyond these file size limits, too). Say you have a typical tablespace and are using files that are 32GB in size that is to say, 32,704GB (1,022 files time