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Performing a Full Backup
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It should be mandatory to perform a full backup of the system right after finishing the installation, since nobody wants to waste two or three days' worth of effort to install the SAP system again. If this is the very first backup, it is a good practice to use the operating system backup utilities or other supported backup software to save the whole server files, including the operating system. Before performing a 81
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Remote Connection to SAP backup, stop the SAP system to leave it in a consistent state. After you perform this initial backup, you must define a backup strategy including the critical components of the SAP system, such as the database files and the redo logs. This is discussed in detail in Chap. 16.
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Remote Connection to SAP
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It is also mandatory to make a remote connection to SAP systems as soon as possible. In order to accomplish this, there are some procedures to follow including obtaining the physical connection, the official IP address, and installing and configuring the SAProuter program. Appendix A deals with these topics.
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Depending on the nature of the installation, some optional postinstallation steps may be performed. For example, if the users' language is not German or English, then the users' language may be imported into the system. The SAP kit comes with a language files CD to import the needed language into the system. To do this, refer to the official SAP manual R/3 Language Transport. Do not forget to look up or request OSS notes about possible hints or problems when transporting languages. Depending on the release, it might be necessary to install the R/3 support packages. The support packages are collections of corrections to R/3 programs and other repository objects. You will have to check the SAP notes to determine which package collections are required for your specific installation.
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The purpose of this section is to make the people in charge of technically implementing the system aware that installing the system is not the same thing as having it ready for productive day to day business work. There are certain aspects of the R/3 system that, from a technical and management point of view, must be carefully considered. Many of them apply to all installations, and others might not be necessary. All these points are discussed in more detail in different sections of this book. These points are as follows: A backup and recovery strategy for R/3. Well defined technical, functional, and development support lines for the users and developers of the system. This includes hardware and database vendors as well as SAP. Cleaning background jobs. Definition of daily or periodic tasks for the operation and support teams. Database administration. Printing strategy. System management procedures. Definition and setup of the CCMS operation modes and alerts. SAP R/3 monitoring (CCMS) and administration, including performance and tuning. Network monitoring and administration. Users and authorizations management. Preventive maintenance and EarlyWatch. External systems interfaces and batch input strategy. Upgrading the system: SAP, database, operating system. 82
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Considerations for Oracle VLDBs (Very Large Databases) Hardware maintenance policy. Connection to SAP support servers. Implementation quality control. Disaster recovery strategy.
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Considerations for Oracle VLDBs (Very Large Databases)
Follow the general considerations previously described in the section "Oracle File System Design Guidelines." As a brief reminder, remember that the redo logs have very high input/output activity and should be on different disks than the database data itself. Also, remember to place the data and index files for a tablespace on separate disks, which is standard in the R/3 installation. However, when considering large databases, where additional tablespaces might be necessary, you may need to do some mixing and matching to place the data and index on different file systems. The most intensive input/output tablespaces on the SAP system are PSAPSTABD, PSAPCLUD, and PSAPBTABD, as well as corresponding index tablespaces PSAPSTABI, PSAPCLUI, and PSAPBTABI. These tables contain most of the transactional data of users' daily work. At least try to place these three tablespaces on different disks. The SAPDATA<N> file systems should be used exclusively for the tablespace data and index. Do not mix them with operating system files, swap space, or SAP runtime programs. The SAPARCH file systems should also be located on a different disk. This file system should be sized properly to avoid the archiver stuck problem. This well known problem occurs if the saparch file system becomes full and the redo log files can't be archived. If this event happens to you, the SAP system becomes inactive, and the update process seems to be in a suspended state. The size of transaction log files (redo log files) can positively affect the performance. For instance, bigger sizes increase performance but, as a drawback, slow down database startup/shutdown procedures, especially in recover situations. Also, if you lose one redo log, more data is lost. SAP standard size is 20 MB, but you could change that value to 50 MB or even 100 MB. To do that, follow the instructions from the Oracle manuals or request specific instructions from a SAP expert on how to proceed. Warning Before performing any modification on the database, make sure you have a reliable backup and you know what you are doing.
Increase the capacity of the temporary tablespace, PSAPTEMP. This procedure should be done when first installing the system. When database size exceeds 50 GB, try to increase the size to at least 1 GB. For increasing the size of either the PSAPTEMP or SYSTEM tablespaces, look up the SAPnet notes, since these tablespaces have special instructions for these procedures. In the creation of additional rollback segments, the SAP rule is that each rollback segment be able to hold the data of about four work processes. If you plan to have more than 40 work processes or if you want to allow the system to share more rollback segments among the work processes, create additional rollback segments. If you do, do not forget to increase the size of the PSAPROLL tablespace. Another way to increase performance and possibly reduce the time needed for future reorganization is to use the table stripping procedure. Table stripping means to separate large tables from their actual table spaces and turn them into new tablespaces. 83
Considerations for Oracle VLDBs (Very Large Databases) The sapdba program includes utilities to perform this without the need to do it manually. Refer to Chap. 14 for more information. Finally, consider the EarlyWatch service or the Oracle hotline to help you when configuring the necessary Oracle database parameters according to your hardware installation (amount of memory, type and number of processors, version, etc.).
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