TDWMSetLimits Function | Application Programming Reference | Teradata Vantage - 17.10 - TDWMSetLimits - Advanced SQL Engine - Teradata Database

Teradata Vantageā„¢ - Application Programming Reference

Product
Advanced SQL Engine
Teradata Database
Release Number
17.10
Release Date
July 2021
Content Type
Programming Reference
Publication ID
B035-1090-171K
Language
English (United States)

Updates the system query or system session throttle limits of a rule in the TDWM database.

Syntax

REPLACE PROCEDURE TDWM.TDWMSetLimits (
  IN RuleSetId     INTEGER,
  IN RuleName      TD_ANYTYPE,
  IN TDWMLock      VARCHAR(1) CHARACTER SET LATIN,
  IN SessionLimit  INTEGER,
  IN QueryLimit    INTEGER,
  IN UtilityLimit  INTEGER,
  IN TimeUnit      VARCHAR(1) CHARACTER SET LATIN,
  IN QualifyTime   INTEGER
)
  ...
;

Syntax Elements

RuleSetId
ID of the rule set in which the rule is found.
RuleName
Name of the rule specified.
TDWMLock
Type of request performed on the TDWMLock table:
  • W = Wait for the TDWMLock
  • A = Abort if the TDWMLock table is locked
  • S = Perform the update without locking the TDWMLock table
The TDWM places an exclusive lock on the TDWMLock table at startup.
SessionLimit
Maximum number of concurrent sessions. NULL indicates that the field is not changed.
QueryLimit
Maximum number of concurrent queries. NULL indicates that the field is not changed.
If the rule is an arrival rate meter, this value is used with TimeUnit and QualifyTime to describe an arrival rate limit. The limit is QueryLimit/TimeUnit for QualifyTime. For example, a maximum of 10 (requests)/minute for 120 seconds.
UtilityLimit
Maximum number of concurrent utilities. NULL indicates that the field is not changed.
TimeUnit
The time unit of the arrival rate meter:
  • H = hour
  • M = minute
  • S = second
QualifyTime
Number of seconds that the arrival rate must continuously remain at the limit before new requests are held in the Defer queue.

Example: Using TDWMSetLimits

CALL TDWM.TDWMSetLimits(1, 'throttle1', 'A', NULL, 10, NULL);