Add Enable Logging Of Database Activity as a Postgres til

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1176 TILs and counting..._
+_1177 TILs and counting..._
 
 ---
 
@@ -571,6 +571,7 @@ _1176 TILs and counting..._
 - [Dump And Restore A Database](postgres/dump-and-restore-a-database.md)
 - [Duplicate A Local Database](postgres/duplicate-a-local-database.md)
 - [Edit Existing Functions](postgres/edit-existing-functions.md)
+- [Enable Logging Of Database Activity](postgres/enable-logging-of-database-activity.md)
 - [Escaping A Quote In A String](postgres/escaping-a-quote-in-a-string.md)
 - [Escaping String Literals With Dollar Quoting](postgres/escaping-string-literals-with-dollar-quoting.md)
 - [Export Query Results To A CSV](postgres/export-query-results-to-a-csv.md)

postgres/enable-logging-of-database-activity.md

@@ -0,0 +1,43 @@
+# Enable Logging Of Database Activity
+
+For logging to be enabled for a PostgreSQL server, it needs to be properly
+configured. This means ensuring the `logging_collector` option is on. By
+default I believe it is `off`.
+
+This is configured in the `postgresql.conf` file and requires a server restart.
+
+First, to find where the conf file is. I can answer that question in a `psql`
+session.
+
+```sql
+> show config_file;
+                             config_file
+---------------------------------------------------------------------
+ /Users/jbranchaud/.asdf/installs/postgres/12.3/data/postgresql.conf
+(1 row)
+```
+
+Now, I can open up that file and search for the line that has
+`logging_collector`. I uncomment that line and change `off` to `on`.
+
+```
+# This is used when logging to stderr:
+logging_collector = on 		# Enable capturing of stderr and csvlog
+					# into log files. Required to be on for
+					# csvlogs.
+					# (change requires restart)
+```
+
+This requires a restart of the Postgres server.
+
+```bash
+$ ~/.asdf/installs/postgres/12.3/bin/pg_ctl -D ~/.asdf/installs/postgres/12.3/data restart
+waiting for server to shut down.... done
+server stopped
+waiting for server to start...
+ done
+server started
+```
+
+I can now adjust any further logging-related configurations on a server or
+session basis. And then view those logs.