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Dataguard systems have one primary database against which transactions are executed, and one or more standby databases used for fault tolerance or for query processing The standbys are instantiated from a backup of the primary, and updated (possibly in real time) with all changes applied to the primary Standbys come in two forms A physical standby is byte-for-byte identical with the primary, for the purpose of zero data loss Even if the primary is totally destroyed, all data will be available on the standby The change vectors applied to the primary are propagated to the physical standby in the form of redo records, and applied as though a restored backup database were being recovered A logical standby contains the same data as the primary, but with possibly different data structures, typically to facilitate query processing The primary database may have data structures (typically indexes) optimized for transaction processing, while the logical standby may have structures optimized for data warehouse type work Change vectors that keep the logical standby in synch with the primary are propagated in the form of SQL statements, using the Streams mechanism Exercise 1-2: Determine if the Database Is Single Instance or Part of a Distributed System In this exercise, you will run queries to determine whether the database is a self-contained system, or if it is part of a larger distributed environment Either SQL Developer or SQL*Plus may be used If you do not have access to an Oracle database yet to practice this exercise, you can skip to 2, complete an installation, and return to this exercise 1 Connect to the database as user SYSTEM 2 Determine if the instance is part of a RAC database:

Description: ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< $description ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< $description ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< $description ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< $description

open(DATA,"<datafiledb") or die "Can't open database";

select parallel from v$instance;

16:

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In the C language, two null pointers are equal, as pointer comparison is simply a comparison of two integral values. C# follows this pattern, and for equality operations, two null values are defined as being equal, a behavior that s in contrast to SQL logic where null isn t equal to null but instead is null. During the C# 2.0 design process, the designers discussed this decision at length and considered many options. One option was to support both the programming and database versions of equality (null == null and null != null), but this would have required an additional set of operators. The C# design team ultimately decided that approach would add too much complexity. They decided using the database version of equality in code would be surprising to the majority of C# programmers. The following code highlights the different behavior between the two languages: //C# int i = int j = bool b = //b with null; null; i == j; be true

This will return NO if it is a single-instance database 3 Determine if the database is protected against data loss by a standby database:

while(<DATA>) { chomp; ($prodid, $type, $cost, $instock, $description) = split /:/; write; } close(DATA);

select protection_level from v$database;

This does the absolute minimum to produce a report from the information supplied in an external file For each input line from the file, the data is extracted and the write function is called This tells the reporting mechanism to build the line according to the specified format, and then to output it In this case, the output is STDOUT, but it could have been any open filehandle, providing you named the format accordingly

If you want to print a header for each page of output, you can create a format with the same name as the main format, with _TOP attached The information contained in this format will be printed at the top of every page (see the Format Variables section that follows) This can be helpful both for printing column headers and for printing titles and page numbers For example, the two formats for printing a columnar version of the previous report might look like this:

This will return UNPROTECTED if the database is indeed unprotected 4 Determine if Streams has been configured in the database:

format STDOUT_TOP = Product Type Cost Stock Description ------------ -------- ----- ------------------------------------ format STDOUT = @<<<<<<<< @|||||| @###### @>>>> ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< $prodid, $type, $cost, $instock,$description ^<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<~~ DEVELOPING APPLICATIONS

select * from dba_streams_administrator;

Footers are more difficult, because there is no built-in device for printing a footer on each page The best method is to check the value of $- ($FORMAT_LINES_LEFT when the English module is used) and then print out the new footer before calling write Note, however, that you will need to update the value of $- to account for the number of lines you have added to the current page Setting $- to 0 triggers the generation of a new page

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