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NLS_TERRITORY NLS_CURRENCY NLS_DUAL_CURRENCY NLS_ISO_CURRENCY NLS_DATE_FORMAT NLS_NUMERIC_CHARACTERS NLS_TIMESTAMP_FORMAT NLS_TIMESTAMP_TZ_FORMAT
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AMERICA / Geographical location $ / Local currency symbol $ / A secondary currency symbol for the territory AMERICA / Indicates the ISO territory currency symbol DD-MM-RR / Format used for columns of data type DATE , / Decimal and group delimiters DD-MM-RRHHMISSXFF AM / Format used for columns of data type TIMESTAMP DD-MM-RRHHMISSXFF AM TZR / Format used for columns of data type TIMESTAMP WITH LOCAL TIMEZONE
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PART III
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Figure 26-2 Date and time formats, on the sixth of March in the afternoon, in a time zone two hours ahead of Greenwich Mean Time (GMT)
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Apart from the language- and territory-related settings just described, there are a few more advanced settings that are less likely to cause problems:
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NLS_CALENDAR NLS_COMP NLS_LENGTH_SEMANTICS NLS_NCHAR_CONV_EXCP
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Gregorian / Allows use of alternative calendar systems BINARY / The alternative of ANSI compares letters using their NLS value, not the numeric equivalent BYTE / Allows one to manipulate multibyte characters as complete characters rather than bytes FALSE / Limits error messages generated when converting between VARCHAR2 and NVARCHAR
Figure 26-3 illustrates switching to the Japanese Imperial calendar (which counts the years from the ascension of Emperor Akihito to the throne), with an associated effect on the date display
Using Globalization Support Features
Globalization can be specified at any and all of five levels: The database The instance The client environment The session The statement
Figure 26-3
Use of the Japanese Imperial calendar
26: Globalization
The levels are listed in ascending order of priority Thus, instance settings take precedence over database settings, and so on An individual statement can control its own globalization characteristics, thus overriding everything else EXAM TIP Remember the precedence of the various points where globalization settings can be specified On the server side, instance settings take precedence over database settings, but all the server settings can be overridden on the client side: first by the environment, then at the session and statement levels
Choosing a Character Set
At database creation time, choice of character set is one of the two most important decisions you make When you create a database, two settings are vital to get right at creation time; everything else can be changed later These two are the DB_BLOCK_SIZE parameter, which can never be changed, and the database character set, which it may be possible but not necessarily practicable to change The difficulty with the DB_BLOCK_ SIZE is that this parameter is used as the block size for the SYSTEM tablespace You can t change that without re-creating the data dictionary: in other words, creating a new database The database character set is used to store all the data in columns of type VARCHAR2, CLOB, CHAR, and LONG (although still supported, you should not be using LONG datatypes unless you need them for backward compatibility) If you change it, you may well destroy all the data in your existing columns of these types It is therefore vital to select, at creation time, a character set that will fulfill all your needs, present and future For example, if you are going to have data in French or Spanish, a Western European character set is needed If you are going have data in Russian or Czech, you should choose an Eastern European character set But what if you may have both Eastern and Western European languages Furthermore, what if you anticipate a need for Korean or Thai as well Oracle provides two solutions to the problem: the National Character Set and the use of Unicode The National Character Set was introduced with release 80 of the database This is a second character set, specified at database creation time, which is used for columns of data types NVARCHAR2, NCLOB, and NCHAR So if the DBA anticipated that most of the information would be in English but that some would be Japanese, they could select a Western European character set for the database character set, and a Kanji character set as the National Character Set With release 9i, the rules changed: from then on, the National Character Set can only be Unicode This should not lead to any drop in functionality, because the promise of Unicode is that it can encode any character Two types of Unicode are supported as the National Character Set: AL16UTF16 and UTF8 AL16UTF16 is a fixed-width, two-byte character set, and UTF8 is a variablewidth character set The choice between the two is a matter of space efficiency and performance, related to the type of data you anticipate storing in the NVARCHAR2 and NCLOB columns It may very well be that the majority of the data could in fact be represented in one byte, and only a few characters would need multiple bytes In that case, AL16UTF16 will nearly double the storage requirements quite unnecessarily, because one of the two bytes per character will be packed with zeros This not only wastes space but also impacts on disk I/O UTF8 will save a lot of space But if the majority of the data cannot be coded PART III
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