- The words function and procedure are often mixed up. However, there is actually a difference: in a procedure, you can run more than just one transaction. It can, therefore, not be part of a SELECT statement, and has to be executed using the CALL command. In contrast to that, a function has only limited transaction control, and can be part of a SELECT, INSERT, UPDATE, or DELETE statement.
- Trusted languages limit the programmer's ability to perform system calls. They are therefore considered to be safe. Untrusted languages, however, can perform all kinds of operations, and are therefore only available to superusers in order to ensure that no security leaks are possible.
- This question is somewhat hard to answer. Nothing is only good or only bad. The same applies to functions. They can help you to achieve your goal faster...
Mastering PostgreSQL 12
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Mastering PostgreSQL 12
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Overview of this book
Thanks to its reliability, robustness, and high performance, PostgreSQL has become the most advanced open source database on the market. This third edition of Mastering PostgreSQL helps you build dynamic database solutions for enterprise applications using the latest release of PostgreSQL, which enables database analysts to design both physical and technical aspects of system architecture with ease.
Starting with an introduction to the newly released features in PostgreSQL 12, this book will help you build efficient and fault-tolerant PostgreSQL applications. You’ll thoroughly examine the advanced features of PostgreSQL, including logical replication, database clusters, performance tuning, monitoring, and user management. You’ll also work with the PostgreSQL optimizer, configure PostgreSQL for high speed, and understand how to move from Oracle to PostgreSQL. As you progress through the chapters, you’ll cover transactions, locking, indexes, and how to optimize queries for improved performance. Additionally, you’ll learn how to manage network security and explore backups and replications while understanding useful PostgreSQL extensions to help you in optimizing the performance of large databases.
By the end of this PostgreSQL book, you’ll be able to get the most out of your database by implementing advanced administrative tasks effortlessly.
Table of Contents (18 chapters)
Preface
PostgreSQL 12 Overview
Understanding Transactions and Locking
Section 2: Advanced Concepts
Making Use of Indexes
Handling Advanced SQL
Log Files and System Statistics
Optimizing Queries for Good Performance
Writing Stored Procedures
Managing PostgreSQL Security
Handling Backup and Recovery
Making Sense of Backups and Replication
Deciding on Useful Extensions
Troubleshooting PostgreSQL
Migrating to PostgreSQL
Assessment
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