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Hyper-Converged Database
1.2
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1.2 (Latest)
1.1
Get started
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Get started with HCD
Intro to HCD
About vector databases
Tutorials
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Use vector search with CQL
Create tables and run queries with SAI
Use SAI text analyzers with CQL
Use the HCD component in Langflow
Architecture
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HCD architecture
Data distribution and replication
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Distribute and replicate data
Data distribution to nodes
Consistent hashing
Virtual nodes
Data replication
Partitioners
Snitches
Node repair
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About node repair
Anti-entropy repair
Hinted handoff: repair during write path
Read Repair: repair during read path
Database internals
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Storage engine
Reads and writes
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Database reads and writes
How is data written?
How is data maintained?
How is data updated?
How is data deleted?
What are tombstones?
How are indexes stored and updated?
How is data read?
How do write patterns affect reads?
Data consistency
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Read and write consistency
Differences between HCD and RDMBS transactions
Use lightweight transactions
Consistency level performance
Consistency level configuration
Configuring serial consistency
Read requests
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Read request types
Read consistency levels examples
Write requests
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About write requests
Multiple datacenter write requests
Installation
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Pre-installation capacity planning
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Configuration
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Configuration topics
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YAML and configuration properties
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YAML files and configuration properties
cassandra.yaml
hcd.yaml
cassandra-rackdc.properties
cassandra-topology.properties
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Set JVM system properties
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Virtual node (vnode) configuration
Enable virtual nodes on an existing production cluster
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Log configuration
Change logging locations
Configure logging
Commit log archive configuration
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Operations
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Operational commands
Start and stop HCD
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About HCD start and stop
Start as a stand-alone process
Stop a node
Add or remove nodes, datacenters, or clusters
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Commands to add or remove database elements
Add nodes to vnode-enabled cluster
Add a datacenter to a cluster using a designated datacenter as a data source
Replace a dead node or dead seed node
Replace a running node
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About replacing a running node
Add a node, decommission the old node
Replace a running node
Move a node from one rack to another
Remove a node
Change the IP address of a node
Switch snitches
Change keyspace replication strategy
Migrate or rename a cluster
Add single-token nodes to a cluster
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Replace a dead node in a single-token architecture cluster
Backup and restore data using snapshots
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About snapshots
Take a snapshot
Delete snapshot files
Restore from a snapshot
Restore a snapshot into a new cluster
Recover from a single disk failure using JBOD
Repair nodes
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About repair nodes
Manual repair: Anti-entropy repair
When to run anti-entropy repair
Change repair strategies
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About changing repair strategies
Migrate to full repairs
Migrate to incremental repairs
Monitor an HCD cluster
Tune the database
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Tasks to tune the database
Tune Java Virtual Machine
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About tuning Java Virtual Machine
Change heap size parameters
Configure the garbage collector
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About garbage collector configuration
G1 MaxGCPauseMillis
CMS parameters
Tune Bloom filters
Configure memtable thresholds
Configure data caches
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Configure data caches
Enable caching globally
Tips for efficient cache use
Monitor and adjust caching
Compaction and compression
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About compaction and compression
Configure compaction
Compression
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About compression
When to compress data
Configure compression
Test compaction and compression
Materialized views maintenance guidelines
Migrate data to HCD
Clear data from HCD
Tools
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nodetool
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nodetool
Get information
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Commands to get information
clientstats
createsystemkey
describecluster
describering
getbatchlogreplaythrottle
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getcachekeystosave
getconcurrentviewbuilders
getendpoints
getinterdcstreamthroughput
getlogginglevels
getseeds
getsstables
getstreamthroughput
gettimeout
gettraceprobability
help
info
inmemorystatus
rangekeysample
ring
status
version
Collect metrics
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Commands to collect metrics
gcstats
netstats
proxyhistograms
tablehistograms
tablestats
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tpstats
Perform operations
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assassinate
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drain
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gossipinfo
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invalidaterowcache
import
join
move
refresh
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sequence
sjk
statusbinary
statusgossip
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upgradesstables
Adjust Settings
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Commands to adjust settings
reloadseeds
setbatchlogreplaythrottle
setcachecapacity
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setconcurrentviewbuilders
setinterdcstreamthroughput
setlogginglevel
setstreamthroughput
settimeout
settraceprobability
Diagnose issues
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Diagnosis commands
failuredetector
leaksdetection
Manage backup
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clearsnapshot
disablebackup
enablebackup
listsnapshots
snapshot
statusbackup
Ensure data consistency
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Commands to ensure data consistency
abortrebuild
cleanup
flush
mark_unrepaired
rebuild
rebuild_index
rebuild_view
resetlocalschema
repair
scrub
verify
Manage compaction
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Commands to manage compaction
compact
compactionhistory
compactionstats
disableautocompaction
enableautocompaction
garbagecollect
getcompactionthreshold
getcompactionthroughput
getconcurrentcompactors
setcompactionthreshold
setcompactionthroughput
setconcurrentcompactors
statusautocompaction
stop
Manage hints
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Commands to manage hints
disablehandoff
disablehintsfordc
enablehandoff
enablehintsfordc
gethintedhandoffthrottlekb
getmaxhintwindow
handoffwindow
listendpointspendinghints
pausehandoff
resumehandoff
sethintedhandoffthrottlekb
setmaxhintwindow
statushandoff
truncatehints
SSTable tools
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About SSTable tools
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sstableexpiredblockers
sstablemetadata
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sstableutil
Perform operations
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Commands to perform operations
sstabledowngrade
sstablelevelreset
sstableloader
sstableofflinerelevel
sstablesplit
sstableupgrade
Ensure data consistency
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Commands to ensure data consistency
sstablerepairedset
sstablescrub
sstableverify
Connection methods
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Compare connection methods
CQL drivers
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C++ driver
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Cassandra Spark connector
CQL shell
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Connect with cqlsh
Use and configure cqlsh
Databases
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Find data
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Ways to find data
Find data with filters
Find data with vector search
Cluster management
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Manage cluster operations
Best practices for database clusters
HCD guardrails
Internode communication
Security
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HCD security overview
Security checklists
Authentication and authorization
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Authentication and authorization
About HCD Unified Authentication
Enable HCD unified authentication
Set up logins and users
Manage superuser accounts
Manage roles and permissions
Add database users
Roles
About RBAC
Set up application roles
Implementing separation of duties
Manage access
Control access to keyspaces and tables
Data resources
About database objects permissions
LDAP and external authentication
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Configure OIDC authentication
Define an LDAP scheme
Add roles for LDAP logins
Add roles for LDAP groups
Credential management
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Provide credentials on the command line
Provide credentials in a file
Provide credentials using environment variables
Connect to SSL-enabled nodes using cqlsh
Provide credentials for CQLSH
Encryption
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About TDE
Encrypt table data with KMIP keys
Encrypt tables with TDE
Create a table with encryption and compression
Table encryption options and syntax
Set up local encryption keys
Set up local encryption keys for distribution
Bulk load data between TDE-enabled clusters
Migrate encrypted tables from earlier versions
Encrypt configuration file properties
Encrypt system resources
Configure KMIP encryption
Encrypt KMIP system resources
Set up local encryption keys for production environments
Rekey tables using a new key
Use a remote keystore provider
Enable JCE Unlimited
Using tools with TDE-encrypted SSTables
SSL and certificates
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Configure SSL
Configure SSL for nodetool and hcd
Create SSL certificates, keystores, and truststores
Configure SSL for client-to-node connections
Configure SSL for node-to-node connections
Enable SSL Encryption for HCD
Reference: SSL instruction variables
Set up SSL for JConsole (JMX)
Provide credentials with JConsole
Secure Spark connections
Auditing and monitoring
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Set up database auditing
Use the audit log
View events from HCD audit table
Manage the Audit Logger Settings
Replace sensitive data in the audit log
secure:filtering-keyspaces.adoc
Log formats
JMX security
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Configure JMX authentication
Configure JMX on the server side
Control access to JMX MBeans
Provide credentials with nodetool
Authorize HCD client-tool and Spark
Authorize Remote Procedure Calls (RPC)
Remote procedure calls
Security best practices
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Database security checklist
Secure database ports
Secure the TMP directory
Steps for new deployment
About client connections
JMX Resources (MBeans) for HCD utilities
Authentication scheme resources
Configure HCD Unified Authentication
Configure security keyspaces replication factors
Secure schema information
Proxy Login and Execute
Connect SSTableloader to a secured cluster
Configure cache settings
Troubleshooting
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Troubleshoot encryption key errors
Troubleshoot KMIP connections
Migrate
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Migrate to HCD
Migrate DSE 6.8 to HCD 1.2
Data API reference
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Get started with the Data API
Quickstart for collections
Quickstart for tables
Migrate to the Data API
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Migrate from MongoDB
Migrate from CQL
Collections and documents
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Work with collections
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About collections with the Data API
Indexes
Document IDs
Data types
Filter operators
Update operators
Sort clauses
Projections
$date
$vector
Create a collection
Get a collection
List collection metadata
List collection names
Drop a collection
Insert a document
Insert documents
Find a document
Find documents
Find and update a document
Find and replace a document
Find and delete a document
Find distinct values
Update a document
Update documents
Replace a document
Count documents
Estimate document count
Delete a document
Delete documents
Tables and rows
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Work with tables
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About tables with the Data API
Primary keys
Indexes
Data types
Filter operators
Update operators
Sort clauses
Projections
Create a table
Get a table
Alter a table
List table metadata
List table names
Drop a table
Create an index
Create a vector index
List index metadata
List index names
Drop an index
Insert a row
Insert rows
Find a row
Find rows
Find distinct values
Update a row
Delete a row
Delete rows
Admin
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Create a keyspace
Drop a keyspace
List keyspaces
Clients
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Client upgrade guide
Instantiate a client object
Get a database object
Python client usage
TypeScript client usage
Java client usage
Data API limits
CQL API reference
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CQL API reference
Integrations
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Azure Arc
Third-party software
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1.1.2
1.1.1
Drivers
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Python quickstart
Node.js quickstart
Java quickstart
C++ quickstart (non-vector)
C# quickstart
Frequently asked questions
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FAQs
Release notes
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Release notes
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