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In general, the PCTFREE parameter tells Oracle how much space should be reserved on a block for future updates. By default, this is 10 percent. If there is a higher percentage of free space than the value specified in PCTFREE, then the block is considered to be free. PCTUSED tells Oracle the percentage of free space that needs to be present on a block that is not currently free in order for it to become free again. The default value is 40 percent. As noted earlier, when used with a table (but not an IOT, as we ll see), PCTFREE tells Oracle how much space should be reserved on a block for future updates. This means if we use an 8KB block size, as soon as the addition of a new row onto a block causes the free space on the block to drop below about 800 bytes, Oracle will use another block from the FREELIST instead of the existing block. This 10 percent of the data space on the block is set aside for updates to the rows on that block.

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You can generate the parsers and lexers by calling fslex and fsyacc: fslex kittyLexer.fsl fsyacc kittyParser.fsy This produces kittyLexer.fs and kittyParser.fs, which contain the implementations of the parser and lexer. You can test these using F# Interactive by loading the files directly using the #load directive. The following code creates a LexBuffer called lexbuf. It then calls the KittyParser.start entry point for the parser, passing KittyLexer.token as the lexical analysis engine and lexbuf as the LexBuffer. This connects the parser and the lexer. open KittyAst open KittyParser open KittyLexer let parseText text = let lexbuf = Lexing.from_string text try KittyParser.start KittyLexer.token lexbuf with e -> let pos = lexbuf.EndPos failwithf "Error near line %d, character %d\n" pos.Line pos.Column You can now test this function interactively: > let sample = "counter := 100; accum := 0; \n\ while counter do \n\ begin \n\ counter := counter - 1; \n\ accum := accum + counter \n\ end; \n\ print accum";; val sample : string > parseText sample;; val it : KittyAst.prog = Prog

Note PCTFREE and PCTUSED are implemented differently for different table types. Some table types employ

both, whereas others only use PCTFREE, and even then only when the object is created. IOTs use PCTFREE upon creation to set aside space in the table for future updates, but do not use PCTFREE to decide when to stop inserting rows into a given block, for example.

[Assign ("counter",Int 100); Assign ("accum",Int 0); While (Val "counter", Seq [Assign ("counter",Minus (Val "counter",Int 1)); Assign ("accum",Plus (Val "accum",Val "counter"))]); Print Val "accum"] Writing an evaluator for Kitty is straightforward Here we utilize an environment that maps variable names to the integer values they store As you expect, assignments in the source language add a binding for a given variable, and evaluating variables reads a value from this environment Because of the lack of other types in Kitty, we use a nonzero value for the Boolean true and zero for false and wire the logic of the conditional and looping construct accordingly: let rec evalE (env: Map<string, int>) = function | Val v -> if envContainsKey v then env.

The exact effect of these two parameters varies depending on whether you are using ASSM or MSSM tablespaces. When you are using MSSM, these parameter settings control when the block will be put on and taken off the FREELIST. If you are using the default values for PCTFREE (10) and PCTUSED (40), then a block will remain on the FREELIST until it is 90 percent full (10 percent free space). Once it hits 90 percent, it will be taken off the FREELIST and remain off the FREELIST until the free space on the block exceeds 60 percent of the block. When you are using ASSM, PCTFREE still limits if a new row may be inserted into a block, but it does not control whether a block is on a FREELIST or not, as ASSM does not use FREELISTs at all. In ASSM, PCTUSED is simply ignored. There are three settings for PCTFREE: too high, too low, and just about right. If you set PCTFREE for blocks too high, you will waste space. If you set PCTFREE to 50 percent and you never update the data, you have just wasted 50 percent of every block. On another table, however, 50 percent may be very reasonable. If the rows start out small and tend to double in size, setting PCTFREE too small will cause row migration as you update the rows.

[v] else failwith ("unbound variable: " + v) | Int i -> i | Plus (e1, e2) -> evalE env e1 + evalE env e2 | Minus (e1, e2) -> evalE env e1 - evalE env e2 | Times (e1, e2) -> evalE env e1 * evalE env e2 and eval (env: Map<string, int>) = function | Assign (v, e) -> envAdd(v, evalE env e) | While (e, body) -> let rec loop env e body = if evalE env e <> 0 then loop (eval env body) e body else env loop env e body | Seq stmts -> List.