.net pdf library extract text

.net pdf library extract text

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The best way to process XML documents in Oracle XML DB is to first load them into a special repository called the Oracle XML DB repository. The XML repository is hierarchical, like most XML data, and it enables you to easily query XML data. The paths and URLs in the repository represent the relationships among the XML data, and a special hierarchical index is used to traverse the folders and paths within the repository. The XML repository can hold non-XML data such as JPEG images, Word documents, and more. You can use SQL and PL/SQL to access the XML repository. XML authoring tools can directly access the documents in the XML repository using popular Internet protocols such as HTTP, FTP, and WebDAV. For example, you can use Windows Explorer, Microsoft Office, and Adobe Acrobat to work with the XML documents that are stored in the XML repository. XML is by nature documentcentric, and the XML repository provides applications with a file abstraction when dealing with XML data.

After the job completes, you can have another script run that changes the memory allocation back to the original settings The next few sections discuss the various components of the SGA You can manage the SGA yourself, by calibrating the memory you make available to the Oracle instance with the changing memory requirements of the running instance However, the best way to manage the SGA is simply by using automatic shared memory management, which I introduce in the Automatic Shared Memory Management section, later in this chapter..

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Before you can start using Oracle XML DB to manage XML documents, you need to perform the following tasks: 1. Create an XML schema. For example, SalesOrder, shown in Listing A-7, is a simple XML schema that reflects a simple XML document. Within the SalesOrder schema are elements such as ItemDescription, which provides details about the attributes of the component items. 2. Register the XML schema. After the XML schema is created, you must register it with the Oracle database using a PL/SQL procedure. When you register the XML schema, Oracle will create the SQL objects and the XMLType tables that are necessary to store and manage the XML documents. For the example shown in Listing A-6, registering the XML schema will create a table called SalesOrder automatically, with one row in the table for each SalesOrder document loaded into the XML repository. The XML schema is registered under the URL http:// localhost:8080/home/SCOTT/xdb/salesorder.xsd, and it contains the definition of the SalesOrder element.

The database buffer cache consists of the memory buffers that Oracle uses to hold the data read by the server process from data files on disk in response to user requests. Buffer cache access is, of course, much faster than reading the data from disk storage. When the users modify data, those changes are made in the database buffer cache as well. The buffer cache thus contains both the original blocks read from disk and the changed blocks that have to be written back to disk. You can group the memory buffers in the database buffer cache into three components: Free buffers: These are buffers that do not contain any useful data, and, thus, the database can reuse them to hold new data it reads from disk. Dirty buffers: These contain data that was read from disk and then modified, but hasn t yet been written to the data files on disk. Pinned buffers: These are data buffers that are currently in active use by user sessions.

Even if a developer doesn t know much XML, he or she can use the XML documents stored in the Oracle database by creating relational views based on the XML documents. The following example maps nodes in an XML document to columns in a relational view called salesorder_view: SQL> 2 3 4 5 6* CREATE OR REPLACE VIEW salesorder_view (requestor,description,sales_location) AS SELECT extractValue(s.sales_order,'/SalesOrder/Requestor'), extractValue(s.sales_order,'/SalesOrder/Sales_Location') FROM sales_Catalog_Table s ;

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