Book Image

Troubleshooting PostgreSQL

Book Image

Troubleshooting PostgreSQL

Overview of this book

If you are a database administrator looking for solutions to common PostgreSQL problems, this is the book for you. The book is suitable for people with intermediate and professional expertise.

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Troubleshooting PostgreSQL
Mar, 2015 | 164 pages
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Table of Contents (12 chapters)
Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Installing PostgreSQL
1. Installing PostgreSQL
Deciding on a version number
Methods of installing PostgreSQL
Memory and kernel issues
Adding checksums to a database instance
Preventing encoding-related issues
Avoiding template pollution
Summary
2
2. Creating Data Structures
2. Creating Data Structures
Grouping columns the right way
Deciding on data types and structure
Deciding on normalization
Summary
3
3. Handling Indexes
3. Handling Indexes
Understanding indexes in PostgreSQL
Avoiding trouble with indexes
Solving common problems
Handling LIKE queries
Finding good matches
Fixing full-text search
Summary
4
4. Reading Data Efficiently and Correctly
4. Reading Data Efficiently and Correctly
Understanding the power of NULL
Fixing disastrous joins
Reading large amounts of data
Understanding prepared queries
Summary
5
5. Getting Transactions and Locking Right
5. Getting Transactions and Locking Right
The PostgreSQL transaction model
Transaction isolation
Inspecting locks
Summary
6
6. Writing Proper Procedures
6. Writing Proper Procedures
Choosing the right language
Managing procedures and transactions
Procedures and indexing
Understanding memory
Summary
7
7. PostgreSQL Monitoring
7. PostgreSQL Monitoring
Checking the overall database behavior
Detecting I/O bottlenecks
Checking for conflicts
Chasing down slow queries
Inspecting internal information
Integrating with external tools
Alternative tools
Summary
8
8. Fixing Backups and Replication
8. Fixing Backups and Replication
Using pg_dump
Managing point-in-time recovery
Making use of asynchronous replication
Switching to synchronous replication
Handling timelines
Summary
9
9. Handling Hardware and Software Disasters
9. Handling Hardware and Software Disasters
Checksums – preventing silent corruption
Zeroing out damaged pages
Dealing with index corruption
Dumping individual pages
Resetting the transaction log
Power-out-related issues
Summary
10
10. A Standard Approach to Troubleshooting
10. A Standard Approach to Troubleshooting
Getting an overview of the problem
Attacking low performance
Fixing common replication issues
Summary
11
Index
Index

Chapter 5. Getting Transactions and Locking Right

Transactions are a core technique of every professional relational database system. In fact, it is pretty hard to imagine a world without transactions these days. Atomic deletions, proper locking, and all the functionalities provided by a modern relational system are simple and expected from a modern system, and many applications rely on them. Therefore, this chapter is all about transactions and locking.

The following topics will be covered:

  • The PostgreSQL transaction model
  • Basic locking
  • FOR UPDATE, FOR SHARE, and NOWAIT
  • Locking tables
  • Understanding transaction isolation levels
  • Indexes and foreign keys
  • Transactions and sequences
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