June 2002
Intermediate to advanced
800 pages
16h 3m
English
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8.6. Transactions and Locking
In contrast to some other open source databases, PostgreSQL provides a highly developed system for handling transactions. This is one of the features that makes PostgreSQL such a good choice for almost all purposes.
In this section you will learn about PostgreSQL's transaction-handling capabilities, and you will see how transactions can be used efficiently to build even more sophisticated applications and to protect your data.
8.6.1. The Main Idea of Transactions
Imagine a simple example: Your database contains a table with 200 million records in it. One user starts a query that goes through all records and computes the average of a column. Because the table is very large, this will take some time. While the query ...
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