Database tables

A Corda node database contains tables corresponding to the various services that the node provides. It also contains custom tables defined by the CorDapps that are installed on the node. Currently all these tables share the same database schema, but in a future release they will be isolated from each other.

Note

Unless specified otherwise the node tables are for internal use and can change between versions.

Some tables, especially the ones where the Ledger is maintained are append-only and the data will never change.

Warning

Manually adding, removing or updating any data should only be done with great care. Corda is a distributed ledger and modifying data could lead to unexpected behaviour and inconsistent views of the ledger.

Network map

Node Infos

These are tables that store the NodeInfo of other network participants. They are just a local cache that is kept in sync with the network map server. By calling rpc.clearNetworkMapCache() all these tables will be cleared and recreated from the network map server.

Read more here: The network map

_images/node_info_tables.png
NODE_INFOS Stores NodeInfo objects. The principal table.
NODE_INFO_ID Primary key
NODE_INFO_HASH Hash of the binary nodeInfo file
PLATFORM_VERSION Declared version of the participant node.
SERIAL Version of the NodeInfo
NODE_INFO_HOSTS Many-to-one addresses to node
HOSTS_ID Primary key
HOST_NAME Host name of the participant’s node
PORT Port
NODE_INFO_ID FK to NODE_INFOS
NODE_INFO_PARTY_CERT Legal identity for a network participant
PARTY_NAME The X500 name
OWNING_KEY_HASH The public key
ISMAIN If this is a main identity
PARTY_CERT_BINARY The certificate chain
NODE_LINK_NODEINFO_PARTY Many-to-Many link between the hosts and the legal identities
NODE_INFO_ID FK to Node_info
PARTY_NAME FK to NODE_INFO_PARTY_CERT

Node identities

The following two tables are used by the IdentityService and are created from the NodeInfos. They are append only tables used for persistent caching. They will also be cleared on rpc.clearNetworkMapCache(). Read more in API: Identity and Node services

NODE_IDENTITIES Maps public keys to identities
PK_HASH The public key.
IDENTITY_VALUE The certificate chain.
NODE_NAMED_IDENTITIES Maps the X500 name of a participant to a public key.
NAME The x500 name
PK_HASH The public key

Network parameters

Read more here: The network map. Each downloaded network parameters file will create an entry in this table. The historical network parameters are used when validating transactions, which makes this table logically part of the Ledger. It is an append only table and the size will be fairly small.

NODE_NETWORK_PARAMETERS Stores the downloaded network parameters.
HASH The hash of the downloaded file. Used as a primary key.
EPOCH The version of the parameters
PARAMETERS_BYTES The serialized bytes
SIGNATURE_BYTES The signature
CERT First signer certificate in the certificate chain.
PARENT_CERT_PATH Parent certificate path of signer.

Ledger

The ledger data is formed of transactions and attachments. In future versions this data will be encrypted using SGX. Read more in The ledger

Attachments

Read more in Using attachments and Node services

_images/attachments_tables.png
NODE_ATTACHMENTS Stores attachments
ATT_ID The hash of the content of the file.
CONTENT The binary content
FILENAME Not used at the moment.
INSERTION_DATE Date.
UPLOADER One of: p2p, app, rpc, unknown. Currently used for for determining if this attachment is safe to execute during transaction verification.
VERSION The version of the JAR file.
NODE_ATTACHMENTS_CONTRACTS Many-to-one contracts per attachment. Empty for non-contract attachments.
ATT_ID Foreign key
CONTRACT_CLASS_NAME The fully qualified contract class name. E.g.: net.corda.finance.contracts.asset.Cash
NODE_ATTACHMENTS_SIGNERS Many-to-one JAR signers of an attachment. Empty if not signed.
ATT_ID Foreign key
SIGNER Hex encoded public key of the JAR signer.

Transactions

These are all the transactions that the node has created or has ever downloaded as part of transaction resolution. This table can grow very large. It is an append-only table, and the data will never change. Read more in Node services - DBTransactionStorage This is the key ledger table used as a source of truth. In the future the content will be encrypted to preserve confidentiality.

NODE_TRANSACTIONS Corda transactions in a binary format
TX_ID The hash of the transaction. Primary key.
TRANSACTION_VALUE The binary representation of the transaction.
STATE_MACHINE_RUN_ID The flow id associated with this transaction.

Contract upgrades

Read more in Upgrading contracts

NODE_CONTRACT_UPGRADES Represents an authorisation to upgrade a state_ref to a contract.
STATE_REF The authorised state.
CONTRACT_CLASS_NAME The contract.

This table should be empty when no states are authorised for upgrade or after authorised states have been upgraded.

Scheduling

Read more in Event scheduling

NODE_SCHEDULED_STATES Contains scheduled states
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
SCHEDULED_AT Timestamp when this state will execute.

This table should be empty when no events are scheduled.

Storage of private keys

Read more in HSM support for legal identity keys These tables are a less secure alternative for storing keys to using an HSM (Hardware Security Module).

NODE_OUR_KEY_PAIRS Stores the anonymous identities
PUBLIC_KEY_HASH Primary key
PRIVATE_KEY Binary private key
PUBLIC_KEY Binary public key
PK_HASH_TO_EXT_ID_MAP Maps public keys to external ids. Mainly used by CorDapps that need to simulate accounts.
ID Primary key
EXTERNAL_ID External id
PUBLIC_KEY_HASH Public key hash

These tables should be append only.

Node state machine

Read more in Node services

NODE_CHECKPOINTS Stores the flow checkpoints.
CHECKPOINT_ID Primary key
CHECKPOINT_VALUE Serialized application stack.

This table will see the most intense read-write activity. Depending on the installed flows and the traffic on the node the I/O operations on this table will be the main bottleneck of the node performance. There will be an entry for every running flow. Draining the node means waiting for this table to become emtpy. Read more in: Upgrading CorDapps on a node.

NODE_MESSAGE_IDS Used for de-duplication of messages received by peers.
MESSAGE_ID Message id
INSERTION_TIME Insertion time
SENDER P2p sender
SEQUENCE_NUMBER Sequence number

The NodeJanitor is a background process that will clean up old entries from this table. The size should be fairly constant.

Key value store

NODE_PROPERTIES General key value store. Currently only used for the flow draining mode.
PROPERTY_KEY The key
PROPERTY_VALUE The value

Vault tables

Read more about the vault here Vault.

Note that the vault tables are guaranteed to remain backwards compatible and are safe to be used directly by third party applications.

VAULT_STATES Principal vault table.
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
CONSUMED_TIMESTAMP When the state was consumed.
CONTRACT_STATE_CLASS_NAME Contract class
LOCK_ID The soft lock id
LOCK_TIMESTAMP The soft lock timestamp
NOTARY_NAME The notary
RECORDED_TIMESTAMP Recorded timestamp
STATE_STATUS CONSUMED or UNCONSUMED
RELEVANCY_STATUS RELEVANT or NOT_RELEVANT
CONSTRAINT_TYPE The contract constraint.
CONSTRAINT_DATA The hash or the composite key depending on the CONSTRAINT_TYPE

The VAULT_STATES table contains an entry for every relevant state. This table records the status of states and allows CorDapps to soft lock states it intends to consume. Depending on the installed CorDapps this table can grow. For example when fungible states are used.

In case this table grows too large, the DBA can choose to archive old consumed states. The actual content of the states can be retrieved from the NODE_TRANSACTIONS table by deserializing the binary representation.

VAULT_TRANSACTION_NOTES Allows additional notes per transaction
SEQ_NO Primary key
TRANSACTION_ID The transaction
NOTE The note
STATE_PARTY Maps participants to states
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
PUBLIC_KEY_HASH The pk of the participant
X500_NAME The name of the participant or null if unknown.
V_PKEY_HASH_EX_ID_MAP This is a database view used to map states to external ids.
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
PUBLIC_KEY_HASH The public key of the participant.
EXTERNAL_ID The external id.

Fungible states

_images/vault_fungible_states.png
VAULT_FUNGIBLE_STATES Properties specific to fungible states
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
ISSUER_NAME Issuer
ISSUER_REF Reference number used by the issuer
OWNER_NAME X500 name of the owner, or null if unknown
QUANTITY The amount.
VAULT_FUNGIBLE_STATES_PARTS Many-to-one participants to a fungible state
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
PARTICIPANTS X500 name of participant.

Linear states

_images/vault_linear_states.png
VAULT_LINEAR_STATES Properties specific to linear states
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
EXTERNAL_ID The external id of this linear state.
UUID The internal id of this linear state.
VAULT_LINEAR_STATES_PARTS Many-to-one participants to a linear state
OUTPUT_INDEX Reference to a state - index in transaction
TRANSACTION_ID Reference to a state - transaction id
PARTICIPANTS X500 name of participant.

Hot cold setup

NODE_MUTUAL_EXCLUSION Lock for hot-cold deployments. Only 1 entry with the active machine.
MUTUAL_EXCLUSION_ID Primary key
MACHINE_NAME The machine holding the lock
PID The process id
MUTUAL_EXCLUSION_TIMESTAMP When the lock was taken.
VERSION The version

Liquibase database migration

These are Liquibase proprietary tables used by Corda internally and by CorDapps to manage schema change and evolution.

DATABASECHANGELOG Read more: DATABASECHANGELOG
ID  
AUTHOR  
FILENAME  
DATEEXECUTED  
ORDEREXECUTED  
EXECTYPE  
MD5SUM  
DESCRIPTTION  
COMMENTS  
TAG  
LIQUIBASE  
CONTEXTS  
LABELS  
DEPLOYMENT_ID  
DATABASECHANGELOGLOCK Read more: DATABASECHANGELOGLOCK
ID  
LOCKED  
LOCKGRANTED  
LOCKEDBY