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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.

Perl Websites (continued)

MonthDayPattern RFC1123Pattern SortableDateTimePattern (ISO 8601)

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in one byte, then UTF8 becomes much less efficient because the multibyte characters must be assembled, at runtime, from a number of single bytes, with a consequent performance hit Also, UTF8 will often need three or even four bytes to store a character that AL16UTF16 can encode in two The second possibility for a fully multilingual database is to use Unicode as the actual database character set The supported options are UTF8 and AL32UTF8, which are both variable-width multibyte character sets The only limitation on the database character set is that it must have either US7ASCII or EBCDIC as a subset This is because the database character set is used to store SQL and PL/SQL source code, which is written in these characters Both the database character set and the National Character Set are specified in the CREATE DATABASE command The defaults are US7ASCII and AL16UTF16 If you create a database using the Database Creation Assistant (DBCA), DBCA will provide a default for the database character set, which it will pick up from the character set of the host operating system where you are running DBCA This may be more appropriate than the seven-bit Oracle default, but remember that your clients may be using terminals with a different operating system from the database server

Mailing lists fall into two distinct categories: announcements and discussions If the list is for announcements, you are not allowed to post to the group These tend to be low volume and are useful for keeping in touch with the direction of Perl If it s a discussion list, you can post and reply to messages just as you would in a Usenet newsgroup (for historical messages, try wwwdejanewscom) These are higher volume lists, and the number of messages can become unmanageable very quickly That said, a discussion list is likely to have the experts and users in it that are able to answer your questions and queries with authority

Appendix C:

There are many occasions when DBAs have wished that they could change the database character set Typically, this is because the database was created using the default of US7ASCII, and later on a need arises for storing information using characters not included in that character set, such as a French name Prior to release 9i there was no supported technique for changing the character set From 9i onward, there is a supported technique, but there is no guarantee that it will work It is your responsibility as DBA to carry out thorough checks that the change will not damage the data The problem is simply that a change of character set does not reformat the data currently in the datafiles, but it will change the way the data is presented For example, if you were to convert from a Western European character set to an Eastern European character set, many of the letters with the accents common in Western languages would then be interpreted as Cyrillic characters, with disastrous results There are two tools provided to assist with deciding on character set change: the Database Character Set Scanner and the Language and Character Set File Scanner These are independently executable utilities, csscan and lcsscan on Unix, csscanexe and lcsscanexe on Windows The Database Character Set Scanner will log on to the database and make a pass through the datafiles, generating a report of possible problems For example,

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