crystal reports barcode font formula PERFOR MAN CE TUNING: TUNING THE INSTA NCE in Font

Printer ANSI/AIM Code 39 in Font PERFOR MAN CE TUNING: TUNING THE INSTA NCE

CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
Encoding Code 3 Of 9 In None
Using Barcode maker for Font Control to generate, create Code 39 image in Font applications.
www.OnBarcode.com
Generating PDF417 In None
Using Barcode generator for Font Control to generate, create PDF 417 image in Font applications.
www.OnBarcode.com
automatic performance features that are already a part of your database. Here s a brief summary of the automatic performance tuning features: The AWR collects all the performance data necessary for tuning as well as diagnosing instance problems. The ADDM automatically diagnoses database performance by analyzing the AWR data. The Automatic SQL Tuning Advisor provides SQL tuning recommendations. The database automatically runs the statistics collection job, thus keeping all statistics up to date. The Segment Advisor runs automatically during the maintenance interval and makes recommendations about which segments to shrink and which to reorganize (for example, due to excessive row chaining). The SQL Access Advisor provides recommendations about the ideal indexes and materialized views to create. The Memory Advisor, MTTR Advisor, and Undo Advisor help you tune memory, redo logs, and undo segments, respectively. In this chapter, I present the major dynamic performance views that you can use to diagnose instance performance. Traditionally, Oracle DBAs relied heavily on scripts using these views to monitor and tune instance performance. However, the best way to diagnose and tune Oracle performance issues is through the OEM Database Control (or Grid Control). I thus show you a simple approach to tuning using the OEM Database Control.
ECC200 Creator In None
Using Barcode generation for Font Control to generate, create ECC200 image in Font applications.
www.OnBarcode.com
Drawing Code 3 Of 9 In None
Using Barcode creation for Font Control to generate, create USS Code 39 image in Font applications.
www.OnBarcode.com
Note
Barcode Drawer In None
Using Barcode encoder for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Making Barcode In None
Using Barcode printer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
The AWR and ADDM are Oracle products that need special licensing through the purchase of the Diagnostic Pack. If you haven t purchased this licensing, you aren t supposed to use these features.
Create ANSI/AIM Code 128 In None
Using Barcode maker for Font Control to generate, create Code 128A image in Font applications.
www.OnBarcode.com
Encode USD8 In None
Using Barcode generator for Font Control to generate, create USD - 8 image in Font applications.
www.OnBarcode.com
Tuning Oracle Memory
Decode USS Code 39 In VS .NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Code 39 Extended Printer In Objective-C
Using Barcode printer for iPhone Control to generate, create Code 39 image in iPhone applications.
www.OnBarcode.com
A well-known fact of system performance is that fetching data that s stored in memory is a lot faster than retrieving data from disk storage. Given this, Oracle tries to keep as much of the recently accessed data as possible in its SGA. In addition to data, shared parsed SQL code and necessary data dictionary information are cached in memory for quick access. You can easily adjust the memory allocation of Oracle, by simply changing a single initialization parameter MEMORY_TARGET. There s a two-way relationship between memory configuration and the application s use of that memory. The correct memory allocation size depends on the nature of your application, the number of users, and the size of transactions. If there isn t enough memory, the application will have to perform time-consuming disk I/Os. However, the application itself might be using memory unnecessarily, and throwing more memory at it may not be the right strategy. As a DBA, you must not view memory and its sizing in isolation. This can lead to some poor choices, as you address the symptoms instead of the causes for what seems like insufficient memory. The tendency on a DBA s part is to allocate as much memory as possible to the shared pool, hoping that doing so will resolve the problem. However, sometimes this only exacerbates the problem. It s wise to manage the database with as little memory as necessary, and no more. The system can always use the free memory to ensure there s no swapping or paging. Performance slowdowns caused by paging outweigh the benefits of a larger SGA under most operating systems.
QR Code Decoder In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Data Matrix Creation In None
Using Barcode printer for Office Excel Control to generate, create Data Matrix image in Office Excel applications.
www.OnBarcode.com
CH A PT ER 2 0 PERF O RMAN CE TUNI NG: TUN ING TH E I NS TA NCE
Making GTIN - 13 In None
Using Barcode creator for Office Excel Control to generate, create GTIN - 13 image in Microsoft Excel applications.
www.OnBarcode.com
USS Code 39 Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Tuning the Shared Pool
UPC-A Supplement 2 Scanner In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Barcode Generator In Java
Using Barcode creation for BIRT reports Control to generate, create Barcode image in Eclipse BIRT applications.
www.OnBarcode.com
In a production database, the shared pool is going to command most of your attention because of its direct bearing on application performance. The shared pool is a part of the SGA that holds almost all the necessary elements for execution of the SQL statements and PL/SQL programs. In addition to caching program code, the shared pool caches the data dictionary information that Oracle needs to refer to often during the course of program execution. Proper shared pool configuration leads to dramatic improvements in performance. An improperly tuned shared pool leads to problems such as the following: Increased latch contention with the resulting demand for more CPU resources Greater I/O because executable forms of SQL aren t present in the shared pool Higher CPU usage because of unnecessary parsing of SQL code The general increase in shared pool waits and other waits observed during a severe slowdown of the production database is the result of SQL code that fails to use bind variables (I explain the important concept of bind variables in the following section). As the number of users increases, so does the demand on shared pool memory and latches, which are internal locks for memory areas. If there are excessive latches, the result might be a higher wait time and a slower response time. Sometimes the entire database seems to hang. The shared pool consists of two major areas: the library cache and the data dictionary cache. You can t allocate or decrease memory specifically for one of these components. If you increase the total shared pool memory size, both components will increase in some ratio that Oracle determines. Similarly, when you decrease the total shared pool memory, both components will decrease in size. Let s look at these two important components of the shared pool in detail.
Drawing GS1 128 In VB.NET
Using Barcode generator for .NET Control to generate, create GS1-128 image in VS .NET applications.
www.OnBarcode.com
Recognize Code 3 Of 9 In .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Create EAN / UCC - 13 In VS .NET
Using Barcode maker for .NET Control to generate, create EAN 13 image in .NET applications.
www.OnBarcode.com
Decode Data Matrix ECC200 In Visual Studio .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.