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  • Book Overview & Buying Troubleshooting PostgreSQL
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Troubleshooting PostgreSQL

Troubleshooting PostgreSQL

By : Hans-Jürgen Schönig
4.2 (5)
Buy this Book
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Troubleshooting PostgreSQL

Troubleshooting PostgreSQL

4.2 (5)
By: Hans-Jürgen Schönig
Buy this Book

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

Fixing common replication issues

Given the goals set for this chapter, the last topic to be done is the customer's complaint about replication, which tends to break from time to time. In PostgreSQL, replication never breaks for technical reasons; only misconfiguration can lead to unexpected behavior. Here are the most common issues:

  • Replication stops and falls behind

  • Queries fail on the slave for some reason

Let's attack one problem at a time.

Fixing stopped replication

One of the most common problems is that at some point, replication just stops. The slave will start to fall behind, and the result coming back from a slave will be old and outdated. There are a couple of reasons for this kind of behavior:

  • Constant lack of bandwidth

  • Replication conflicts

In many cases, bandwidth is a serious issue. If two servers are connected using a 100 MB interconnect, it can easily happen that the slave falls behind and eventually dies if the write load is constantly higher than 10 MB per second. Keep in mind...

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