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The SGA is the most important memory component in an Oracle instance. In large OLTP databases, especially, the SGA is a much larger and more important memory area than the PGA. In data warehousing environments, on the other hand, the PGA can be the more important Oracle memory area, because it critically influences the efficiency of large data sorts and hashes, which are commonly part of analytic computations in data warehouses. The SGA s purpose is to speed up query performance and to enable a high amount of concurrent database activity. Because processing in memory is much faster than disk I/O, the size of the SGA is one of the more important configuration issues when you re tuning the database for optimal performance. When you start an instance in Oracle, the instance takes a certain amount of memory

To optimize and execute statements that involve XML data, Oracle uses a query-rewrite mechanism to transform an XPath expression into an equivalent regular SQL statement The optimizer then processes the transformed SQL statement like any other SQL statement..

Table 5-3. Linux/Unix NTP-Related Programs and Utilities Program Name ntpd/xntpd Program Description

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from the operating system s RAM the amount is based on the size of the SGA component in the initialization file When the instance is shut down, the memory used by the SGA goes back to the host system The SGA isn t a homogeneous entity; rather, it s a combination of several memory structures The following are the main components of the SGA: Database buffer cache: Holds copies of data blocks read from data files Shared pool: Contains the library cache for storing SQL and PL/SQL parsed code in order to share it among users It also contains the data dictionary cache, which holds key data dictionary information Redo log buffer: Contains the information necessary to reconstruct changes made to the database by DML operations This information is then recorded in the redo logs by the log writer Java pool: Keeps the state of Java program execution.

You can store XML in Oracle XML DB in the following ways: You can use SQL or PL/SQL to insert the data. Using XMLType constructors, you must first convert the sourced data into an XMLType instance. You can use the Oracle XML DB repository to store the XML data. Here s a simple example using the sales_catalog_table table to demonstrate how to perform SQL-based DML operations with an XML-enabled table. In Listing A-7, an XML document is inserted into sales_catalog_table. Listing A-7. Inserting an XML Document into an Oracle Table SQL> INSERT INTO sales_catalog_table 2 VALUES (123456, 3 XMLTYPE( 4 '<SalesOrder> 5 <Reference>Alapati - 200302201428CDT</Reference> 6 <Actions/> 7 <Reject/> 8 <Requestor>Nina U. Alapati</Requestor> 9 <User>ALAPATI</User> 10 <SalesLocation>Dallas</SalesLocation> 11 <ShippingInstructions/> 12 <DeliveryInstructions>Bicycle Courier</DeliveryInstructions> 13 <ItemDescriptions> 14 <ItemDescription ItemNumber="1"> 15 <Description>Expert Oracle DB Administration</Description> 16 <ISBN Number="1590590228"Price="59.95"Quantity="5"/> 17 </ItemDescription> 18 </ItemDescriptions> 19* </SalesOrder>')); 1 row created. SQL> You can query the sales_catalog_table table s sales_order column, as shown in Listing A-8, to view the XML document in its original format. Listing A-8. Viewing XML Data Stored in an Oracle Table SQL> SELECT sales_order FROM 2 sales_catalog_table; <SalesOrder> <Reference>Alapati - 200302201428CDT</Reference> <Actions/> <Reject/> <Requestor>Sam R. Alapati</Requestor> <User>ALAPATI</User> <SalesLocation>Dallas</SalesLocation> <ShippingInstructions/> <DeliveryInstructions>Bicycle Courier</DeliveryInstructions> <ItemDescriptions> <ItemDescription ItemNumber="1"> <Description>Expert Oracle DB Administration</Description> <ISBN Number="9999990228" Price="59.95" Quantity="2"/> </ItemDescription>

Large pool: Stores large memory allocations, such as RMAN backup buffers Streams pool: Supports the Oracle Streams feature When you start the Oracle instance, Oracle allocates memory as needed until it reaches the size set in the SGA_TARGET initialization parameter, which sets the limit for the total memory allocation If your total memory allocation is already at the SGA_TARGET limit, you can t dynamically increase memory to any SGA component without decreasing some other component s memory allocation Oracle does allow you to exchange the memory from one dynamically sizable memory component to another For example, you can increase the memory assigned to the buffer cache by taking it from the shared pool If you have certain jobs run only at specified times of the day, you can write a simple script that runs before the job executes and modifies the allocation of memory among the various components.

</ItemDescriptions> </SalesOrder> SQL> Once you create the sales_catalog_table table, it s very easy to retrieve data using one of the methods I just described. The following example shows how to query the table using the extract() method. Note that the query includes XPath expressions and the SQL/XML operators extractValue and existsNode to find the requestor s name where the value of the /SalesOrder/SalesLocation/ text() node contains the value Dallas. SQL> SELECT extractValue(s.sales_order,'/SalesOrder/Requestor') 2 FROM sales_catalog_table s 3 WHERE existsNode(s.SALES_ORDER, 4* '/SalesOrder[SalesLocation="Dallas"]') = 1; EXTRACTVALUE(S.SALES_ORDER,'/SALESORDER/REQUESTOR') --------------------------------------------------Nina U. Alapati SQL>

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