pg_json_bench

pg_json_bench

The goal of this project is to help to compare how different data types and indexes behaves with inserts and queries with json data.

After running the tests, pg_json_bench publishes the result to prometheus gateway and it is possible see the result on the prepared grafana dashboards.

Example of a dashboard generated by pg_json_bench

Presentations

• Postgres Ibiza 2023: Leveraging the Power of JSON JSONB Fields
• PGConf.EU 2023: Lightning - TEXT is faster than JSON

Running

Spin up docker compose with monitoring stack

docker compose up -d

Prepare the data

mkdir ./data
wget https://raw.githubusercontent.com/algolia/datasets/master/movies/records.json -O ./data/records.json

Prepare the schema

psql -c "create database test;"
psql -d test < ./main.sql

Build

go build -o pg_json_bench

Run Benchmark Example:

DBCONN="dbname=test sslmode=disable" ./pg_json_bench query count_score_over_7 btree_idx_score,gin_idx,gin_idx_path

On the output the link for the metrics will be displayed, maybe you need to refresh. Grafana user and password is admin

Available commands

insert

Example:

./pg_json_bench insert <comma separated list of tables to test>

query

Example:

./pg_json_bench query <query> <comma separated list of tables to test>

Available query options:

• select_all
• score_over_7
• count_score_over_7
• count_year_2000_at_gt
• count_year_2000_eq

Tables

Available options:

• text
• json
• jsonb
• btree_idx_score
• gin_idx
• gin_idx_path

Note that the actual table name is prefixed with tbl_, so when text is passed as a parameter the table tbl_text will be used.