Node database
=============

Default in-memory database
--------------------------

By default nodes store their data in an H2 database.

You can connect directly to a running node's database to see its stored states, transactions and attachments as
follows:

* Download the `h2 platform-independent zip <http://www.h2database.com/html/download.html>`_, unzip the zip, and
  navigate in a terminal window to the unzipped folder
* Change directories to the bin folder:

  ``cd h2/bin``

* Run the following command to open the h2 web console in a web browser tab:

  * Unix: ``sh h2.sh``
  * Windows: ``h2.bat``

* Find the node's JDBC connection string. Each node outputs its connection string in the terminal
  window as it starts up. In a terminal window where a node is running, look for the following string:

  ``Database connection URL is              : jdbc:h2:tcp://10.18.0.150:56736/node``

* Paste this string into the JDBC URL field and click ``Connect``, using the default username and password.

You will be presented with a web interface that shows the contents of your node's storage and vault, and provides an
interface for you to query them using SQL.

Standalone database
-------------------

To run a node against a remote database modify node JDBC connection properties in `dataSourceProperties` entry
and Hibernate properties in `database` entry - see `:ref:`dataSourceProperties`.

SQL Azure and SQL Server
````````````````````````
Corda supports SQL Server 2017 (14.0.3006.16) and Azure SQL (12.0.2000.8).
The minimum transaction isolation level ``database.transactionIsolationLevel`` is 'readCommitted'.
The property ``database.schema`` is optional.
Corda ships with Microsoft JDBC Driver 6.2 for SQLServer out-of-the-box.

Example node configuration for SQL Azure:

.. sourcecode:: none

dataSourceProperties {
    dataSourceClassName = "com.microsoft.sqlserver.jdbc.SQLServerDataSource"
    dataSourceProperties.dataSource.url = "jdbc:sqlserver://[DATABASE_SERVER].database.windows.net:1433;databaseName=[DATABASE];
        encrypt=true;trustServerCertificate=false;hostNameInCertificate=*.database.windows.net;loginTimeout=30"
    dataSourceProperties.dataSource.user = [USER]
    dataSourceProperties.dataSource.password = [PASSWORD]
}
database {
    transactionIsolationLevel = "readCommitted"
    schema = [SCHEMA]
}