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The SQL*Plus FLASHBACK DATABASE command performs the same function as the RMAN FLASHBACK DATABASE command: it returns the database to a prior state. Note that using Flashback Database requires that you create a flash recovery area for your database and enable the collection of flashback logs. See Oracle Database Backup and Recovery Basics for more details about how the Flashback Database feature..

An Index:Is a schema objectCan be used by the Oracle server to speed up the retrieval of rows by using a pointer.Can reduce disk I/O by using a rapid path access method to locate data quicklyIs independent of the table that it indexedIs used and maintained automatically by the Oracle server Unique Index : Primary Key or Unique : automatically create an indexNOnunique Index : User created index. ..

An Index:Is a schema objectCan be used by the Oracle server to speed up the retrieval of rows by using a pointer.Can reduce disk I/O by using a rapid path access method to locate data quicklyIs independent of the table that it indexedIs used and maintained automatically by the Oracle server Unique Index : Primary Key or Unique : automatically create an indexNOnunique Index : User created index. ..

1. Defines a condition 2. Not-Allowed expressions : - CURRVAL, NEXTVAL, LEVEL, ROWNUM pseudocolumns - SYSDATE, UID, USER, and USERENV functions - Queries that refer to other values in other rows ex) .... , salary NUMBER(2) CONSTRAINT emp_salary_min CHECK (salary > 0 ), ..... 3. A single column can have multiple CHECK constraints

1. Defines a condition 2. Not-Allowed expressions : - CURRVAL, NEXTVAL, LEVEL, ROWNUM pseudocolumns - SYSDATE, UID, USER, and USERENV functions - Queries that refer to other values in other rows ex) .... , salary NUMBER(2) CONSTRAINT emp_salary_min CHECK (salary > 0 ), ..... 3. A single column can have multiple CHECK constraints

1. Only one primary key can be created for each table.2. Uniquely identifies each row in a table.3. Enforces uniqueness.4. Enforces NOT NULL constraints implicitly.

1. Only one primary key can be created for each table.2. Uniquely identifies each row in a table.3. Enforces uniqueness.4. Enforces NOT NULL constraints implicitly.

Defines a condition that each row must satisfy The following expressions are not allowed: - References to CURRVAL, NEXTVAL, LEVEL, and ROWNUM pseudocolumns - Call to SYSDATE, UID, USER, and USERENV functions - Queries that refer to other values in other rows ..., salaryNUMBER(2) CONSTRAINTemp_salary_min CHECK (salary > 0),...

Defines a condition that each row must satisfy The following expressions are not allowed: - References to CURRVAL, NEXTVAL, LEVEL, and ROWNUM pseudocolumns - Call to SYSDATE, UID, USER, and USERENV functions - Queries that refer to other values in other rows ..., salaryNUMBER(2) CONSTRAINTemp_salary_min CHECK (salary > 0),...

TIMESTAMP : Date with fractional second INTERVAL YEAR TO MONTH : Stored as an interval of years and months INTERVAL DAY TO SECOND : Stored as an interval of days, hours, minutes and seconds Representing the Difference Between Datetime ValuesUse the INTERVAL DAY TO SECOND datatype to represent the precise difference between two datetime values. For example, you might use this value to set a remin..