User Programmatic Interface

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In computing, the User Programmatic Interface (UPI), also known as the User Program Interface, consists of a set of C-language software APIs which provide the lowest-level API-based interface to the Oracle database.


UPI offers a procedural API for not only performing certain database administration tasks (such as system startup and shutdown), but also for using PL/SQL or SQL to query, access, and manipulate data. The UPI library, an undocumented API used internally by Oracle, deals directly with the Two-Task Common (TTC)[1] aspect of the Oracle Client software stack.

UPI-based applications[edit]

Several Oracle database applications depend on UPI, including:

  • Oracle Forms
  • SQL*Plus (also uses OCI)
  • Oracle Corporation's data-import and -export (IMP/EXP) utilities

UPI-Based Libraries[edit]

Several libraries depend on UPI, including:

External links[edit]


  1. ^ Achacoso, Robwert; et al. (December 2009). Oracle Database Net Services Administrator's Guide 11g Release 2 (11.2). Oracle Corporation. Retrieved 2010-02-14. Two-Task Common (TTC)[:] A presentation layer type [...] used in a typical Oracle Net connection to provide character set and data type conversion between different character sets or formats on the client and server.