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Oracle ORA-01878 Error: Causes and Solutions Complete Guide

#oracle #database #dba #sql

ORA-01878: Specified Field Not Found in Datetime or Interval

ORA-01878 is an Oracle error that occurs when you reference a field that does not exist within a given DATETIME or INTERVAL data type. The most common real-world trigger is attempting to insert or convert a timestamp that falls within a Daylight Saving Time (DST) gap — a period that simply does not exist on the clock.

Top 3 Causes

1. Inserting a Non-Existent DST Gap Timestamp

When clocks spring forward (e.g., from 02:00 to 03:00), the times in between never exist. Oracle raises ORA-01878 if you try to store or convert one of those phantom times using TIMESTAMP WITH TIME ZONE.

-- This timestamp does not exist in US/Eastern on March 10, 2024
INSERT INTO event_log (event_time)
VALUES (TO_TIMESTAMP_TZ('2024-03-10 02:30:00 US/Eastern',
        'YYYY-MM-DD HH24:MI:SS TZR'));
-- ERROR: ORA-01878

-- Fix: Store in UTC instead
INSERT INTO event_log (event_time)
VALUES (FROM_TZ(TO_TIMESTAMP('2024-03-10 07:30:00',
        'YYYY-MM-DD HH24:MI:SS'), 'UTC'));
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2. Using EXTRACT with an Incompatible Field

Each INTERVAL type only supports specific fields. Trying to extract SECOND from an INTERVAL YEAR TO MONTH, or YEAR from an INTERVAL DAY TO SECOND, will trigger this error.

-- Wrong: SECOND does not exist in YEAR TO MONTH interval
SELECT EXTRACT(SECOND FROM INTERVAL '3-6' YEAR TO MONTH)
FROM DUAL;
-- ERROR: ORA-01878

-- Correct: Use only supported fields
SELECT EXTRACT(YEAR  FROM INTERVAL '3-6' YEAR TO MONTH) AS years,
       EXTRACT(MONTH FROM INTERVAL '3-6' YEAR TO MONTH) AS months
FROM DUAL;

-- Correct: INTERVAL DAY TO SECOND supports DAY, HOUR, MINUTE, SECOND
SELECT EXTRACT(DAY    FROM INTERVAL '2 10:30:45' DAY TO SECOND) AS days,
       EXTRACT(HOUR   FROM INTERVAL '2 10:30:45' DAY TO SECOND) AS hours,
       EXTRACT(MINUTE FROM INTERVAL '2 10:30:45' DAY TO SECOND) AS minutes,
       EXTRACT(SECOND FROM INTERVAL '2 10:30:45' DAY TO SECOND) AS seconds
FROM DUAL;
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3. FROM_TZ Targeting a DST Transition Window

FROM_TZ combines a plain TIMESTAMP with a timezone string. If the resulting local time lands inside a DST gap, Oracle cannot resolve it and throws ORA-01878.

-- Fails because 02:30 America/New_York doesn't exist on DST change day
SELECT FROM_TZ(TO_TIMESTAMP('2024-03-10 02:30:00',
       'YYYY-MM-DD HH24:MI:SS'), 'America/New_York')
FROM DUAL;
-- ERROR: ORA-01878

-- Fix: Attach UTC timezone, then convert for display
SELECT FROM_TZ(TO_TIMESTAMP('2024-03-10 07:30:00',
       'YYYY-MM-DD HH24:MI:SS'), 'UTC')
       AT TIME ZONE 'America/New_York' AS eastern_time
FROM DUAL;

-- Check your DB and session timezone
SELECT DBTIMEZONE, SESSIONTIMEZONE FROM DUAL;

-- Temporarily set session to UTC to avoid DST issues
ALTER SESSION SET TIME_ZONE = 'UTC';
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Quick Fix Solutions 

-- 1. Identify your Oracle timezone file version
SELECT * FROM V$TIMEZONE_FILE;

-- 2. Use SYS_EXTRACT_UTC to strip timezone ambiguity
SELECT SYS_EXTRACT_UTC(SYSTIMESTAMP) AS utc_now FROM DUAL;

-- 3. PL/SQL guard for bulk inserts crossing DST boundaries
DECLARE
  v_ts TIMESTAMP WITH TIME ZONE;
BEGIN
  BEGIN
    v_ts := TO_TIMESTAMP_TZ('2024-03-10 02:30:00 US/Eastern',
                             'YYYY-MM-DD HH24:MI:SS TZR');
  EXCEPTION
    WHEN OTHERS THEN
      IF SQLCODE = -1878 THEN
        -- Fall back to UTC equivalent
        v_ts := FROM_TZ(TO_TIMESTAMP('2024-03-10 07:30:00',
                        'YYYY-MM-DD HH24:MI:SS'), 'UTC');
        DBMS_OUTPUT.PUT_LINE('DST gap detected — stored as UTC fallback.');
      ELSE
        RAISE;
      END IF;
  END;
  INSERT INTO event_log (event_time) VALUES (v_ts);
  COMMIT;
END;
/
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Prevention Tips

Always store timestamps in UTC. DST shifts only affect regional timezones; UTC never has gaps. Set your database or session timezone to UTC and convert to local time only at the presentation layer.

ALTER SESSION SET TIME_ZONE = 'UTC';
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Keep Oracle DST patch files up to date. Governments change DST rules without much notice. Apply Oracle's periodic DST patches (available on Oracle Support) to keep timezone data current. An outdated timezone file is a silent source of ORA-01878 surprises in production.

Related Errors

  • ORA-01882 – Timezone region not found (invalid timezone name supplied)
  • ORA-01830 – Date format picture ends before converting entire input string
  • ORA-01843 – Not a valid month (invalid month value during date conversion)

📖 Want a more detailed guide?
Check out the full in-depth version (Korean) on oraerror.com — includes detailed analysis, additional SQL examples, and prevention tips.

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