# ubuntu create postgres database

sudo su - postgres
psql
create database mspt_db;
create user mstp_user with encrypted password 'mstp_access';
grant all privileges on database mspt_db to mstp_user;


# Postgres Essentials
sudo su postgres || sudo –i –u postgres psql
psql
\l                          List all databases
\dt *.                      List all tables and schemas
\c <databas>;               Connect to database
\l+
\conninfo                   Current database connection info
\du                         list all users
create database <bd name>;
create user <username> with [encrypted | SUPERUSER] password <password>;
grand all priviledges on database <database> to <username>;
REINDEX [ ( VERBOSE ) ] { INDEX | TABLE | SCHEMA | DATABASE | SYSTEM } <name>;

**maintanace** without table locking
connect to every database and run .:$ VACUUM;

**maintanace** with table locking
1. REINDEX SYSTEM <database name>;
2. VACUUM FULL <table name>, REINDEX TABLE <table name>; for every data table (non system table)

**backupa and restore**
pg_dump dbname > dumpfile                                     Backuup
pg_dump -h host1 dbname | psql -h host2 dbname                             Dump database from one server to another
psql dbname < dumpfile || psql --set ON_ERROR_STOP=on dbname < dumpfile  [--single-transaction]           Restore
pg_dumpall > dumpfile         Dump all databases at once
psql -f dumpfile postgres     Restore databases dumpled with pd_dumpall
pg_dump dbname | gzip > filename.gz           handling large files
gunzip -c filename.gz | psql dbname || cat filename.gz | gunzip | psql dbname       to restore large files
pg_dump dbname | split -b 1m - filename    split files to accepable size e.b 1mb
cat filename* | psql dbname     restore split files