Book Image

PostgreSQL for Data Architects

By : Jayadevan M
Book Image

PostgreSQL for Data Architects

By: Jayadevan M

Overview of this book

Table of Contents (19 chapters)
PostgreSQL for Data Architects
About the Author
About the Reviewers


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:

 id | first_name 
  1 | Newname
(1 row)

Then, we find the filename:

SELECT pg_relation_filepath('emp');
(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's try inserting some...