corda/docs/source/node-database.rst

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

.. contents::

Configuring the node database
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

H2
--
By default, nodes store their data in an H2 database. See :doc:`node-database-access-h2`.

Nodes can also be configured to use PostgreSQL and SQL Server. However, these are experimental community contributions.
The Corda continuous integration pipeline does not run unit tests or integration tests of these databases.

PostgreSQL
----------
Nodes can also be configured to use PostgreSQL 9.6, using PostgreSQL JDBC Driver 42.1.4. Here is an example node
configuration for PostgreSQL:

.. sourcecode:: groovy

    dataSourceProperties = {
        dataSourceClassName = "org.postgresql.ds.PGSimpleDataSource"
        dataSource.url = "jdbc:postgresql://[HOST]:[PORT]/[DATABASE]"
        dataSource.user = [USER]
        dataSource.password = [PASSWORD]
    }
    database = {
        transactionIsolationLevel = READ_COMMITTED
    }

Note that:

* Database schema name can be set in JDBC URL string e.g. *currentSchema=my_schema*
* Database schema name must either match the ``dataSource.user`` value to end up
  on the standard schema search path according to the
  `PostgreSQL documentation <https://www.postgresql.org/docs/9.3/static/ddl-schemas.html#DDL-SCHEMAS-PATH>`_, or
  the schema search path must be set explicitly for the user.
* If your PostgresSQL database is hosting multiple schema instances (using the JDBC URL currentSchema=my_schema)
  for different Corda nodes, you will need to create a *hibernate_sequence* sequence object manually for each subsequent schema added after the first instance.
  Corda doesn't provision Hibernate with a schema namespace setting and a sequence object may be not created.
  Run the DDL statement and replace *my_schema* with your schema namespace:

  .. sourcecode:: groovy

    CREATE SEQUENCE my_schema.hibernate_sequence INCREMENT BY 1 MINVALUE 1 MAXVALUE 9223372036854775807 START 8 CACHE 1 NO CYCLE;

SQLServer
---------
Nodes also have untested support for Microsoft SQL Server 2017, using Microsoft JDBC Driver 6.2 for SQL Server. Here is
an example node configuration for SQLServer:

.. sourcecode:: groovy

    dataSourceProperties = {
        dataSourceClassName = "com.microsoft.sqlserver.jdbc.SQLServerDataSource"
        dataSource.url = "jdbc:sqlserver://[HOST]:[PORT];databaseName=[DATABASE_NAME]"
        dataSource.user = [USER]
        dataSource.password = [PASSWORD]
    }
    database = {
        transactionIsolationLevel = READ_COMMITTED
    }
    jarDirs = ["[FULL_PATH]/sqljdbc_6.2/enu/"]

Note that:

* Ensure the directory referenced by jarDirs contains only one JDBC driver JAR file; by the default,
  sqljdbc_6.2/enu/contains two JDBC JAR files for different Java versions.

Node database tables
^^^^^^^^^^^^^^^^^^^^

By default, the node database has the following tables:

+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table name                  | Columns                                                                                                                                                                                                  |
+=============================+==========================================================================================================================================================================================================+
| DATABASECHANGELOG           | ID, AUTHOR, FILENAME, DATEEXECUTED, ORDEREXECUTED, EXECTYPE, MD5SUM, DESCRIPTION, COMMENTS, TAG, LIQUIBASE, CONTEXTS, LABELS, DEPLOYMENT_ID                                                              |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| DATABASECHANGELOGLOCK       | ID, LOCKED, LOCKGRANTED, LOCKEDBY                                                                                                                                                                        |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_ATTACHMENTS            | ATT_ID, CONTENT, FILENAME, INSERTION_DATE, UPLOADER                                                                                                                                                      |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_ATTACHMENTS_CONTRACTS  | ATT_ID, CONTRACT_CLASS_NAME                                                                                                                                                                              |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_ATTACHMENTS_SIGNERS    | ATT_ID, SIGNER                                                                                                                                                                                           |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_CHECKPOINTS            | CHECKPOINT_ID, CHECKPOINT_VALUE                                                                                                                                                                          |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_CONTRACT_UPGRADES      | STATE_REF, CONTRACT_CLASS_NAME                                                                                                                                                                           |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_IDENTITIES             | PK_HASH, IDENTITY_VALUE                                                                                                                                                                                  |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_INFOS                  | NODE_INFO_ID, NODE_INFO_HASH, PLATFORM_VERSION, SERIAL                                                                                                                                                   |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_INFO_HOSTS             | HOST_NAME, PORT, NODE_INFO_ID, HOSTS_ID                                                                                                                                                                  |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_INFO_PARTY_CERT        | PARTY_NAME, ISMAIN, OWNING_KEY_HASH, PARTY_CERT_BINARY                                                                                                                                                   |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_LINK_NODEINFO_PARTY    | NODE_INFO_ID, PARTY_NAME                                                                                                                                                                                 |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_MESSAGE_IDS            | MESSAGE_ID, INSERTION_TIME, SENDER, SEQUENCE_NUMBER                                                                                                                                                      |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_NAMED_IDENTITIES       | NAME, PK_HASH                                                                                                                                                                                            |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_NETWORK_PARAMETERS     | HASH, EPOCH, PARAMETERS_BYTES, SIGNATURE_BYTES, CERT, PARENT_CERT_PATH                                                                                                                                   |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_OUR_KEY_PAIRS          | PUBLIC_KEY_HASH, PRIVATE_KEY, PUBLIC_KEY                                                                                                                                                                 |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_PROPERTIES             | PROPERTY_KEY, PROPERTY_VALUE                                                                                                                                                                             |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_SCHEDULED_STATES       | OUTPUT_INDEX, TRANSACTION_ID, SCHEDULED_AT                                                                                                                                                               |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NODE_TRANSACTIONS           | TX_ID, TRANSACTION_VALUE, STATE_MACHINE_RUN_ID                                                                                                                                                           |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| PK_HASH_TO_EXT_ID_MAP       | ID, EXTERNAL_ID, PUBLIC_KEY_HASH                                                                                                                                                                         |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| STATE_PARTY                 | OUTPUT_INDEX, TRANSACTION_ID, ID, PUBLIC_KEY_HASH, X500_NAME                                                                                                                                             |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| VAULT_FUNGIBLE_STATES       | OUTPUT_INDEX, TRANSACTION_ID, ISSUER_NAME, ISSUER_REF, OWNER_NAME, QUANTITY                                                                                                                              |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| VAULT_FUNGIBLE_STATES_PARTS | OUTPUT_INDEX, TRANSACTION_ID, PARTICIPANTS                                                                                                                                                               |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| VAULT_LINEAR_STATES         | OUTPUT_INDEX, TRANSACTION_ID, EXTERNAL_ID, UUID                                                                                                                                                          |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| VAULT_LINEAR_STATES_PARTS   | OUTPUT_INDEX, TRANSACTION_ID, PARTICIPANTS                                                                                                                                                               |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| VAULT_STATES                | OUTPUT_INDEX, TRANSACTION_ID, CONSUMED_TIMESTAMP, CONTRACT_STATE_CLASS_NAME, LOCK_ID, LOCK_TIMESTAMP, NOTARY_NAME, RECORDED_TIMESTAMP, STATE_STATUS, RELEVANCY_STATUS, CONSTRAINT_TYPE, CONSTRAINT_DATA  |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| VAULT_TRANSACTION_NOTES     | SEQ_NO, NOTE, TRANSACTION_ID                                                                                                                                                                             |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| V_PKEY_HASH_EX_ID_MAP       | ID, PUBLIC_KEY_HASH, TRANSACTION_ID, OUTPUT_INDEX, EXTERNAL_ID                                                                                                                                           |
+-----------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

For more details see: :doc:`node-database-tables`.

Database connection pool
^^^^^^^^^^^^^^^^^^^^^^^^

Corda uses `Hikari Pool <https://github.com/brettwooldridge/HikariCP>`_ for creating the connection pool.
To configure the connection pool any custom properties can be set in the `dataSourceProperties` section.

For example:

.. sourcecode:: groovy

    dataSourceProperties = {
        dataSourceClassName = "org.postgresql.ds.PGSimpleDataSource"
        ...
        maximumPoolSize = 10
        connectionTimeout = 50000
    }