feat: suggestion of more optimum settings for postgres #23

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gilescope wants to merge 2 commits into main from giles-postgres-config

CHANGELOG.md

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     ## 🚀 Features
+    - Optimise postgres config
     - Cardano's ipc socket file is now stored in a docker volume so when stale can be recreated on all OSes.
     - `cardano-cli.sh`, `midnight-node.sh` and `midnight-shell.sh` execute within the running container.
     - Switch networks by altering CFG_PRESET only
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compose-partner-chains.yml

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           - POSTGRES_USER=${POSTGRES_USER}
         volumes:
           - postgres-data:/var/lib/postgresql/data
+          - ./postgresql.conf:/etc/postgresql.conf
+        command: postgres -c config_file=/etc/postgresql.conf -c listen_addresses='*'
         ports:
           - "${POSTGRES_PORT}:${POSTGRES_PORT}"
         healthcheck:
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postgresql.conf

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+    # Tuned from https://pgtune.leopard.in.ua/?dbVersion=15&osType=linux&dbType=oltp&cpuNum=1&totalMemory=1&totalMemoryUnit=GB&connectionNum=20&hdType=ssd
+    # (Please regenerate when altering postgres versions.)
+    #
+    # DB Version: 15
+    # OS Type: linux
+    # DB Type: oltp
+    # Total Memory (RAM): 3 GB
+    # CPUs num: 1
+    # Connections num: 20
+    # Data Storage: ssd
+    max_connections = 20
+    shared_buffers = 768MB
+    effective_cache_size = 2304MB
+    maintenance_work_mem = 192MB
+    checkpoint_completion_target = 0.9
+    wal_buffers = 16MB
+    default_statistics_target = 100
+    random_page_cost = 1.1
+    effective_io_concurrency = 200
+    work_mem = 28086kB
+    huge_pages = off
+    min_wal_size = 2GB
+    max_wal_size = 8GB

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