PostgreSQL Objective Questions & Answers for Professionals Set-2
1. Which PostgreSQL extension provides support for handling XML data?
Explanation: The "xml2" extension in PostgreSQL provides support for handling XML data, including parsing and querying.
2. Which PostgreSQL feature allows creating custom functions in a variety of programming languages, such as Python or Perl, for use in SQL queries?
Explanation: The "PL/Python" language in PostgreSQL allows creating custom functions using the Python programming language for use in SQL queries.
3. Which parameter controls the behavior of the autovacuum process in PostgreSQL?
Explanation: The "autovacuum_vacuum_cost_limit" parameter in PostgreSQL controls the maximum cost that the autovacuum process can incur during vacuum operations.
4. What is the purpose of the "pg_stat_activity" view in PostgreSQL?
Explanation: The "pg_stat_activity" view in PostgreSQL displays information about the current queries being executed by active connections.
5. Which PostgreSQL extension provides support for handling range types, allowing you to work with continuous ranges of values?
Explanation: The int4range data type and related functions in PostgreSQL provide support for handling range types, useful for working with continuous ranges of integer values.
6. Which PostgreSQL feature provides support for full-text search and indexing, allowing you to search for words or phrases efficiently?
Explanation: The "pg_textsearch" feature in PostgreSQL provides support for full-text search and indexing, allowing efficient searching for words or phrases in textual data.
7. What is the role of the "pg_database_size" function in PostgreSQL?
Explanation: The "pg_database_size" function in PostgreSQL is used to retrieve the size of a specific database on the server
8. Which PostgreSQL extension allows you to create and manage materialized views, which are precomputed query results stored as tables?
Explanation: The "pg_mview" extension in PostgreSQL allows you to create and manage materialized views, which are precomputed query results stored as tables.
9. What is the purpose of the "pg_config" utility in PostgreSQL?
Explanation: The "pg_config" utility in PostgreSQL is used to retrieve information about the PostgreSQL installation, such as compiler flags, version, and file locations.
10. Which PostgreSQL extension allows you to define custom aggregate functions that can be used in SQL queries?
Explanation: The "CREATE AGGREGATE" statement in PostgreSQL allows you to define custom aggregate functions that can be used in SQL queries.
11. In PostgreSQL, what is the role of the "pg_log" directory?
Explanation: The "pg_log" directory in PostgreSQL is used to store system logs, including messages and events related to the database server.
12. Which PostgreSQL extension provides support for handling UUID (Universally Unique Identifier) data types?
Explanation: The "uuid-ossp" extension in PostgreSQL provides support for generating and working with UUID (Universally Unique Identifier) data types.
13. Which PostgreSQL extension provides support for handling IP addresses and CIDR (Classless Inter-Domain Routing) notation?
Explanation: The "ipaddr" extension in PostgreSQL provides support for handling IP addresses and CIDR notation, including useful functions for network operations.
14. Which parameter in PostgreSQL determines the maximum number of simultaneously allowed prepared transactions?
Explanation: The "max_prepared_transactions" parameter in PostgreSQL determines the maximum number of simultaneously allowed prepared transactions.
15. Which PostgreSQL extension provides support for handling temporal data, including periods and intervals?
Explanation: The "pg_temporal" extension in PostgreSQL provides support for handling temporal data, including periods and intervals, enabling efficient temporal queries.
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