Connection string

Parameter name	Description	Value if omitted
Database	Initial database for connection	default
Username	Authentication username	default
Password	Authentication password
Host	ClickHouse server address	localhost
Port	ClickHouse server port	8123 or 8443 (depending on Protocol and library version)
Driver	Deprecated since version 2.0	Binary
Compression	Enables GZip compression of data	true from version 2.0, false earlier
UseSession	Enables use of server sessions	false
SessionId	Explicitly set session ID (string)	random GUID
Timeout	Sets HTTP timeout duration	120
Protocol	Sets protocol used (HTTP or HTTPS)	http
UseServerTimezone	Use server timezone for datetime columns without TZ spec	true in 6.0.0+, false before that
UseCustomDecimals	Use ClickHouseDecimal class for decimal values	false

Example: Host=clickhouse;Port=8123;Username=default;password=;Database=default

Note: sessions

UseSession flag enables persistence of server session, allowing use of SET statements and temp tables. Session will be reset after 60 seconds of inactivity (default timeout). Session life0time can be extended by setting session settings via ClickHouse statements

ClickHouseConnection class normally allows for parallel operation (multiple threads can run queries concurrently). However, enabling UseSession flag will limit that to one active query per connection at any moment of time (serverside limitation)