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Update SQL statements in docs for Synapse Admins (#12536)
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Dirk Klimpel
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changelog.d/12536.doc
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changelog.d/12536.doc
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Update SQL statements and replace use of old table `user_stats_historical` in docs for Synapse Admins.
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@ -1,7 +1,10 @@
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## Some useful SQL queries for Synapse Admins
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## Size of full matrix db
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`SELECT pg_size_pretty( pg_database_size( 'matrix' ) );`
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```sql
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SELECT pg_size_pretty( pg_database_size( 'matrix' ) );
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```
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### Result example:
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```
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pg_size_pretty
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@ -9,39 +12,19 @@ pg_size_pretty
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6420 MB
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(1 row)
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```
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## Show top 20 larger rooms by state events count
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```sql
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SELECT r.name, s.room_id, s.current_state_events
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FROM room_stats_current s
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LEFT JOIN room_stats_state r USING (room_id)
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ORDER BY current_state_events DESC
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LIMIT 20;
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```
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and by state_group_events count:
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```sql
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SELECT rss.name, s.room_id, count(s.room_id) FROM state_groups_state s
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LEFT JOIN room_stats_state rss USING (room_id)
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GROUP BY s.room_id, rss.name
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ORDER BY count(s.room_id) DESC
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LIMIT 20;
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```
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plus same, but with join removed for performance reasons:
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```sql
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SELECT s.room_id, count(s.room_id) FROM state_groups_state s
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GROUP BY s.room_id
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ORDER BY count(s.room_id) DESC
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LIMIT 20;
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```
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## Show top 20 larger tables by row count
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```sql
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SELECT relname, n_live_tup as rows
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SELECT relname, n_live_tup AS "rows"
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FROM pg_stat_user_tables
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ORDER BY n_live_tup DESC
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LIMIT 20;
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```
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This query is quick, but may be very approximate, for exact number of rows use `SELECT COUNT(*) FROM <table_name>`.
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This query is quick, but may be very approximate, for exact number of rows use:
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```sql
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SELECT COUNT(*) FROM <table_name>;
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```
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### Result example:
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```
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state_groups_state - 161687170
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@ -66,46 +49,19 @@ device_lists_stream - 326903
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user_directory_search - 316433
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```
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## Show top 20 rooms by new events count in last 1 day:
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```sql
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SELECT e.room_id, r.name, COUNT(e.event_id) cnt FROM events e
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LEFT JOIN room_stats_state r USING (room_id)
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WHERE e.origin_server_ts >= DATE_PART('epoch', NOW() - INTERVAL '1 day') * 1000 GROUP BY e.room_id, r.name ORDER BY cnt DESC LIMIT 20;
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```
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## Show top 20 users on homeserver by sent events (messages) at last month:
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```sql
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SELECT user_id, SUM(total_events)
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FROM user_stats_historical
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WHERE TO_TIMESTAMP(end_ts/1000) AT TIME ZONE 'UTC' > date_trunc('day', now() - interval '1 month')
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GROUP BY user_id
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ORDER BY SUM(total_events) DESC
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LIMIT 20;
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```
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## Show last 100 messages from needed user, with room names:
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```sql
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SELECT e.room_id, r.name, e.event_id, e.type, e.content, j.json FROM events e
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LEFT JOIN event_json j USING (room_id)
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LEFT JOIN room_stats_state r USING (room_id)
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WHERE sender = '@LOGIN:example.com'
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AND e.type = 'm.room.message'
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ORDER BY stream_ordering DESC
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LIMIT 100;
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```
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## Show top 20 larger tables by storage size
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```sql
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SELECT nspname || '.' || relname AS "relation",
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pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
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FROM pg_class C
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LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
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pg_size_pretty(pg_total_relation_size(c.oid)) AS "total_size"
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FROM pg_class c
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LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
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WHERE nspname NOT IN ('pg_catalog', 'information_schema')
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AND C.relkind <> 'i'
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AND c.relkind <> 'i'
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AND nspname !~ '^pg_toast'
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ORDER BY pg_total_relation_size(C.oid) DESC
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ORDER BY pg_total_relation_size(c.oid) DESC
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LIMIT 20;
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```
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### Result example:
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```
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public.state_groups_state - 27 GB
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@ -130,8 +86,93 @@ public.device_lists_remote_cache - 124 MB
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public.state_group_edges - 122 MB
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```
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## Show top 20 larger rooms by state events count
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You get the same information when you use the
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[admin API](../../admin_api/rooms.md#list-room-api)
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and set parameter `order_by=state_events`.
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```sql
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SELECT r.name, s.room_id, s.current_state_events
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FROM room_stats_current s
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LEFT JOIN room_stats_state r USING (room_id)
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ORDER BY current_state_events DESC
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LIMIT 20;
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```
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and by state_group_events count:
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```sql
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SELECT rss.name, s.room_id, COUNT(s.room_id)
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FROM state_groups_state s
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LEFT JOIN room_stats_state rss USING (room_id)
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GROUP BY s.room_id, rss.name
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ORDER BY COUNT(s.room_id) DESC
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LIMIT 20;
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```
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plus same, but with join removed for performance reasons:
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```sql
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SELECT s.room_id, COUNT(s.room_id)
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FROM state_groups_state s
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GROUP BY s.room_id
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ORDER BY COUNT(s.room_id) DESC
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LIMIT 20;
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```
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## Show top 20 rooms by new events count in last 1 day:
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```sql
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SELECT e.room_id, r.name, COUNT(e.event_id) cnt
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FROM events e
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LEFT JOIN room_stats_state r USING (room_id)
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WHERE e.origin_server_ts >= DATE_PART('epoch', NOW() - INTERVAL '1 day') * 1000
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GROUP BY e.room_id, r.name
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ORDER BY cnt DESC
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LIMIT 20;
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```
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## Show top 20 users on homeserver by sent events (messages) at last month:
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Caution. This query does not use any indexes, can be slow and create load on the database.
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```sql
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SELECT COUNT(*), sender
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FROM events
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WHERE (type = 'm.room.encrypted' OR type = 'm.room.message')
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AND origin_server_ts >= DATE_PART('epoch', NOW() - INTERVAL '1 month') * 1000
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GROUP BY sender
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ORDER BY COUNT(*) DESC
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LIMIT 20;
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```
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## Show last 100 messages from needed user, with room names:
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```sql
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SELECT e.room_id, r.name, e.event_id, e.type, e.content, j.json
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FROM events e
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LEFT JOIN event_json j USING (room_id)
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LEFT JOIN room_stats_state r USING (room_id)
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WHERE sender = '@LOGIN:example.com'
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AND e.type = 'm.room.message'
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ORDER BY stream_ordering DESC
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LIMIT 100;
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```
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## Show rooms with names, sorted by events in this rooms
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`echo "select event_json.room_id,room_stats_state.name from event_json,room_stats_state where room_stats_state.room_id=event_json.room_id" | psql synapse | sort | uniq -c | sort -n`
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**Sort and order with bash**
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```bash
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echo "SELECT event_json.room_id, room_stats_state.name FROM event_json, room_stats_state \
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WHERE room_stats_state.room_id = event_json.room_id" | psql -d synapse -h localhost -U synapse_user -t \
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| sort | uniq -c | sort -n
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```
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Documentation for `psql` command line parameters: https://www.postgresql.org/docs/current/app-psql.html
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**Sort and order with SQL**
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```sql
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SELECT COUNT(*), event_json.room_id, room_stats_state.name
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FROM event_json, room_stats_state
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WHERE room_stats_state.room_id = event_json.room_id
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GROUP BY event_json.room_id, room_stats_state.name
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ORDER BY COUNT(*) DESC
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LIMIT 50;
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```
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### Result example:
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```
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9459 !FPUfgzXYWTKgIrwKxW:matrix.org | This Week in Matrix
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@ -145,12 +186,22 @@ public.state_group_edges - 122 MB
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```
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## Lookup room state info by list of room_id
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You get the same information when you use the
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[admin API](../../admin_api/rooms.md#room-details-api).
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```sql
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SELECT rss.room_id, rss.name, rss.canonical_alias, rss.topic, rss.encryption, rsc.joined_members, rsc.local_users_in_room, rss.join_rules
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FROM room_stats_state rss
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LEFT JOIN room_stats_current rsc USING (room_id)
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WHERE room_id IN (WHERE room_id IN (
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SELECT rss.room_id, rss.name, rss.canonical_alias, rss.topic, rss.encryption,
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rsc.joined_members, rsc.local_users_in_room, rss.join_rules
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FROM room_stats_state rss
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LEFT JOIN room_stats_current rsc USING (room_id)
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WHERE room_id IN ( WHERE room_id IN (
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'!OGEhHVWSdvArJzumhm:matrix.org',
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'!YTvKGNlinIzlkMTVRl:matrix.org'
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)
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);
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```
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## Show users and devices that have not been online for a while
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```sql
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SELECT user_id, device_id, user_agent, TO_TIMESTAMP(last_seen / 1000) AS "last_seen"
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FROM devices
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WHERE last_seen < DATE_PART('epoch', NOW() - INTERVAL '3 month') * 1000;
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```
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