Postgresql

Connect

su - postgres
psql -v HISTFILE=/dev/null

Basic

-- list database
\l
-- connect to db
\c dbname

Dump

pg_dump dbname > dbname.dump.sql

Restore

psql dbname < dbname.dump.sql

Get sizes

SELECT pg_size_pretty( pg_database_size('dbname') );
SELECT pg_size_pretty( pg_total_relation_size('tablename') );

etc

SELECT name,setting FROM pg_settings WHERE name ~ 'autova|vacuum';
                name                 |  setting  
-------------------------------------+-----------
 autovacuum                          | on
 autovacuum_analyze_scale_factor     | 0.1
 autovacuum_analyze_threshold        | 50
 autovacuum_freeze_max_age           | 200000000
 autovacuum_max_workers              | 3
 autovacuum_multixact_freeze_max_age | 400000000
 autovacuum_naptime                  | 60
 autovacuum_vacuum_cost_delay        | 20
 autovacuum_vacuum_cost_limit        | -1
 autovacuum_vacuum_scale_factor      | 0.2
 autovacuum_vacuum_threshold         | 50
 autovacuum_work_mem                 | -1
 log_autovacuum_min_duration         | -1
 vacuum_cost_delay                   | 0
 vacuum_cost_limit                   | 200
 vacuum_cost_page_dirty              | 20
 vacuum_cost_page_hit                | 1
 vacuum_cost_page_miss               | 10
 vacuum_defer_cleanup_age            | 0
 vacuum_freeze_min_age               | 50000000
 vacuum_freeze_table_age             | 150000000
 vacuum_multixact_freeze_min_age     | 5000000
 vacuum_multixact_freeze_table_age   | 150000000
(23 rows)