Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying PostgreSQL Administration Essentials
  • Table Of Contents Toc
PostgreSQL Administration Essentials

PostgreSQL Administration Essentials

By : Hans-Jürgen Schönig
3.1 (8)
Buy this Book
close
close
PostgreSQL Administration Essentials

PostgreSQL Administration Essentials

3.1 (8)
By: Hans-Jürgen Schönig
Buy this Book

Overview of this book

If you are a database administrator who needs to get to grips with PostgreSQL quickly and efficiently, then this book is for you. This book will also be highly beneficial if you are a project leader or a developer who is interested in knowing more about database systems or bottleneck detection, as it will enable you to work more closely and cooperatively with your administrators.
Table of Contents (9 chapters)
close
close
close
Preface
Icon
Preface
Icon
What this book covers
Icon
What you need for this book
Icon
Who this book is for
Icon
Conventions
Icon
Reader feedback
Icon
Customer support
Lock Free Chapter
1
1. Installing PostgreSQL
Icon
1. Installing PostgreSQL
Icon
Preparing your setup
Icon
Understanding the existing databases
Icon
Creating databases
Icon
Summary
2
2. Indexing and Performance Tuning
chevron up
Icon
2. Indexing and Performance Tuning
Icon
Using simple binary trees
Icon
Understanding the concept of execution plans
Icon
Dealing with different types of indexes
Icon
Detecting missing indexes
Icon
Detecting slow queries
Icon
Adjusting memory parameters
Icon
Summary
3
3. Users and Permissions
Icon
3. Users and Permissions
Icon
Understanding PostgreSQL security
Icon
Summary
4
4. Managing Logfiles
Icon
4. Managing Logfiles
Icon
Understanding the PostgreSQL log architecture
Icon
Configuring the amount of log output
Icon
Making log creation more fine grained
Icon
Summary
5
5. Backup and Recovery
Icon
5. Backup and Recovery
Icon
Importing and exporting data
Icon
Performing backups
Icon
Summary
6
6. Handling Replication and Improving Performance
Icon
6. Handling Replication and Improving Performance
Icon
Understanding the PostgreSQL transaction log
Icon
Configuring the checkpoints
Icon
Setting up an asynchronous replication
Icon
Upgrading to synchronous replication
Icon
Improving and monitoring the replication
Icon
Handling point-in-time recovery
Icon
Understanding timelines
Icon
Summary
7
7. Monitoring PostgreSQL
Icon
7. Monitoring PostgreSQL
Icon
Understanding the system statistics of PostgreSQL
Icon
Integrating Nagios
Icon
Handling Linux cgroups
Icon
Summary
8
Index
Icon
Index

Detecting missing indexes

Now that we have covered the basics and some selected advanced topics of indexing, we want to shift our attention to a major and highly important administrative task: hunting down missing indexes.

When talking about missing indexes, there is one essential query I have found to be highly valuable. The query is given as follows:

test=# \x
Expanded display (expanded) is on.
test=# SELECT   relname, seq_scan, seq_tup_read, 
      idx_scan, idx_tup_fetch, 
      seq_tup_read / seq_scan 
  FROM   pg_stat_user_tables 
  WHERE   seq_scan > 0 
  ORDER BY seq_tup_read DESC;
-[ RECORD 1 ]-+---------
 relname       | t_user   
 seq_scan      | 824350        
 seq_tup_read  | 2970269443530 
 idx_scan      | 0        
 idx_tup_fetch | 0        
 ?column?      | 3603165

The pg_stat_user_tables option contains statistical information about tables and their access patterns. In this example, we found a classic problem. The t_user table has been scanned close to 1 million times...

CONTINUE READING
83
Tech Concepts
36
Programming languages
73
Tech Tools
Icon Unlimited access to the largest independent learning library in tech of over 8,000 expert-authored tech books and videos.
Icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Icon 50+ new titles added per month and exclusive early access to books as they are being written.
PostgreSQL Administration Essentials
End of Section 2
Next Section
notes
bookmark Notes and Bookmarks search Search in title playlist Add to playlist font-size Font size

Change the font size

margin-width Margin width

Change margin width

day-mode Day/Sepia/Night Modes

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY

Submit Your Feedback

Modal Close icon
Modal Close icon
Modal Close icon