edib

To use the most modern version of Postgres software we need to add postgresql repository. Edit /etc/apt/sources.list or create /etc/apt/sources.list.d/pgdg.list and add there a line: deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main Then import the repository signing key, and update the package lists:

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update

Install a new version of PostgreSQL server.

Once the Debian upgrade finished, I used dpkg-query -l postgresql* to check which versions of postgres I have installed.

edib

-- Order by one indexed column (FAST)
newsdesk_production=# explain analyze select * from pressreleases order by published_at DESC limit 100;
                                                                                   QUERY PLAN                                                                                    
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Limit  (cost=0.00..249.91 rows=100 width=1207) (actual time=26.070..716.453 rows=100 loops=1)
   ->  Index Scan Backward using pressreleases_published_at_index on pressreleases  (cost=0.00..964766.62 rows=386042 width=1207) (actual time=26.067..716.343 rows=100 loops=1)
 Total runtime: 716.709 ms
(3 rows)

- Order by two separately indexed columns (SLOW)

edib

-- show running queries (pre 9.2)
SELECT procpid, age(query_start, clock_timestamp()), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(query_start, clock_timestamp()), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

edib

# Sample haproxy postgresql master check
#
# haproxy listen: 5431
# pg, instance #1 listen: 5432 (master node)
# pg, instance #2 listen: 5433 (replica node)
# external failover, promoting replica to master in case of failure
# passwordless auth for user web
# template1 database is accessible by user web
#
# haproxy will pass connection to postgresql master node:

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--- PSQL queries which also duplicated from https://github.com/anvk/AwesomePSQLList/blob/master/README.md
--- some of them taken from https://www.slideshare.net/alexeylesovsky/deep-dive-into-postgresql-statistics-54594192

-- I'm not an expert in PSQL. Just a developer who is trying to accumulate useful stat queries which could potentially explain problems in your Postgres DB.

------------
-- Basics --
------------

-- Get indexes of tables

edib

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Your app name',
      home: Scaffold(

edib

# Use envFrom to load Secrets and ConfigMaps into environment variables

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: mans-not-hot
  labels:
    app: mans-not-hot
spec:
  replicas: 1

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# See https://wiki.postgresql.org/wiki/Using_pg_upgrade_on_Ubuntu/Debian for more information and warning!

# Check first
/usr/lib/postgresql/11/bin/pg_upgrade \
   -b /usr/lib/postgresql/9.6/bin \
   -B /usr/lib/postgresql/11/bin \
   -d /var/lib/postgresql/9.6/main \
   -D /var/lib/postgresql/11/main \
   -o ' -c config_file=/etc/postgresql/9.6/main/postgresql.conf' \
   -O ' -c config_file=/etc/postgresql/11/main/postgresql.conf' \

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## This will be fixed by

find /var/www -type d -exec chmod 755 {} \;
find /var/www -type f -exec chmod 644 {} \;

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Bu yazıyı okumadan önce, ssh ayarlarınızı yaptığınıza emin olun
Bu yazı PostgreSQL 11 ve PgBackRest 2.15 için yazılmıştır

Kurulum

Master ayarları

Öncelikle aşağıdaki komut ile pgbackrest kuralım:

sudo apt-get install pgbackrest -y