HKR oracle database interview questions and answers article mainly focus on providing the best service. Do you aware of how this Oracle database occupying the tech market? Let me explain in brief, According to the Techgig survey, the oracle database administration tool emerging as a power relational database with a total market share of 48.3%. So you can expect that there is a huge opening for the Oracle database administrator profession. We are here to help our audience to learn the important Oracle interview questions asked by top tech companies. Let’s begin our journey to explore your skill sets related to Oracle database administration tool;
Ans: Oracle data base is one of the multi-model database management tools; this tool is developed and marketed by Oracle corporations. The main purpose of using the Oracle database tool is to run any online transaction processing, data warehousing, and work well with mixed database workloads.
Ans: Below is the list of roles and responsibility of any Oracle database Administrator;
Ans: The below are the four possible ways to execute an SQL query against an Oracle database;
Ans: Oracle database software automatically maintains and uses the data indexes. When you make any changes to the table then oracle database software automatically reflects the changes to relevant indexes.
Ans: A synonym in Oracle is an identifier that is used to refer to another database object in a SQL statement. This type of database synonym will be created for a table, view, Sequence, and another Synonym.
Ans: Password is used by Database users which are stored in the data dictionary of the database table. This password is used when the user wants to log into the database. At the same time, the username and password are provided by the database user to check against data values they are stored in the data base server.
Ans: Firstly you need to query the file called “V$pwfile_users” which is used to view all the information related to the database.
Then execute the SQL query as follows;
Sql > SELECT * FROM v$pwfile_users;
This query returns the four columns for each database user and this action can be done by using a password.
Ans: The following are the four important columns used by each database user;
USERNAME -> this column is used to show the users’ USERNAME and PASSWORD details.
SYSDBA -> this column is used to check whether the user has SYSDBA privileges or not.
SYSOPER -> this column is used to check whether the database user has SYSOPER privileges or not.
SYSASM -> this column is used to check whether the database user has SYSASM privileges or not.
Ans: The below table explains the major differences between Oracle database and SQL database server such as;
Ans: The following are the important constitutes available in the Oracle database such as;
Data Files: These types of files hold “USER” data or “SYSTEM” data. Here the “data dictionary” of the database server is an example of a “system” data type.
OnlineRedo log files: this type of data file holds the “change” records. All the data files must be written in online redo log files.
Control files: these are small files but essential for the database. This file contains physical structure data base information and online redo log files details.
Ans: By using these three tools you can start up an Oracle database;
1. SQL Plus
2. Oracle Enterprise manager
AWR report: this report is mainly used to analyze the query elapsed executions and time.
ADDM report: this is a type of utility that offers recommendations and statistics collections.
Ans: The three different types of backups available;
3. Cold backup.
Ans: Below are the important database components such as;
1. set line 200;
2. set page size 9999;
3. Col COMP_ID format a15;
4. Col COMP_NAME format a50;
5. Col COMP_ID, COMP_NAME, STATUS from dba_registry;
Ans: They are;
1. Database Designs,
2. Memory allocation
3. Disk Input/output
4. Database contention
5. OS level (CPU).