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This chapter provides an outline of the important Oracle automatic management features, as well as the sophisticated built-in performance tuning features, including the new Automatic Workload Repository, the Automatic Database Diagnostic Monitor, and the advisor-based Management Framework Before you delve deeply into the logical and physical structures that make up an Oracle database, however, you need to be clear about a fundamental concept the difference between an Oracle instance and an Oracle database It is very common for people to use the terms interchangeably, but they refer to different things altogether An Oracle database consists of files, both data files and Oracle system files These files by themselves are useless unless you can interact with them somehow, and this requires the help of the operating system, which provides processing capabilities and resources, such as memory, to enable you to manipulate the data on the disk drives.

TCH FILE# DBABLK WHAT ---------- ---------- ---------- ---------------------------------------51099 1 1434 (TABLE) SYS.JOB$ 49780 1 1433 (TABLE) SYS.JOB$ 48526 1 1450 (INDEX) SYS.I_JOB_NEXT 11632 2 57 rbs/compat segment 10241 1 1442 (INDEX) SYS.I_JOB_JOB

When you combine the specific set of processes created by Oracle on the server with the memory allocated to it by the operating system, you get the Oracle instance You ll often hear people remarking that the database is up, though what they really mean is that the instance is up The database itself, in the form of the set of physical files it s composed of, is of no use if the instance is not up and running The instance performs all the necessary work for the database..

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Communication diagrams, formerly called Collaboration diagrams in UML 1.4, are an alternative way to visualize interactions between objects. Communication diagrams carry the same information as Sequence diagrams, but have a structure and layout similar to a UML Object diagram. Communication diagrams emphasize the connections between objects, so interactions are shown in terms of connection paths that exist in the system. In contrast, Sequence diagrams make no assumptions about how messages are routed from one object to another. Figure 6-13 shows a simple Communication diagram.

Collecting baseline data about your database statistics, including wait events, is critically important for troubleshooting performance issues. If you have baseline data, you can immediately check if the current resourceusage patterns are consistent with the load on the system.

Note (2^32 1) or 4,294,967,295 is a magic number used to denote special blocks. If you would like

It isn t rare for a single user s SQL query to cause an instance-wide deterioration in performance if the query is bad enough SQL statements are at the root of all database activity, so you should look at what s going on in the database right now.

Figure 6-13. A simple Communication diagram In the Sequence diagrams described in the previous section, the chronological order of messages is determined by the message position on the vertical lifelines. In Communication diagrams, there is no time axis, so messages are numbered. You can use a dotted notation to show nested procedure calls. For example, if an object calls two procedures as a result of message 1, then those calls could be labeled 1.1 and 1.2.

The following are some of the key questions to which you need to find answers: Who are the top users in your Top Sessions display What are the exact SQL statements being executed by these users Is the number of users unusually high compared to your baseline numbers for the same time period Is the load on the database higher than what your baseline figures show for the time of the day or the time of the week or month What top waits can you see in the V$SESSION or the V$SESSION_WAIT view These real-time views show the wait events that are happening right now or that have just happened in the instance You have already seen how you can find out the actual users responsible for the waits by using other V$ views.

to understand what the block is associated with, use the query select * from dba_extents where file_id = FILE# and block_id <= <DBABLK and block_id+blocks-1 >= DBABLK.

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