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You can simply produce an ASH report, which contains both the current active session data from the V$ACTIVE_SESSION_HISTORY view as well as the historical active session data stored in the DBA_HIST_ACTIVE_SESS_HISTORY view The ASH report shows you the SQL identifier of SQL statements, object information, session information, and relevant wait event information You can produce an ASH report by simply going to the OEM Database Control, or by running an Oracle-provided script In fact, Oracle provides you with two ASH-related scripts, as follows: The ashrptsql script produces an ASH report for a specified duration for the default database The ashrptisql script produces the same report as the ashrptsql script, but lets you specify a database instance Actually, the ashrptsql script defaults the dbid and instance number to those of the current instance, and simply runs the ashrptisql script.

Both of the preceding described scripts are available in the $ORACLE_HOME/rdbms/admin directory Here s how you get an ASH report for your instance: SQL> @ORACLE_HOME/rdbms/admin/ashrptsql You can then look at the ASH report, which is placed in the directory from which you ran the ashrptsql script 18 explains a typical ASH report, in the section titled Producing the ashrptsql Script..

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In Oracle9i, the various SGA components must be manually sized by the DBA but, starting in Oracle 10g, there is a new option to consider: automatic SGA memory management, whereby the database instance will allocate and reallocate the various SGA components at runtime, in response to workload conditions When using the automatic memory management with Oracle 10g, it is a matter of simply setting the SGA_TARGET parameter to the desired SGA size, leaving out the other SGA-related parameters altogether The database instance will take it from there, allocating memory to the various pools as needed and even taking memory away from one pool to give to another over time Regardless of whether you are using automatic or manual memory management, you will find that memory is allocated to the various pools in units called granules A single granule is an area of memory either 4MB, 8MB, or 16MB in size.

Since VB .NET supports the same types as C#, the naming conventions for Fire methods, delegates, and events are similar, but there are enough differences to justify a separate discussion of VB .NET. When dealing with universal events in other words, those whose handlers take no arguments and

So far in this chapter, you ve looked at ways to improve performance how to make the database go faster. Sometimes, however, your problem is something much more serious: the database seems to have stopped all of a sudden! The following sections describe the most important reasons for a hanging or an extremely slow-performing database, and how you can fix the problem ASAP. One of the first things I do when the database seems to freeze is check and make sure that the archiver process is doing its job. The following sections describe the archiver process.

If your archive log destination is full and there isn t room for more redo logs to be archived, the archiver process is said to be stuck. The database doesn t merely slow down it freezes in its tracks. As you are aware, in an archive log mode the database simply won t overwrite redo log files until they re archived successfully. Thus, the database starts hanging when the archive log directory is full. It stays in that mode until you move some of the archive logs off that directory manually.

The granule is the smallest unit of allocation, so if you ask for a Java pool of 5MB and your granule size is 4MB, Oracle will actually allocate 8MB to the Java pool (8 being the smallest number greater than or equal to 5 that is a multiple of the granule size of 4) The size of a granule is determined by the size of your SGA (this sounds recursive to a degree, as the size of the SGA is dependent on the granule size) You can view the granule sizes used for each pool by querying V$SGA_DYNAMIC_COMPONENTS.

The archiver process is in charge of archiving the filled redo logs. It reads the control files to find out if there are any un archived redo logs that are full, and then it checks the redo log headers and blocks to make sure they re valid before archiving them. You may have archiving-related problems if you re in the archive log mode but the archiver process isn t running for some reason. In this case, you need to start the archiver process by using the following command: SQL> ALTER SYSTEM ARCHIVE LOG START; If the archiver process is running but the redo logs aren t being archived, then you may have a problem with the archive log destination, which may be full. This causes the archiver process to become stuck, as you ll learn in the next section.

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