Answer:- The redo log’s main purpose is to keep track of all data changes. If a failure stops personalised data from being permanently written to data files, corrections may be made from the redo log, ensuring that the work is never wasted.

Answer:- A parameter file is a text file that includes a list of initialization parameters as well as their values. Initialization parameters are defined in a parameter file that is exclusive to your installation.

Answer:- The recovery catalog is a database scheme that contains the metadata that RMAN manages for data restoration and recovery processes. The metadata used by RMAN for reinstallation and healing process is stored in a recovery catalog. The RMAN metadata is still present in the recovery catalogue even if the target control file and all backups are lost.

Answer:- When the database is created, the system tablespace is formed. Since this tablespace contains all of the data dictionary tables, it is used to create a number of database objects. For the database to run efficiently, the system tablespace must remain online.

Answer:- Running a query from the command prompt will reveal to you the Oracle version. The version information is held in the v$version table. SELECT * FROM v$version;

Answer:- For numerical columns in database tables, a sequence produces a serial list of unique numbers. For data where we want to insert data in a systematic way, we may use the sequence on columns.

Answer:- In a database, the table is the first physical object. Oracle divides data into rows and columns using tables in a database. In a database, the table is the first physical object.

Answer:- A query is added to any view in order to define specific rows and columns of the table. The view is a type of virtual table. Read-only and read-write views are available types of views.

Answer:- The advantages of using a view in the table are • It is a subset of the data in table • It store complex queries • It can simplify multiple tables into one • It occupies very little space • It presents the data from different perspectives

Answer:- A tablespace is a logical storage unit that groups together similar logical structures. It is the logical structure that will organise all of the database’s objects.

Answer:- Every database in Oracle has a tablespace called SYSTEM, which is generated automatically when the database is created. It also includes a data dictionary table for the entire set of data.

Answer:- Each database has one or more tablespaces, each of which is divided into one or more data files.

Answer:- Materialized views are items that contain condensed sets of data from base tables that have been summarised, clustered, or aggregated. They’re commonly used in data centres and decision-making systems.

Answer:- The SELECT statement is used to retrieve a collection of unique values from a database table based on the conditions defined in a SQL query.