PostgreSQL useful tips

I am posting some of the PostgreSQL commands which I use frequently.

Create a new database name testdb

# createdb <dbname>
e.g:


# createdb testdb

Remove a PostgreSQL database
# dropdb <dbname>
e.g:

# dropdb testdb

Backing up a PostgreSQL database


# su - postgres


# pg_dump --blob -Fc testdb -f /var/lib/pgsql/backups/testdb_backup

Restoring PostgreSQL database from back up dump


# pg_restore --dbname=testdb /var/lib/pgsql/backups/testdb_backup

Writing query output to a CSV file:


# \o 'tmp/logs/query_out_dump.csv'

After this operation all the query results will be stored in a CSV file.
Using console again for query output:


# \o

For more on pg_dump and pg_restore pl. check the documentation

Stanford DB class

Along with my AI class course,  I have also started DB class (Oct-Dec session) from Standford online courses series. Actually, learning DB was long due and this seems to be perfect opportunity. In my professional life I write SQL queries and sometime modify the database schema but that is all job requirement, going through full course content again (after my degree) is really an opportunity and I don’t want to miss it.  Course instructor for this class is Jennifer Widom and I am really liking her teaching style so I am bit excited. Well, I have almost completed first part and some of the points covered in this part are:

 

  • DBMS features
  • Key concepts like Data model, schema, DDL, DML
  • Key people like Database designer, Administrator, developer
  • Relational model XML data – DTD, XSD — This covered really well along with XML validation
  • Relational algebra
  • Intro to SQL

 

Have to finish some assignment by this week end. It’s going to be packed weekend with lot of assignments.

 

Will come back with more..

 

Thanks