ssrs barcode font not printing Setting and Switching the Archive Log Mode in Software

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Setting and Switching the Archive Log Mode
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Archiving log mode must be normally started for SAP R/3 installations under the Oracle database. In order to start it automatically, enter the needed parameters in the init<sid>.ora file as stated in the previous section "Archived Redo Log Files." 530
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Tablespace Administration with sapdba There are situations in which you might consider it convenient for performance reasons to temporarily disable the archive log mode and enable it back again. For example, you can disable it for performing certain lengthy reorganizations or full database imports. In any case, make sure you always have a consistent backup of the situation before you disable the archive log mode. There are several ways to switch the archive log mode: Manually, using the surmgrl tool by issuing the ALTER DATABASE ARCHIVELOG or ALTER DATABASE NOARCHIVELOG commands. Within sapdba, from the initial menu, select option f Archive mode. The system will display the archive mode menu, as shown in Fig. 15 9.
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Figure 15 9: Switching ARCHIVE log mode from sapdba. In any case, to change the archive mode, the SAP R/3 instance must be stopped and the database must not be opened. When trying to change the archive log mode while the database is open, the system will request to shut it down to be able to achieve the operation. If SAP is up and running, you won't be able to change the archive mode either.
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The sapdba function c Tablespace administration is used for performing usual database administration tasks such as checking the free space or space problems in the tablespaces, extending the available tablespace storage, and creating new tablespaces. The next sections explain in detail all the available options. Figure 15 10 shows the Tablespace administration menu.
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Checking the Free Space and Fragmentation of Tablespaces
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Figure 15 10: Initial menu for tablespace administration. Please note that SAP recommends that if any structure change is performed in the database while managing tablespaces, as in when adding new data files, you should always perform a backup to avoid problems recovering a database with structural changes. In fact, after such changes, the system will automatically display the backup menu to allow you to start the backup right away. If you are going to perform several modifications in an administration session, you can wait to finish with all your changes and then perform either a backup of all the modified tablespaces or a full backup of the whole database. Whether you choose to perform the backup immediately or not, sapdba will make a copy of the old and new control files and leave them in the reorganization directory /oracle/ <SID>/sapreorg/<timestamp>. These files are saved with the names cntrl<SAPSID>.old and cntrl<SAPSID>.new. You can manage tablespaces using the Oracle server manager (svrmgrl) tool. However, sapdba presents the advantage that it automatically follows SAP naming conventions and will automatically check possible constraints (available storage, for example) as well as supply recommended values for file system destinations, sizes, and other parameters. The sapdba will notify you of errors before performing an operation with tablespaces. The tablespace administration menu offers options for managing individual tablespaces as well as performing global checks to all the database tablespaces. When working with individual tablespaces, you must first enter the tablespace name using option a. Otherwise, leave this option blank. The menu option b Log checks can be set to yes to store the checks performed in a log file (<timestamp>.ext) under the work directory (sapreorg). The next sections describe all other tablespace administration options.
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Checking the Free Space and Fragmentation of Tablespaces
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Under the Tablespace administration menu, you will find several options for checking the available free space. These options should be regularly checked (at least once a day) to prevent one of the most typical problems in R/3 system operation: failure due to insufficient contiguous space. When looking at this information, you can quickly decide to extend one or more tablespaces to avoid those problems. Using option c Freespace and fragmentation of all tablespaces will display an overview of all current allocated space and the free space remaining together with other useful information. An example is presented in Fig. 15 11. The screen presents the following information: Tablespace. Indicates the tablespace name. 532
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Checking the Free Space and Fragmentation of Tablespaces Total. Total tablespace storage space indicated in kilobytes. Allocated. Indicates in kilobytes the space that is already allocated (occupied) by database segments (data, indexes). % Alloc. The percentage of allocated space in relation with the total space. This is probably the main data to look at. If you find that this figure is over 85 or 90 percent, you might consider reorganizing or, better, extending the tablespace by adding new data files. Reorganization is explained later in this book. Files. Number of data files conforming the tablespace. Free areas. Number of areas that can be further allocated by the tablespace when the segments need to be extended. A high number probably means that the tablespace is highly fragmented. Largest. Size in kilobytes of the largest free area within the tablespace. This information is important when, for instance, the tablespace contains tables or indexes with a new extent size larger than the largest area available in the tablespace. In that case, even if there is free space, the creation of the new extent would fail. Cases like this indicate fragmentation problems.
Figure 15 11: Example of a list for free space and fragmentation of tablespaces. This information will enable database administrators to decide whether a reorganization might be needed, although, as you will see in following sections, it's better, easier, and faster to extend a tablespace before reorganizing it. Using the tablespace administration options d Check free space for objects in all tablespaces and e Check free space for objects in tablespace, administrators can check whether any tablespaces can overflow if additional extents are allocated to them. With option d, you check all tablespaces, while with option e, you must specify the tablespace to check. When selecting these options, the system will display a prompt requesting the number of extents to be checked. As a result, the system will display a list of tables or indexes that would overflow if the database would allocate the number of extents specified. By default, it usually checks for the creation of one additional extent. If the system finds no overflow problems in case of extent allocation, it will also be reported. Figure 15 12 shows an example of checking the PSAPDOCUD tablespace for the allocation of two additional extents. In this example, the system displays no problems.
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