pg_query_analyser – PostgreSQL Slow Query Log parser¶

Overview¶

pg_query_analyser is a C++ clone of the PgFouine log analyser.

Processing logs with millions of lines only takes a few minutes with this parser while PgFouine chokes long before that.

Example output¶

The normal overview:

http://wolph.github.com/pg_query_analyser/images/screenshot.png

The overview with the examples expanded:

http://wolph.github.com/pg_query_analyser/images/screenshot1.png

Requirements¶

Ubuntu (tested with 13.10):

apt-get install qt4-dev-tools

Ubuntu (tested with 16.04.2 LTS)

apt-get install qt4-dev-tools qt4-qmake libqt4-dev

Install¶

qmake
make
make test
sudo make install

Usage¶

Set Postgres to use this log_line_prefix:

log_line_prefix = '%t [%p]: [%l-1] host=%h,user=%u,db=%d,tx=%x,vtx=%v '

After that we can start parsing data.

From stdin:

cat /var/log/postgresql/postgresql.log | head -n 100000 | ./pg_query_analyser -i -

From file:

./pg_query_analyser --input-file=/var/log/postgresql/postgresql.log

For a full build+analyze on Ubuntu:

cd examples
fab -H <remote-ubuntu-postgres-server> build log_and_analyse

Help¶

# ./pg_query_analyser -h
Usage: ./pg_query_analyser [flags]
Options:
  -h, --help=[false]
  -u, --users=[]
  -v, --verbose=[false]
  -i, --input-file=[/var/log/postgresql/postgresql-9.1-main.log]
  -d, --databases=[]
  -t, --query-types=[SELECT,UPDATE,INSERT,DELETE]
  -o, --output-file=[report.html]
  --top=[20]