C validating business rules

The storage parameters for a truncated table, cluster, or associated indexes are not changed as a result of the truncation.These Database triggers are procedures that are stored in the database and activated ("fired") when specific conditions occur, such as adding a row to a table.CREATE SCHEMA AUTHORIZATION scott CREATE TABLE dept ( deptno NUMBER(3,0) PRIMARY KEY, dname VARCHAR2(15), loc VARCHAR2(25)) CREATE TABLE emp ( empno NUMBER(5,0) PRIMARY KEY, ename VARCHAR2(15) NOT NULL, job VARCHAR2(10), mgr NUMBER(5,0), hiredate DATE DEFAULT (sysdate), sal NUMBER(7,2), comm NUMBER(7,2), deptno NUMBER(3,0) NOT NULL CONSTRAINT dept_fkey REFERENCES dept) CREATE VIEW sales_staff AS SELECT empno, ename, sal, comm FROM emp WHERE deptno = 30 WITH CHECK OPTION CONSTRAINT sales_staff_cnst GRANT SELECT ON sales_staff TO human_resources; package, which lets you collect statistics in parallel, collect global statistics for partitioned objects, and fine tune your statistics collection in other ways.The cost-based optimizer, which depends upon statistics, will eventually use only statistics that have been collected by statement to gather statistics about the physical storage characteristics of a table, index, or cluster.Validation is less comprehensive with ongoing DML affecting the object, but this is offset by the flexibility of being able to perform statement for a thorough analysis of the index.Since typically most objects in a database are not corrupt, you can use this quick query to eliminate a number of tables as candidates for corruption and only use the ANALYZE statement on tables that might be corrupt.

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Also, as each row is deleted, triggers can be fired.For example, in rare cases such as hardware or other system failures, an index can become corrupted and not perform correctly.When validating the index, you can confirm that every entry in the index points to the correct row of the associated table.To validate an index, run the following query: Any rows that appear in the output table are chained.You can eliminate chained rows only by increasing your data block size.

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