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Brazil No Longer Observes DST From November 2019 Onwards- Impact on Oracle RDBMS (Doc ID 2603532.1)

Last updated on JANUARY 25, 2021

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Purpose

Starting November 2019  Brazil no longer observes DST

For Questions/official statements about the timezone change itself, please contact the Brazil Government .

IANA has updated Time Zone Database to reflect this change (tzcode2019b.tar) http://www.iana.org/time-zones

This change is included in the database DST patch v34 Patch 29997937


Scope

Anyone who may be using the affected Brazilian Timezone

The Oracle kernel itself is also not impacted by the OS/system clock changes (or for that matter Oracle DST patches).

Columns with datatypes TSTZ and TSLTZ are affected.

Note:1013279.6 How Does Daylight Savings Time Affect The Database Kernel?

Used abbreviations:
TZ: TimeZone
TSTZ: TimeStamp with Time Zone
TSLTZ: TimeStamp with Local Time Zone

Details

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In this Document
Purpose
Scope
Details
  1) The DATE dataype and SYSDATE / SYSTIMESTAMP
 2) Storing data in the TimeStamp with (Local) Time Zone datatype.
 3) TimeStamp with Time Zone columns are used, how do I see if the affected Brazil Timezones are stored?
 4) Database timezone , Session timezone and CURRENT_DATE , LOCALTIMESTAMP , CURRENT_TIMESTAMP functions
 5) Oracle DST patches and this change.
 6) The OJVM dst information
 7) Java in the Database home
 8) Other Oracle software (Enterprise Manager , Oracle Applications etc)
 9) Will any data stored in DATE, TIMESTAMP, TIMESTAMP WITH (LOCAL) TIMEZONE columns be affected by changing the server OS timezone?
References

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