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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
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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
5
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
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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

Chasing down slow queries

After inspecting active queries, checking for I/O problems, and locking, it might be interesting to see which queries are actually causing most of the trouble. Without knowing the actual time-consuming queries, it is pretty hard to improve things in the long run. Fortunately, PostgreSQL provides a module called pg_stat_statements that is capable of tracking queries and providing administrators with statistical information about those queries.

To use this module, it has to be enabled:

test=# CREATE EXTENSION pg_stat_statements;
CREATE EXTENSION

Note that the module has to be enabled inside a database. The system views created by this module will only live in this database for now.

However, we are not done yet:

test=# SELECT * FROM pg_stat_statements;
ERROR:  pg_stat_statements must be loaded via
    shared_preload_libraries

The module is actually loaded when the postmaster starts up. It cannot be loaded on the fly because the information created must survive the disconnection...

CONTINUE READING
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Tech Concepts
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Programming languages
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Troubleshooting PostgreSQL
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