node.start()

Finally our temporary cluster is able to process queries. There are four ways to run them:

*`node.psql(database, query)` - runs query via`psql` command and returns tuple`(error code, stdout, stderr)`

*`node.safe_psql(database, query)` - same as`psql()` except that it returns only`stdout`. If an error occures during the execution, an exception will be thrown.

*`node.execute(database, query, username=None, commit=True)` - connects to postgresql server using`psycopg2` or`pg8000` library (depends on which is installed in your system) and returns two-dimensional array with data.

*`node.connect(database='postgres')` - returns connection wrapper (`NodeConnection`) capable of running several queries within a single transaction.

Finally, our temporary cluster is able to process queries. There are four ways to run them:

| Command| Description|

|-------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------|

|`node.psql(database, query)`| Runs query via`psql` command and returns tuple`(error code, stdout, stderr)`.|

|`node.safe_psql(database, query)`| Same as`psql()` except that it returns only`stdout`. If an error occures during the execution, an exception will be thrown.|

|`node.execute(database, query, username=None, commit=True)`| Connects to PostgreSQL using`psycopg2` or`pg8000` (depends on which one is installed in your system) and returns two-dimensional array with data.|

|`node.connect(database='postgres')`| Returns connection wrapper (`NodeConnection`) capable of running several queries within a single transaction.|

The last one is the most powerful: you can use`begin(isolation_level)`,`commit()` and`rollback()`: