Simple .NET/ASP.NET PDF document editor web control SDK

In this chapter, we covered lexing and parsing, which are tasks that can be tiresome if you don t use the right tools and techniques for the job. You learned about working with simple lineoriented formats, including on-demand reading of large data files, and then with the fslex and fsyacc tools, which are particularly suited for parsing programming languages and other languages with structured, rather than line-oriented, formats. Finally, we covered some combinator-based approaches for generating and reading binary data, which is also a form of parsing. In the next chapter, we ll switch to a different area of programming and look at how to write F# code that interoperates with native code.

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Now that you know how to see most of the options available to you on a given CREATE TABLE statement, which are the important ones you need to be aware of for heap tables In my opinion, there are three with ASSM and five with MSSM: FREELIST: MSSM only Every table manages the blocks it has allocated in the heap on a FREELIST A table may have more than one FREELIST If you anticipate heavy insertion into a table by many concurrent users, configuring more than one FREELIST can have a major positive impact on performance (at the cost of possible additional storage) Refer to the previous discussion and example in the section FREELISTS for the sort of impact this setting can have on performance PCTFREE: Both ASSM and MSSM A measure of how full a block can be is made during the INSERT process.

oftware integration and reuse is becoming one of the most relevant activities of software development nowadays. In this chapter, we discuss how F# programs can interoperate with the outside world, accessing code available in the form of DLLs and COM components.

As shown earlier, this is used to control whether a row may be added to a block or not based on how full the block currently is This option is also used to control row migrations caused by subsequent updates and needs to be set based on how you use the table PCTUSED: MSSM only A measure of how empty a block must become before it can be a candidate for insertion again A block that has less than PCTUSED space used is a candidate for insertion of new rows Again, like PCTFREE, you must consider how you will be using your table to set this option appropriately INITRANS: Both ASSM and MSSM The number of transaction slots initially allocated to a block If set too low (defaults to and has a minimum of 2), this option can cause concurrency issues in a block that is accessed by many users.

If a database block is nearly full and the transaction list cannot be dynamically expanded, sessions will queue up for this block, as each concurrent transaction needs a transaction slot If you believe you will have many concurrent updates to the same blocks, consider increasing this value COMPRESS/NOCOMPRESS: Both ASSM and MSSM Enables or disables compression of table data during either direct path operations or during conventional path ( normal, if you will) operations such as INSERT Prior to Oracle 9i Release 2, this option was not available Starting with Oracle 9i Release 2 through Oracle 10g Release 2, the option was COMPRESS or NOCOMPRESS, to either use or not use table compression during direct path operations only In those releases, only direct path operations such as CREATE TABLE AS SELECT, INSERT /*+ APPEND */, ALTER TABLE T MOVE, and SQL*Loader direct path loads could take advantage of compression.

Most types have empty values that are obvious, but DateTime is problematic as it has no empty value: Public Function GetDateTime(ByVal name As String) As Date Dim index As Integer = Me.GetOrdinal(name) Return Me.GetDateTime(index) End Function Public Overridable Function GetDateTime(ByVal i As Integer) As Date _ Implements System.Data.IDataReader.GetDateTime