Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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CHAPTER 12 ■ DATATYPES 535 Since there is a three-hour time difference between those two time zones, even though they show the “same time” of 17:02:32.212, the interval reported is a three-hour difference. When performing TIMESTAMP arithmetic on TIMESTAMPS WITH TIME ZONE types, Oracle automatically converts both types to UTC time first and then performs the operation. TIMESTAMP WITH LOCAL TIME ZONE Type This type works much like the TIMESTAMP type. It is a 7- or 11-byte field (depending on the precision of the TIMESTAMP), but it is normalized to be stored in database’s time zone. To see this, we’ll use the DUMP command once again. First, we create a table with three columns—a DATE, a TIMESTAMP WITH TIME ZONE, and a TIMESTAMP WITH LOCAL TIME ZONE—and then we insert the same value into all three columns: ops$tkyte@ORA10G> create table t 2 ( dt date, 3 ts1 timestamp with time zone, 4 ts2 timestamp with local time zone 5 ) 6 / Table created. ops$tkyte@ORA10G> insert into t (dt, ts1, ts2) 2 values ( timestamp'2005-06-05 17:02:32.212 US/Pacific', 3 timestamp'2005-06-05 17:02:32.212 US/Pacific', 4 timestamp'2005-06-05 17:02:32.212 US/Pacific' ); 1 row created. ops$tkyte@ORA10G> select dbtimezone from dual; DBTIMEZONE ---------- US/Eastern Now, when we dump those values as follows: ops$tkyte@ORA10G> select dump(dt), dump(ts1), dump(ts2) from t; DUMP(DT) ------------------------------------ DUMP(TS1) ------------------------------------ DUMP(TS2) ------------------------------------ Typ=12 Len=7: 120,105,6,5,18,3,33 Typ=181 Len=13: 120,105,6,6,1,3,33,12,162,221,0,137,156 Typ=231 Len=11: 120,105,6,5,21,3,33,12,162,221,0
536 CHAPTER 12 ■ DATATYPES We can see that in this case, three totally different date/time representations were stored: • DT: This column stored the date/time 5-JUN-2005 17:02:32. The time zone and fractional seconds are lost because we used the DATE type. No time zone conversions were performed at all. We stored the exact date/time inserted, but lost the time zone. • TS1: This column preserved the TIME ZONE information and was normalized to be in UTC with respect to that TIME ZONE. The inserted TIMESTAMP value was in the US/Pacific time zone, which at the time of this writing was seven hours off UTC. Therefore, the stored date/time was 6-JUN-2005 00:02:32.212. It advanced our input time by seven hours to make it UTC time, and it saved the time zone US/Pacific as the last 2 bytes so this data can be properly interpreted later. • TS2: This column is assumed to be in the database’s time zone, which is US/Eastern. Now, 17:02:32 US/Pacific is 20:02:32 US/Eastern, so that is what was stored in the bytes ...21,3,33... (excess-1 notation; remember to subtract 1). Since the TS1 column preserved the original time zone in the last 2 bytes, we’ll see the following upon retrieval: ops$tkyte@ORA10G> select ts1, ts2 from t; TS1 ---------------------------------------- TS2 ---------------------------------------- 05-JUN-05 05.02.32.212000 PM US/PACIFIC 05-JUN-05 08.02.32.212000 PM The database would be able to show that information, but the TS2 column with the LOCAL TIME ZONE (the time zone of the database) shows the time in the database’s time zone, which is the assumed time zone for that column (and, in fact, all columns in this database with the LOCAL TIME ZONE). My database was in the US/Eastern time zone, so 17:02:32 US/Pacific on the way in is now displayed as 8:00 pm East Coast time on the way out. The TIMESTAMP WITH LOCAL TIME ZONE provides sufficient support for most applications, if you need not remember the source time zone, but only need a datatype that provides consistent worldwide handling of date/time types. Additionally, the TIMESTAMP(0) WITH LOCAL ➥ TIMEZONE provides you the equivalent of a DATE type with time zone support; it consumes 7 bytes of storage and allows you to store dates “normalized” in UTC form. One caveat with regard to the TIMESTAMP WITH LOCAL TIME ZONE type is that once you create tables with this column, you will find your database’s time zone is “frozen,” and you will not be able to change it: ops$tkyte@ORA10G> alter database set time_zone = 'PST'; alter database set time_zone = 'PST' * ERROR at line 1: ORA-30079: cannot alter database timezone when database has TIMESTAMP WITH LOCAL TIME ZONE columns
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Expert Oracle Database Architecture
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Contents Foreword . . . . . . . . .
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■CONTENTS v Block Buffer Cache .
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■CONTENTS vii ■CHAPTER 9 Redo a
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■CONTENTS ix ■CHAPTER 12 Dataty
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Foreword “THINK.” In 1914, Thom
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■FOREWORD xiii Tom is an aficiona
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About the Technical Reviewers ■JO
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Introduction The inspiration for th
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Setting Up Your Environment In this
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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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