OCA: Oracle 10g administration I study guide by Chip Dawes

By Chip Dawes

Sybex, the major writer of Oracle Certification learn courses, bargains this new, complete research device for applicants getting ready for the Oracle Workshop I examination. Loaded with the educational instruments that earned Sybex the name of "Best learn publications" within the CertCities.com 2003 and 2002 Readers' selection Awards, this definitive source prepares you for the examination required for Oracle 10g qualified affiliate (OCA) and Oracle qualified specialist (OCP) designations. The CD comprises complicated trying out engine with 1000's of pattern examination questions, digital flashcards, in addition to the complete e-book in PDF.

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These controls prevent a user from storing incorrect data in a table. For example, attempting to insert a record that stores a word in a column that is set up to hold numeric values causes a SQL error. The following example shows an example of an INSERT statement that succeeds because all the data being inserted is of the correct datatype, and it shows another statement that fails because a character datatype was inserted into the numeric DEPTNO column: SQL> insert into DEPT (DEPTNO, DNAME, LOC) 2 values (50,’MANUFACTURING’,’MADISON’); 1 row created.

Relational Database Concepts 7 DML commands are used in transactions. A transaction begins with the first DML command that a user issues and ends when the user either makes their changes permanent by issuing a commit command or undoes their changes using the rollback command. Issuing a DDL or a DCL command also ends any prior transactions by causing an implicit commit command to occur. Abnormal terminations of a database connection to a network or a power failure can cause implicit rollbacks to occur.

The SCOPE=MEMORY parameter means that only the currently running instance is affected by the change. For more information, see Chapter 5. 17. B. You would set the PRO, DIS, POO, TICK, CONN, and SESS attributes of the DISPATCHERS parameter accordingly. Remember that the TICK measurement is in 10-minute increments. For more information, see Chapter 5. 18. A, B, D. You can see established, refused, and current connections for each dispatcher when you issue this command. You can also see the maximum number of connections allowed per dispatcher and the state of each dispatcher.

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