Merge branch 'db_indexes' into dev

server/.gitignore

@@ -2,3 +2,4 @@
 .env
 .idea
 env_setup.sh
+query_testing/*.json

server/migrations/2020-01-11-012452_add_indexes/down.sql

@@ -0,0 +1,16 @@
+drop index idx_post_creator;
+drop index idx_post_community;
+
+drop index idx_post_like_post;
+drop index idx_post_like_user;
+
+drop index idx_comment_creator;
+drop index idx_comment_parent;
+drop index idx_comment_post;
+
+drop index idx_comment_like_comment;
+drop index idx_comment_like_user;
+drop index idx_comment_like_post;
+
+drop index idx_community_creator;
+drop index idx_community_category;

server/migrations/2020-01-11-012452_add_indexes/up.sql

@@ -0,0 +1,17 @@
+-- Go through all the tables joins, optimize every view, CTE, etc.
+create index idx_post_creator on post (creator_id);
+create index idx_post_community on post (community_id);
+
+create index idx_post_like_post on post_like (post_id);
+create index idx_post_like_user on post_like (user_id);
+
+create index idx_comment_creator on comment (creator_id);
+create index idx_comment_parent on comment (parent_id);
+create index idx_comment_post on comment (post_id);
+
+create index idx_comment_like_comment on comment_like (comment_id);
+create index idx_comment_like_user on comment_like (user_id);
+create index idx_comment_like_post on comment_like (post_id);
+
+create index idx_community_creator on community (creator_id);
+create index idx_community_category on community (category_id);

server/query_testing/generate_explain_reports.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+# Do the views first
+
+echo "explain (analyze, format json) select * from user_view" > explain.sql
+psql -qAt -U lemmy -f explain.sql > user_view.json
+
+echo "explain (analyze, format json) select * from post_view where user_id is null order by hot_rank desc" > explain.sql
+psql -qAt -U lemmy -f explain.sql > post_view.json
+
+echo "explain (analyze, format json) select * from comment_view where user_id is null" > explain.sql
+psql -qAt -U lemmy -f explain.sql > comment_view.json
+
+echo "explain (analyze, format json) select * from community_view where user_id is null order by hot_rank desc" > explain.sql
+psql -qAt -U lemmy -f explain.sql > community_view.json
+
+echo "explain (analyze, format json) select * from site_view limit 1" > explain.sql
+psql -qAt -U lemmy -f explain.sql > site_view.json
+
+grep "Execution Time" *.json
+
+rm explain.sql