16.20 - Query Bands, Trusted Sessions, and Connection Pooling - Teradata Database - Teradata Vantage NewSQL Engine

Teradata Vantage™ SQL Data Definition Language Detailed Topics

Teradata Database
Teradata Vantage NewSQL Engine
Release Number
March 2019
Content Type
Programming Reference
Publication ID
English (United States)

Connection pooling is a technique for sharing server resources among various requesting client applications. It enables multiple clients to share a cached set of connection objects that provides access to Teradata Database. Connection pooling improves performance by eliminating the overhead associated with establishing a new connection to Teradata Database for each request submitted by a client application.

Trusted sessions do not change the handling of session parameters in connection pooling by default. Note the following restrictions for connection pooling with Teradata Database. Because it is not possible to reset a connection to Teradata Database, you must not change any of the following session parameters during a trusted session, because any changes to them are then inherited by the next user of the connection.
  • Character set
  • Collation
  • Database
  • Dateform
  • Default Date Format
  • Timezone
  • Transaction Isolation Level

For information about how to change session parameters, see "SET SESSION" in Teradata Vantage™ SQL Data Definition Language Syntax and Examples, B035-1144.