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Part 2: The 32-Bit/64-Bit Drivers : The Oracle Wire Protocol Driver : Connection Option Descriptions : Client ID
  
Client ID
Attribute
ClientID (CID)
Purpose
Additional information about the client to be stored in the database. This value sets the CLIENT_IDENTIFIER value in the V$SESSION table on the server. This value is used by the client information feature.
This option only applies to connections to Oracle 10g R2 and higher database servers.
Valid Values
string
where:
string
is additional information about the client.
Notes
*You can also specify this information using the Oracle DBMS_SESSION.SETIDENTIFIER procedure or the DBMS_APPLICATION_INFO.SET_CLIENT_INFO procedure.
*This connection option can affect performance.
Default
None
GUI Tab
Client Monitoring tab
See also
Performance Considerations