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Performance and Tuning Basics
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Performance is the measure of system response time to user requests, either interactively or in batch configuration. Performance problems in R/3 systems can greatly impede the overall acceptance of the systems as well as cause serious financial damage to companies. Therefore this issue must be seriously considered and planned for. Performance and tuning are closely linked to system monitoring and administration. Performance is affected by the following factors: System sizing and hardware resources Disk input/output throughput Network infrastructure Number of concurrent users and workload transaction profile Background processing Online reporting Printing strategy Local developed programs and transactions Size and fragmentation of database Service distribution 622
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Workload Analysis Configuration of technical infrastructure Buffer resets by transports Other connected services and applications Tuning is the process of optimizing performance, and consists of setting and configuring the hardware and software components with the goal of having better system response times. In other words, it is the technique by which systems can perform the same processes in less time. In order to achieve optimization of available resources, system managers and technical consultants have to closely monitor system workload profiles and statistics and take corrective actions. These actions can be performed on: Scalability, by configuring additional hardware resources if CPU or memory bottlenecks are detected Operating system parameters and configuration: memory management, disk input/output, swapping, and so on Database parameters and design SAP parameters: buffers, processes, instance profile parameters R/3 service distribution: batch, printing, operation modes Optimization of programs and reporting Optimization of database accesses Archiving Activities for a continuous improvement of performance take place in the going live productive support phases. This is usually done via the process of workload analysis and tuning. Often the most time consuming transactions are those that have been locally developed. End users may dislike going through large numbers of R/3 screens in order to perform a single transaction, and so request the consulting company to make a new transaction chaining required fields into a single screens. This is a dangerous process, since what used to be several dialog steps, processed at the clerical level (usually measured as a 30 second think time between two dialog steps), are now processed in a row by the system. This can affect performance, especially on those operations where the business process includes dozens of line items. Frequent transports into productive systems have a negative effect on performance, since, for example, when programs are changed and transported, they must be reloaded into the instance buffers, causing buffer fragmentation that might provoke buffer swaps and that decreases the buffer quality.
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Workload Analysis
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Workload analysis is part of the performance monitors. The goal of the information provided is to optimize the system's performance by finding what causes problems and bottlenecks, and which programs or transactions have a longer average response time or consume more system resources. The analysis of the performance data of the R/3 system and the performance monitor are the base tools for finding problems and bottlenecks in the system, and can be used for taking optimization actions. Workload analysis is based on several monitors: Performance database of the main workload monitor (transaction ST03), which displays very important information about the performance status of the systems. Work process overview, which can be used for displaying information about the status of current processes and finding stopped processes or long running transactions. 623
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Introduction to Helpdesk Operating system monitor, which can be used to display important information about operating system activity such as CPU utilization, memory, swap or disk utilization, or top CPU processes. The monitor collects both snapshot and statistical information. Database monitor, which shows the status of the database and main indicators of the quality of SQL access, data cache, dictionary cache, and so on. It also displays information about the status and fragmentation of the data files. Buffer monitor, which provides very useful information for displaying the quality of the instance parameters for the different SAP buffers and the utilization of the main memory. Bottlenecks in buffer usage are usually indicated by an excessive number of swaps. When analyzing performance problems, it must be first described whether the full system and every user is affected by a given problem, if it always occurs and if it is reproducible, or whether it only happens sometimes. There are many solutions and approaches for improving performance and tuning the system: Contracting preventive maintenance services like EarlyWatch. Proactively performing monitoring and systems management, and performing a daily and periodic checklist that should be documented. Analyzing the statistics and load profiles using the workload monitor. Checking the quality of development by debugging and optimizing local programs and transactions. SAP tools such as debugger, SQL Trace, and Runtime Analysis can be of help in this process. Performing extensive system and stress tests. Distributing the load among available instances and servers. Using offline reporting tools. Archiving and deleting obsolete data from the database. Applying patches and corrections to standard programs. Workload analysis options are introduced and discussed in Chap. 11.
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