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In this section we introduce a cost model that allows us to estimate the cost (in terms of execution time) of di erent database operations We will use the following notation and assumptions in our analysis There are B data pages with R records per page The average time to read or write a disk page is D, and the average time to process a record (eg, to compare a eld value to a selection constant) is C In the hashed le organization, we will use a function, called a hash function, to map a record into a range of numbers; the time required to apply the hash function to a record is H Typical values today are D = 15 milliseconds, C and H = 100 nanoseconds; we therefore expect the cost of I/O to dominate This conclusion is supported by current hardware trends, in which CPU speeds are steadily rising, whereas disk speeds are not increasing at a similar pace On the other hand, as main memory sizes increase, a much larger fraction of the needed pages are likely to t in memory, leading to fewer I/O requests We therefore use the number of disk page I/Os as our cost metric in this book We emphasize that real systems must consider other aspects of cost, such as CPU costs (and transmission costs in a distributed database) However, our goal is primarily to present the underlying algorithms and to illustrate how costs can be estimated Therefore, for simplicity, we have chosen to concentrate on only the I/O component of cost Given the fact that I/O is often (even typically) the dominant component of the cost of database operations, considering I/O costs gives us a good rst approximation to the true costs Even with our decision to focus on I/O costs, an accurate model would be too complex for our purposes of conveying the essential ideas in a simple way We have therefore chosen to use a simplistic model in which we just count the number of pages that are read from or written to disk as a measure of I/O We have ignored the important issue of blocked access typically, disk systems allow us to read a block of contiguous pages in a single I/O request The cost is equal to the time required to seek the rst page in the block and to transfer all pages in the block Such blocked access can be much cheaper than issuing one I/O request per page in the block, especially if these requests do not follow consecutively: We would have an additional seek cost for each page in the block This discussion of the cost metric we have chosen must be kept in mind when we discuss the cost of various algorithms in this chapter and in later chapters We discuss the implications of the cost model whenever our simplifying assumptions are likely to a ect the conclusions drawn from our analysis in an important way. how to convert pdf to text file in vb.net VB . Net - Database Access - Tutorialspoint
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NET Framework. > Visual Basic ... I am trying to convert a HTML string to pdf using the ITextSharp .dll and ITextSharp . ... Private Sub test(ByVal html As String) Dim strHtml As String Dim memStream As New MemoryStream() ... You can also create new interfaces by combining existing interfaces and optionally adding new methods or properties. For example, you might decide to combine the definitions of IStorable and ICompressible into a new interface called IStorableCompressible. This interface would combine the methods of each of the other two interfaces, but would also add a new method, LogOriginalSize( ), to store the original size of the precompressed item: Sec 8-3 interface IStorableCompressible : IStorable, ILoggedCompressible { void LogOriginalSize( ); } java code 39 generator, pdf417 java open source, excel 2013 data matrix generator, rdlc data matrix, .net code 39 reader, vb.net code 128 reader visual basic fill pdf How to fill PDF form from database using C# and VB . NET - Syncfusion
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That info is in Introduction to SDK > Developer FAQ > Understanding the Acrobat SDK > PDF documents > Visual Basic . NET and Visual C# . Sometimes references may be to other tuples of the same relation: supervisor REFERENCE employee An explicit reference may be bound by a join to be performed when the CURRENT employee record is de ned for insertion into the database back up person REFERENCE employee HAVING skill = FIRST skill OF CURRENT employee The schema implemented by SOCRATE describes a concept from a user s view rather than the structure of relations or les We will discuss the subschema structure to support multiple user views in Sec 8-4 8-3-4 Derived Data Processing derives new data, using source data found in the database Processing implies having source data and an algorithm to process the data We have described knowledge about the data in the model and encode this knowledge in the schema which implements the model The schema makes the data description available to all users of the database If we have knowledge about processing which is useful to multiple users we should also store this information with the database schema Knowledge about processing algorithms is encoded in the programs used to derive data To make such algorithms available within the framework of a schema we associate programs with a new class of data elements: derived data The use of derived data de ned in the schema automatically invokes the processing programs and accesses the appropriate source data The e ort to derive data can be such that it becomes desirable to store derived intermediate or nal data also within the database, in addition to the algorithms or programs used to derive them While the programs are still attached to the databases schema, actual stored derived data will appear in the database itself If data are de ned as derived they will not be available for conventional update vb.net pdf sdk How to Convert PDF to Text in . NET ( VB ) | Square PDF . NET
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