I'm trying to do performance tracing and I'm getting strange numbers. A
stored procedure that runs for over sixteen seconds is being logged as
running for 0.0002 seconds.
Does anyone have any ideas as to what I could be doing wrong?

CREATE TABLE PERF_TRACE
(
PROC VARCHAR(32) NOT NULL,
DURATION DECIMAL(18,4) NOT NULL,
CONSTRAINT PK_PERF_TRACE PRIMARY KEY (PROC)
);

PROC DURATION
--------------
TEST 0.0000

DECLARE VARIABLE STRT TIMESTAMP;
...
STRT=CAST('NOW' AS TIMESTAMP);
/* runs for 16.703 seconds */
UPDATE PERF_TRACE p SET p.DURATION = p.DURATION + (CAST('NOW' AS
TIMESTAMP) - :STRT) WHERE p.PROC='TEST';

PROC DURATION
--------------
TEST 0.0002

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