From 8820e7a03476034417e4005f3a723bf059c99f2f Mon Sep 17 00:00:00 2001
From: Vitaliy Kukharik <37010174+vitabaks@users.noreply.github.com>
Date: Tue, 26 Dec 2023 16:19:12 +0300
Subject: [PATCH] Optimize PostgreSQL parameters for SSD storage (#536)

---
 vars/main.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vars/main.yml b/vars/main.yml
index 57d6a9a9e..581e32db6 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -202,8 +202,8 @@ postgresql_parameters:
   - { option: "wal_buffers", value: "32MB" }
   - { option: "default_statistics_target", value: "1000" }
   - { option: "seq_page_cost", value: "1" }
-  - { option: "random_page_cost", value: "4" }  # "1.1" for SSD storage. Also, if your databases fits in shared_buffers
-  - { option: "effective_io_concurrency", value: "2" }  # "200" for SSD storage
+  - { option: "random_page_cost", value: "1.1" }  # or "4" for HDDs with slower random access
+  - { option: "effective_io_concurrency", value: "200" }  # or "2" for traditional HDDs with lower I/O parallelism
   - { option: "synchronous_commit", value: "on" }  # or 'off' if you can you lose single transactions in case of a crash
   - { option: "autovacuum", value: "on" }  # never turn off the autovacuum!
   - { option: "autovacuum_max_workers", value: "5" }