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In Oracle, a schema is defined as a collection of logical structures of data, or schema objects, although it is used mostly as a synonym for the database user (specifically, the application owner) that owns the schema pertaining to a specific application. Thus, the accounting schema within a company database would own all the tables and code pertaining to the accounting department. In addition to containing tables, a schema contains other database objects, such as PL/SQL procedures, functions and packages, views, sequences, synonyms, and clusters. This logical separation of the objects within the database allows you considerable flexibility in managing and securing your Oracle databases. Although the DBA can use the CREATE SCHEMA statement to populate a schema with database objects such as tables and views, more often the application owner creates the database objects and is referred to as the schema owner. The user who creates the objects owns database objects such as tables, views, procedures, functions, and triggers. The owner of the object has to explicitly assign specific rights to other users, such as SELECT or UPDATE, if those other users are to use the objects.



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3. Notice the setting on the left side of the graph that currently says No Ease. Let s change that.

Oracle Database 11g is an object-relational database and, as such, it allows users to define several types of data other than the standard relational data types. These user-defined data types include the following: Object types: These complex types are an abstraction of real-world entities. Array types: These types are used to create ordered sets of data elements of the same type. Table types: These types are used to create an unordered set of data elements of the same data type. XML schema: This is a new object type that is used to create types and storage elements for XML documents based on the XML schema. The Appendix provides examples of how to create various kinds of user-defined object types. In this chapter, the focus is on the traditional relational objects.





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Click the check box to enable easing, and from the drop-down list select Simple (Slow), which is your only choice. At this point, you ve applied an ease, and the check mark next to the dropdown means the ease is active. (You can select and deselect this check mark to toggle the ease on or off.)

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gets you all the necessary information). For example, if the undo-block buffer waits make up most of your buffer busy waits, then the undo segments are at fault, not the data blocks. Finally, use the V$SESSION view to find out the exact objects that may be the source of a problem. For example, if you have a high amount of db file scattered read type waits, the V$SESSION view will give you the file number and block number involved in the wait events. In the following example, the V$SESSION view is used to find out who is doing the full table scans showing up as the most important wait events right now. As explained earlier, the db file scattered read wait event is caused by full table scans. SQL> SELECT sid, sql_address, sql_hash_value FROM V$SESSION WHERE event = 'db file scattered read'; Here s an example that shows how to find out the current wait event for a given session: SQL> SELECT sid, state, event, wait_time, seconds_in_wait 2 FROM v$session 3*WHERE sid=1418; SID --1418 SQL> STATE -----WAITING EVENT ----------------------db file sequential read WAIT_TIME --------0 SECONDS_IN_WAIT --------------0

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The value of 0 under the WAIT_TIME column indicates that the wait event db file sequential read is occurring for this session. When the wait event is over, you ll see values for the WAIT_TIME and the SECONDS_IN_WAIT columns. You can also use the V$SQLAREA view to find out which SQL statements are responsible for high disk reads. If latch waits predominate, you should be looking at the V$LATCH view to gain more information about the type of latch that s responsible for the high latch wait time: SQL> 2 3 4* SID ---1218 1400 SQL> SELECT sid, blocking_session, username, event, seconds_in_wait siw FROM V$SESSION WHERE blocking_session_status = 'VALID'; BLOCKING_SESS ------------1527 1400 USERNAME -------UCR_USER APPOWNER EVENT ----------------------------enq: TX - row lock contention latch free SIW ----23 0

If that doesn t look like easing to you, you re right. Selecting Simple (Slow) isn t enough. You need to choose a percentage for that ease, which affects its strength. Think of it as a faucet applying the ease means you ve paid the water bill, but you won t see water until you turn on the faucet.

The V$SESSION_WAIT_HISTORY view holds information about the last ten wait events for each active session. The other wait-related views, such as the V$SESSION and the V$SESSION_WAIT, show you only the wait information for the most recent wait. This may be a short wait, thus escaping your scrutiny. Here s a sample query using the V$SESSION_WAIT_HISTORY view: SQL> 2 3 4* SELECT seq#, event, wait_time, p1, p2, p3 FROM V$SESSION_WAIT_HISTORY WHERE sid = 988 ORDER BY seq#;

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