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PostgreSQL High Performance Cookbook

You're reading from   PostgreSQL High Performance Cookbook Mastering query optimization, database monitoring, and performance-tuning for PostgreSQL

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Product type Paperback
Published in Mar 2017
Publisher Packt
ISBN-13 9781785284335
Length 360 pages
Edition 1st Edition
Languages
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Authors (2):
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Chitij Chauhan Chitij Chauhan
Author Profile Icon Chitij Chauhan
Chitij Chauhan
Dinesh Kumar Dinesh Kumar
Author Profile Icon Dinesh Kumar
Dinesh Kumar
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Toc

Table of Contents (13) Chapters Close

Preface 1. Database Benchmarking FREE CHAPTER 2. Server Configuration and Control 3. Device Optimization 4. Monitoring Server Performance 5. Connection Pooling and Database Partitioning 6. High Availability and Replication 7. Working with Third-Party Replication Management Utilities 8. Database Monitoring and Performance 9. Vacuum Internals 10. Data Migration from Other Databases to PostgreSQL and Upgrading the PostgreSQL Cluster 11. Query Optimization 12. Database Indexing

Finding out what the users are currently running


Using this recipe, we will get all the current running SQL commands from the PostgreSQL instance.

Getting ready

In the previous recipe, we discussed how to get all the active sessions information, and now we are going to get all the SQL statements that the active sessions are executing.

How to do it...

  1. Initiate pgbench as aforementioned.

  2. Connect to the PostgreSQL database as either a superuser or database owner and execute the following SQL statement:

            $ psql -h localhost -U postgres 
            postgres=# SELECT
              datname, 
              usename, 
              application_name, 
              now()-backend_start AS "Session duration", 
              pid, 
              query 
            FROM 
              pg_stat_activity 
            WHERE 
              state='active'; 
            -[ RECORD 1 ]----+-------------------------------
            datname          | postgres 
            usename          | postgres...
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