Top 50 Oracle Interview Questions and Answers
Updated 17 Nov 2024
Q1. What is oracle database architecture
Oracle database architecture is a set of components that work together to manage data storage and retrieval.
Oracle database architecture consists of physical and logical structures
Physical structures include data files, redo logs, and control files
Logical structures include tablespaces, schema objects, and segments
Oracle database architecture also includes background processes and memory structures
Oracle database architecture supports client-server architecture and distribute...read more
Q2. Do you know oracle or sap?
Yes, I have knowledge of both Oracle and SAP.
I have experience working with Oracle databases and SAP ERP systems.
I am familiar with Oracle's SQL and PL/SQL languages.
I have used SAP modules such as SAP FI/CO and SAP MM.
I have completed training courses on Oracle and SAP.
I have successfully implemented Oracle and SAP solutions in previous projects.
Q3. What are the drawbacks of oracle
Oracle has drawbacks such as high cost, complexity, and limited scalability.
High cost: Oracle database licenses and support can be expensive.
Complexity: Oracle has a steep learning curve and can be complex to manage and administer.
Limited scalability: Oracle may not scale well for large and rapidly growing datasets.
Vendor lock-in: Once a company invests in Oracle, it can be difficult to switch to another database system.
Lack of flexibility: Oracle's rigid structure and archit...read more
Q4. difference between oracle db and sql db
Oracle DB is a proprietary RDBMS while SQL DB is a generic term for any RDBMS that uses SQL as its language.
Oracle DB is developed and marketed by Oracle Corporation while SQL DB is a generic term for any RDBMS that uses SQL as its language.
Oracle DB is a proprietary RDBMS while SQL DB is a generic term for any RDBMS that uses SQL as its language.
Oracle DB has its own PL/SQL language while SQL DB uses SQL as its language.
Oracle DB is more expensive than SQL DB.
Oracle DB is mo...read more
Q5. What are types in Oracle
Types in Oracle are data types that define the type of data that can be stored in a column or variable.
Oracle has several built-in data types such as NUMBER, VARCHAR2, DATE, and CLOB.
NUMBER is used to store numeric values, VARCHAR2 is used to store character strings, DATE is used to store dates and times, and CLOB is used to store large character strings.
Oracle also supports user-defined data types, which can be created using the CREATE TYPE statement.
User-defined data types ...read more
Q6. How to setup Oracle DR
Oracle DR setup involves configuring standby database, data replication, and failover testing.
Identify primary and standby database servers
Configure data replication using Oracle Data Guard
Perform failover testing to ensure data consistency
Monitor and maintain DR setup regularly
Q7. Explain RAC in Oracle DB
RAC stands for Real Application Clusters, a feature in Oracle DB that allows multiple instances to access a single database simultaneously.
RAC enables high availability by providing failover and load balancing capabilities.
It allows for scalability by adding more nodes to the cluster.
RAC requires shared storage, such as a SAN or NAS, to store database files accessible by all instances.
Each node in the RAC cluster runs its own instance of the Oracle database.
RAC is commonly us...read more
Q8. In which phase of SUM shadow instance is created?
In the Initialization phase of SUM shadow instance is created.
Shadow instance is created during the Initialization phase of SUM.
It is used for testing and validation before making changes to the actual system.
Helps in minimizing risks and ensuring smooth transition during updates.
Example: In SAP system update management (SUM), shadow instance is created in the Initialization phase.
Oracle Jobs
Q9. How can make erp and do about oracle
ERP integration with Oracle can streamline store operations and improve efficiency.
Integrate ERP system with Oracle for real-time data exchange
Automate inventory management and procurement processes
Utilize Oracle's analytics and reporting capabilities for better decision-making
Implement security measures to protect sensitive data
Train employees on new system to ensure successful adoption
Q10. What is difference between forms personalization & customization in Oracle form 12c.
Forms personalization allows users to customize their own forms without modifying the underlying code, while customization involves making changes to the form's code.
Forms personalization is done by end users without technical knowledge.
Customization involves modifying the form's code by developers.
Forms personalization is limited to changing the behavior of existing form elements.
Customization allows for more extensive changes to the form's functionality.
Forms personalizatio...read more
Q11. What is Collection in Oracle and Types?
Collection in Oracle is a group of elements of the same data type. Types include VARRAY, Nested Table, and Associative Array.
VARRAY is a fixed-size array that can hold a varying number of elements up to the specified limit.
Nested Table is a dynamic array with no fixed size that can be stored in a database column.
Associative Array is a collection of key-value pairs where the key is unique and used to access the corresponding value.
Q12. Explain ora 60 error
ORA-00600 is an internal error code that indicates a software bug or corrupted data.
ORA-00600 is a generic error message that indicates an internal error has occurred.
It is caused by a software bug or corrupted data.
It is a critical error that requires immediate attention from the DBA.
The error message includes a code that identifies the specific error.
The error can be resolved by applying a patch or contacting Oracle support.
Examples of ORA-00600 errors include: ORA-00600: i...read more
Q13. How to troubleshoot Oracle
Troubleshooting Oracle involves identifying and resolving issues with database performance, connectivity, and errors.
Check database connectivity by testing connection using SQL*Plus or SQL Developer
Review alert logs and trace files for error messages and performance issues
Monitor database performance using tools like Oracle Enterprise Manager or AWR reports
Check for resource contention issues such as high CPU or memory usage
Review SQL statements for inefficiencies or errors t...read more
Q14. What is DBMS in Oracle ?
DBMS in Oracle stands for Database Management System, which is a software that manages the storage, retrieval, and organization of data in a database.
DBMS in Oracle is a software system that allows users to define, create, maintain, and control access to the database.
It provides an interface for users to interact with the database and perform various operations like querying, updating, and managing data.
Oracle Database is a popular DBMS that offers features such as data secur...read more
Q15. what is server in oracle
In Oracle, a server refers to a computer system that hosts the Oracle database software and manages data storage, access, and processing.
A server in Oracle is a computer system dedicated to running the Oracle database software.
It manages data storage, access, and processing for the Oracle database.
Examples of Oracle servers include Oracle Exadata, Oracle Database Appliance, and Oracle Cloud Infrastructure.
Q16. What is oracle in software
Oracle in software refers to Oracle Corporation, a multinational computer technology corporation known for its database management systems.
Oracle is a leading provider of relational database management systems (RDBMS).
It offers a wide range of products and services for data management, cloud applications, and more.
Oracle databases are widely used in enterprise applications for storing and managing data efficiently.
Examples of Oracle products include Oracle Database, Oracle Fu...read more
Q17. What is collections in Oracle
Collections in Oracle are data structures that store and manipulate groups of data.
Collections can be used to store data in arrays, lists, or sets.
They can be used to pass data between PL/SQL blocks or between PL/SQL and SQL.
Examples of collections include VARRAYs, nested tables, and associative arrays.
Q18. what is oracle pl/sql
Oracle PL/SQL is a procedural language extension for SQL used to write stored procedures, functions, and triggers.
PL/SQL stands for Procedural Language/Structured Query Language
It is used to enhance the capabilities of SQL by adding procedural constructs
PL/SQL code is executed on the Oracle Database server
It allows the creation of stored procedures, functions, packages, and triggers
PL/SQL can be used for data manipulation, data definition, and data control
Example: CREATE PROC...read more
Q19. What is Dual in oracle DB?
Dual is a special one-row, one-column table in Oracle DB.
Dual is used to perform calculations or execute functions without selecting from a table.
It is often used to generate a sequence of numbers or to concatenate strings.
For example, SELECT 1+1 FROM dual; will return 2.
Dual is automatically created by Oracle and is always available in every Oracle database.
Q20. What data analytics initiatives did you take in Oracle?
As a Product Manager at Oracle, I led data analytics initiatives to improve product performance and customer experience.
Developed and implemented data-driven strategies to optimize product features and pricing.
Analyzed customer behavior and feedback to identify areas for improvement.
Collaborated with cross-functional teams to design and launch new products based on market trends and customer needs.
Used data visualization tools to present insights and recommendations to senior...read more
Q21. Did you worked on Oracle Dataguard?
Yes, I have worked on Oracle Dataguard.
I have experience in configuring and managing Oracle Dataguard for disaster recovery.
I have performed switchover and failover operations to test the failover mechanism.
I have monitored and resolved issues related to Dataguard synchronization and network connectivity.
I have also worked on configuring Active Dataguard for read-only reporting purposes.
Q22. How will you move data from Oracle source to data Lake on azure?
Data can be moved from Oracle source to data Lake on Azure using Azure Data Factory.
Use Azure Data Factory to create a pipeline for moving data from Oracle source to Azure Data Lake
Set up linked services in Azure Data Factory for Oracle and Azure Data Lake
Use copy activity in Azure Data Factory to move data from Oracle to Azure Data Lake
Monitor and manage the data movement process in Azure Data Factory
Q23. How does SLA work in Oracle PA.
SLA in Oracle PA is a set of rules that define the level of service provided to customers.
SLA is defined at the service level and can be customized for each customer
It includes metrics such as response time, resolution time, and availability
SLA violations can trigger alerts and escalations
SLA reports can be generated to track performance
Example: A customer may have an SLA that requires a response within 2 hours and a resolution within 24 hours
Q24. How oracle fetch data when you hits select statements.
Oracle fetches data using the SQL engine and the buffer cache.
When a select statement is executed, the SQL engine parses the statement and creates an execution plan.
The execution plan is used to fetch data from the database.
The buffer cache is used to store frequently accessed data in memory for faster access.
Oracle uses a multiversion read consistency model to ensure that data is consistent.
Data is fetched in blocks called database blocks, which are stored on disk.
Oracle use...read more
Q25. Explain how an insert/update is parsed in Oracle database
An insert/update statement in Oracle database is parsed by the SQL parser to check syntax and semantics.
The SQL parser first checks the syntax of the insert/update statement to ensure it follows the rules of the SQL language.
Next, the parser checks the semantics of the statement, which involves verifying the existence and accessibility of the tables and columns referenced in the statement.
During parsing, the parser also determines the execution plan for the statement, which i...read more
Q26. What is difference between Oracle & SAP.
Oracle and SAP are both enterprise resource planning (ERP) software, but Oracle is known for its database management system while SAP is known for its business process management.
Oracle is known for its database management system, while SAP is known for its business process management.
Oracle offers a wide range of products and services, including databases, cloud solutions, and enterprise software, while SAP focuses primarily on business applications.
Oracle's primary database...read more
Q27. How the oracle type accounts can be configured in CPM?
Oracle type accounts can be configured in CPM by setting up the necessary permissions and access controls.
Create a new user account in Oracle with the appropriate permissions for CPM access
Assign the user account to the CPM application role
Configure the user account settings in CPM to define access levels and restrictions
Q28. What is partitions in Oracle
Partitions in Oracle are a way to divide a large table into smaller, more manageable pieces.
Partitions allow for faster querying and maintenance of large tables
They can be based on a range of values, a list of values, or a hash function
Partitioning can be done on tables, indexes, and materialized views
Examples of partitioning include partitioning by date, region, or customer ID
Q29. can OIC be triggered using ess job ?
Yes, OIC can be triggered using ess job.
OIC can be triggered using Oracle Integration Cloud (OIC) REST APIs.
ESS job can be used to schedule and trigger OIC integrations.
By configuring the ESS job to call the OIC REST API endpoint, OIC can be triggered.
This allows for automation and scheduling of OIC integrations.
Q30. Why Oracle Cerner etc....
Oracle and Cerner are popular choices for healthcare organizations due to their robust features, scalability, and industry-specific functionalities.
Oracle offers a comprehensive suite of healthcare solutions, including electronic health records (EHR) and population health management.
Cerner is known for its interoperability capabilities, allowing seamless data exchange between different healthcare systems.
Both Oracle and Cerner have a strong presence in the healthcare industry...read more
Q31. What is explain plan in oracle
Explain plan is a tool in Oracle that shows the execution plan of a SQL statement.
Explain plan is used to analyze and optimize SQL queries.
It shows the order in which tables are accessed, the join methods used, and the access methods used.
The output of explain plan can be viewed in text or graphical format.
It helps in identifying performance bottlenecks and optimizing the query execution time.
Explain plan can be generated using the EXPLAIN PLAN statement or the DBMS_XPLAN pac...read more
Q32. What is oracle database structure?
Oracle database structure refers to the organization of data in tables, indexes, views, and other database objects.
Consists of tables, which store data in rows and columns
Includes indexes for faster data retrieval
Views provide virtual representations of data from one or more tables
Constraints ensure data integrity and enforce rules
Stored procedures and functions for processing data
Q33. Difference of database clone process between cdb and noncdb databases
The process of cloning a database differs between cdb and noncdb databases.
In cdb databases, the clone process involves creating a new PDB by copying the existing PDB's metadata and data files.
In noncdb databases, the clone process involves creating a new database by copying the existing database's data files and redo logs.
CDB clones can be created using the DBMS_PDB package, while non-CDB clones can be created using RMAN or the DUPLICATE command.
CDB clones can be created as ...read more
Q34. What is what if analysis in oracle policy automation?
What-if analysis in Oracle Policy Automation is a tool that allows users to simulate different scenarios and evaluate their impact on policy outcomes.
Users can create hypothetical scenarios by changing input values and assumptions
The tool then calculates the impact of these changes on policy outcomes
This helps users make informed decisions and identify potential risks and opportunities
For example, a user can simulate the impact of changing eligibility criteria on the number o...read more
Q35. What is pragma autonomous transactions. How does it work.
Pragma autonomous transactions allow a PL/SQL subprogram to commit or rollback its own transactions independently of its caller.
Pragma autonomous transactions are used to execute a transaction independently of the main transaction.
It allows a subprogram to commit or rollback its own transactions without affecting the main transaction.
Autonomous transactions are often used for logging, auditing, or error handling purposes.
To declare an autonomous transaction, use the PRAGMA AU...read more
Q36. what is Oracle Block Change
Oracle Block Change is a feature that tracks and records changes made to database blocks.
Oracle Block Change is used for efficient data replication and synchronization.
It helps in identifying and transferring only the changed data blocks instead of the entire database.
Oracle GoldenGate utilizes Oracle Block Change technology for real-time data integration.
Block Change Tracking (BCT) is a feature in Oracle Database that enables incremental backups by tracking changed blocks.
Q37. Function in Oracle Database
A function in Oracle Database is a named PL/SQL block that can accept parameters and return a value.
Functions can be used to perform calculations, manipulate data, or return specific values.
They can be called from SQL queries or other PL/SQL blocks.
Functions must return a single value of a specified data type.
Q38. Flow of process in oracle
The flow of process in Oracle involves defining requirements, designing solutions, implementing, testing, and deploying.
Define requirements based on business needs
Design solutions using Oracle tools and technologies
Implement the designed solutions
Test the implemented solutions for functionality and performance
Deploy the tested solutions for production use
Q39. Shift to Data Engineering from Oracle
Transitioning from Oracle to Data Engineering
Learn SQL and database concepts
Familiarize with ETL tools like Apache NiFi and Talend
Gain knowledge of big data technologies like Hadoop and Spark
Develop skills in programming languages like Python and Java
Understand data modeling and schema design
Get hands-on experience with cloud platforms like AWS and Azure
Q40. 1. oracle upgrade from one version to another.
Oracle upgrade involves planning, testing, and executing the upgrade process.
Identify the current and target versions
Review the upgrade documentation and release notes
Perform a test upgrade in a non-production environment
Backup the database before upgrading
Run the pre-upgrade script to identify potential issues
Upgrade the software and database components
Run the post-upgrade script to complete the upgrade process
Perform functional and performance testing after the upgrade
Q41. Data types in oracle
Oracle supports various data types including numeric, character, date, and LOB types.
Numeric data types include NUMBER, INTEGER, and FLOAT.
Character data types include CHAR, VARCHAR2, and CLOB.
Date data types include DATE and TIMESTAMP.
LOB data types include BLOB and CLOB.
Q42. Subqueries in oracle
Subqueries in Oracle are queries nested within another query to retrieve data from multiple tables.
Subqueries can be used in SELECT, INSERT, UPDATE, and DELETE statements.
Subqueries can return a single value, a single row, multiple rows, or a table.
Subqueries can be correlated or non-correlated, depending on whether they reference columns from the outer query.
Example: SELECT * FROM employees WHERE department_id = (SELECT department_id FROM departments WHERE department_name = ...read more
Q43. Oracle partitioning in detail
Oracle partitioning is a technique to divide large tables into smaller, more manageable pieces.
Partitioning improves query performance by reducing the amount of data that needs to be scanned.
Partitioning can be done based on range, list, hash, or composite methods.
Partitioning can also be done vertically, where columns are divided into separate partitions.
Partitioning requires careful planning and consideration of the data and queries involved.
Examples of partitioning include...read more
Q44. Oracle and software of WMS
Oracle and WMS software are both commonly used in the field of supply chain management.
Oracle is a database management system often used for storing and managing supply chain data.
WMS (Warehouse Management System) software is used to manage inventory and operations within a warehouse.
Oracle can be integrated with WMS software to provide a comprehensive supply chain management solution.
Examples of WMS software that can be integrated with Oracle include SAP, Manhattan Associate...read more
Q45. oracle bill in advance accounting entries
Oracle bill in advance accounting entries
When billing in advance, recognize revenue over the service period
Debit Accounts Receivable and credit Unearned Revenue upon billing
Recognize revenue by debiting Unearned Revenue and crediting Revenue over time
Adjust entries as revenue is earned
Q46. what is oracle tell you about oracle ebs
Oracle EBS is an integrated suite of business applications for managing various aspects of a business.
Oracle EBS stands for Oracle E-Business Suite
It includes modules for financials, supply chain management, human resources, and more
Oracle EBS helps organizations streamline their business processes and improve efficiency
Q47. What are the components of logical database structure of Oracle database?
Components of logical database structure in Oracle include tables, views, indexes, sequences, and synonyms.
Tables: Store data in rows and columns.
Views: Virtual tables based on SQL query results.
Indexes: Improve query performance by providing quick access to rows.
Sequences: Generate unique numbers for primary key values.
Synonyms: Alias for database objects to simplify queries.
Q48. Architecture of oracle database, expdp
Oracle database architecture consists of memory structures, background processes, and physical files.
Oracle database has a shared memory architecture
Memory structures include SGA and PGA
Background processes include PMON, SMON, DBWR, LGWR, etc.
Physical files include data files, control files, redo log files, etc.
expdp is a utility used for exporting data from an Oracle database
Q49. Oracle database architecture? Multi talent architecture in oracle 12c ?explain
Oracle database architecture and multi-tenant architecture in Oracle 12c
Oracle database architecture includes physical and logical structures
Multi-tenant architecture in Oracle 12c allows multiple pluggable databases to share a single container database
Each pluggable database has its own set of tablespaces, users, and schemas
This architecture reduces hardware and software costs and simplifies database management
Q50. Explain about oracle database architecture?
Oracle database architecture consists of memory structures, background processes, and physical files.
Memory structures include SGA and PGA
Background processes include PMON, SMON, DBWn, LGWR, CKPT, etc.
Physical files include data files, control files, redo log files, etc.
Oracle database architecture follows a client-server model
Oracle database architecture supports multi-tier architecture
Q51. You have a background with Oracle, so is there a s preference of working on oracle over SAP?
There is no preference of working on Oracle over SAP based on my background.
Both Oracle and SAP have their own strengths and weaknesses.
The choice between Oracle and SAP depends on the specific requirements of the project or organization.
Oracle is known for its robust database management system and comprehensive suite of business applications.
SAP, on the other hand, is renowned for its integrated enterprise resource planning (ERP) solutions.
It is important to evaluate factors...read more
Q52. What is SQL and what is oracle?
SQL is a programming language used to manage and manipulate relational databases. Oracle is a relational database management system.
SQL stands for Structured Query Language
It is used to manage and manipulate data in relational databases
Oracle is a popular relational database management system
It is used to store and manage large amounts of data
Oracle uses SQL as its primary programming language
Q53. How to add RAC node in19c DB?
To add a RAC node in 19c DB, you need to run the 'addNode.sh' script on the new node.
Ensure the new node meets all the prerequisites for adding to the RAC cluster.
Run the 'addNode.sh' script on the new node to add it to the existing RAC cluster.
Verify the addition of the new node by checking the cluster status and resources.
Q54. Oacore issue encountered?
Oacore issue refers to problems encountered in the Oracle Application Framework (OAF) layer of Oracle E-Business Suite.
Oacore issues can cause application performance problems, such as slow page load times or unresponsive pages.
Common causes of Oacore issues include memory leaks, database connectivity problems, and configuration errors.
To troubleshoot Oacore issues, DBAs can use tools like Oracle Enterprise Manager (OEM) and log files to identify the root cause of the problem...read more
Q55. Oracle collections in details
Oracle collections are data structures used to store and manipulate sets of data in PL/SQL.
Collections can be nested within each other
Types of collections include associative arrays, nested tables, and VARRAYs
Collections can be used to pass multiple values to a function or procedure
Collections can be used to bulk collect data from a query
Collections can be declared as types or as variables
Q56. Clone oracle database without down time
Use Oracle RMAN to clone database without downtime
Use RMAN duplicate command to create a clone of the database
Perform the clone on a separate server to avoid downtime
Use incremental backups to reduce the time required for the clone
Configure the clone to use a different database name and unique file locations
Q57. Partitioning in oracle
Partitioning in Oracle allows tables, indexes, and index-organized tables to be subdivided into smaller, more manageable pieces.
Partitioning improves query performance by allowing operations to be performed on individual partitions instead of the entire table.
Types of partitioning include range, list, hash, and composite partitioning.
Example: Creating a range partitioned table based on a date column to store data for each month separately.
Q58. explain about oracle architecture ?
Oracle architecture is a multi-layered design that includes physical, memory, and process components.
Oracle architecture consists of physical, memory, and process components.
The physical component includes data files, control files, and redo log files.
The memory component includes the System Global Area (SGA) and Program Global Area (PGA).
The process component includes background processes and user processes.
Oracle architecture is designed to provide high availability, scalab...read more
Q59. SQL and Oracle the difference
SQL is a language used to manage relational databases, while Oracle is a relational database management system.
SQL is a language used to create, modify, and query databases.
Oracle is a specific relational database management system that uses SQL.
SQL can be used with other database management systems besides Oracle.
Oracle has additional features beyond standard SQL, such as PL/SQL for procedural programming.
SQL is a standard language, while Oracle is a specific product.
SQL is ...read more
Q60. Collections in Oracle
Collections in Oracle are data structures used to store and manipulate groups of data.
Collections can be nested tables, varrays, or associative arrays.
Nested tables are like one-dimensional arrays, varrays are like arrays with a maximum size, and associative arrays are like dictionaries.
Collections can be used to pass multiple values as a single parameter to a stored procedure or function.
Example: DECLARE TYPE emp_list IS TABLE OF employees%ROWTYPE;
Example: DECLARE TYPE phone...read more
Q61. Define about Oracle architecture
Oracle architecture refers to the structure and components of the Oracle database system.
Oracle architecture consists of physical and logical components.
Physical components include memory, storage, and processes.
Logical components include instances, databases, and schemas.
Oracle uses a client-server architecture.
Oracle database is divided into tablespaces and data files.
Oracle architecture supports high availability and scalability.
Examples of Oracle architecture components a...read more
Q62. Oracle queries examples
Examples of Oracle queries
Use SELECT statement to retrieve data from a table
Use WHERE clause to filter results based on a condition
Use JOIN to combine rows from two or more tables based on a related column
Q63. Tell me details of Oracle database architecture?
Oracle database architecture consists of multiple components like instance, memory structures, and physical storage.
Oracle database architecture includes instance, memory structures, and physical storage.
Instance consists of background processes and memory structures like SGA and PGA.
Physical storage includes data files, control files, and redo log files.
Oracle database architecture allows for scalability, high availability, and performance tuning.
Q64. Tell me about Oracle Architecture
Oracle Architecture is the structure and components of the Oracle database system.
Consists of physical and logical structures
Physical structures include data files, control files, redo log files
Logical structures include tablespaces, schema objects
Uses memory structures like SGA and PGA for processing data
Processes like background processes and server processes handle database operations
Q65. expain oracle database architecture?
Oracle database architecture is a multi-tiered system with components like client, server, and storage.
Consists of physical and logical structures
Includes processes like SQL processing, memory management, and I/O management
Client communicates with server through SQL*Net
Server manages data storage and retrieval
Storage includes data files, control files, and redo log files
Q66. Architecture of Oracle database
The architecture of Oracle database consists of multiple components like instance, memory structures, and physical and logical storage.
Oracle database architecture includes an instance, which consists of memory structures like SGA and PGA.
The instance is responsible for managing the database and executing user requests.
Physical storage in Oracle database is organized into data files, control files, and redo log files.
Logical storage includes tablespaces, which are divided int...read more
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