Book Image

PostgreSQL for Data Architects

By : Jayadevan M
Book Image

PostgreSQL for Data Architects

By: Jayadevan M

Overview of this book

This book is for developers and data architects who have some exposure to databases. It is assumed that you understand the basic concepts of tables and common database objects, including privileges and security.
Table of Contents (14 chapters)
13
Index

Checkpoint

Checkpoint is a mandatory process. To understand this, let's discuss blocks. PostgreSQL always reads and writes data in blocks. Consider the emp table. It has just one record. The data in this record should add up to a few bytes; we have the value 1 in the column id, and the value Newname in the column first_name. However, this table will consume 8K in the disk because PostgreSQL works with 8K blocks. A block is also referred to as a page. It is easy to verify that PostgreSQL uses blocks. Ensure that our table has just one record as follows:

SELECT * FROM emp;
 id | first_name 
----+------------
  1 | Newname
(1 row)

Then, we find the filename:

SELECT pg_relation_filepath('emp');
 pg_relation_filepath 
----------------------
 base/24741/24742
(1 row)

Now, we check the size of the file:

\! ls -l /pgdata/9.3/base/24741/24742
-rw-------. 1 postgres postgres 8192 Nov 15 11:33 /pgdata/9.3/base/24741/24742

8192 bytes = 8K. So, a table with just one record takes up 8K.

Let&apos...