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Under ASSM, the data is inserted in any of the blocks between the low high water mark and the high water mark, so many of the blocks in this area might not be formatted So, when full scanning a segment, we have to know if the blocks to be read are safe or unformatted (meaning they contain nothing of interest and we do not process them) To make it so that not every block in the table needs go through this safe/not safe check, Oracle maintains a low HWM and a HWM Oracle will full scan the table up to the HWM and for all of the blocks below the low HWM, it will just read and process.

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You ll see how to use this function a little later in this chapter. In a roundabout way the type says, If you give me a lexing function that generates tokens and give me a LexBuffer to supply to that lexing function, then I ll generate you a KittyAst.prog. The generic type variables indicate that the parser is independent of the kind of position marks or characters (ASCII or Unicode) manipulated by the LexBuffer. We now cover in more detail the different aspects of fsyacc parsing illustrated by this example.

them. For blocks between the low HWM and the HWM (see Figure 10-2), it must be more careful and refer to the ASSM bitmap information used to manage these blocks in order to see which of them it should read and which it should just ignore.

When you use an MSSM tablespace, the FREELIST is where Oracle keeps track of blocks under the HWM for objects that have free space on them.

The general structure of fsyacc input files is as follows: // Preamble any code you need for the parser, such as opening modules, etc. %{ [Code] %} // Tokens and their types each line may contain several tokens %token <[Type]> [TokenName] ... [TokenName] ... // Associativity and precedences where tokens associate (left, right, // nonassoc) and how strongly they bind (in the order of their declaration) %left [TokenName] %right [TokenName] %nonassoc [TokenName] ...

Each object will have at least one FREELIST associated with it, and as blocks are used, they will be placed on or taken off of the FREELIST as needed. It is important to note that only blocks under the HWM of an object will be found on the FREELIST. The blocks that remain above the HWM will be used only when the FREELISTs are empty, at which point Oracle advances the HWM and adds these blocks to the FREELIST. In this fashion, Oracle postpones increasing the HWM for an object until it has to. An object may have more than one FREELIST. If you anticipate heavy INSERT or UPDATE activity on an object by many concurrent users, then configuring more than one FREELIST can have a major positive impact on performance (at the cost of possible additional storage). Having sufficient FREELISTs for your needs is crucial. FREELISTs can be a huge positive performance influence (or inhibitor) in an environment with many concurrent inserts and updates. An extremely simple test can show the benefits of setting FREELISTS correctly. Consider this relatively simple table: ops$tkyte%ORA11GR2> create table t ( x int, y char(50) ) tablespace mssm; Table created.

// Start symbols and their types %start [StartSymbol] %type <[Type]> [StartSymbol] %% // Productions defining how non-terminals are derived [Symbol] : [Symbols_1] { [Code_1] } | [Symbols_2] { [Code_2] } ... The preamble can contain F# code, typically opening various modules and defining helper functions. The tokens (terminal symbols) of the grammar are defined with the %token directive, giving the name of the token(s) preceded by its type enclosed in <>. The type can be omitted if a token carries no data. There must be at least one start symbol defined using the %start and its type given with the %type directive. The resulting parser will expose only those parsing functions that were designated as start symbols. The productions for the same nonterminal can be merged into the same rule separated by an | character.

Note mssm in the above example is the name of a tablespace, not a keyword. You may replace it with the name