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Figure 12-2. Hello World stored in a CHAR(80) The fact that a CHAR/NCHAR is really nothing more than a VARCHAR2/NVARCHAR2 in disguise makes me of the opinion that there are really only two character string types to ever consider, namely VARCHAR2 and NVARCHAR2. I have never found a use for the CHAR type in any application. Since a CHAR type always blank pads the resulting string out to a fixed width, we discover rapidly that it consumes maximum storage both in the table segment and any index segments. That would be bad enough, but there is another important reason to avoid CHAR/NCHAR types: they create confusion in applications that need to retrieve this information (many cannot find their data after storing it). The reason for this relates to the rules of character string comparison and the strictness with which they are performed. Let s use the 'Hello World' string in a simple table to demonstrate: ops$tkyte@ORA10G> create table t 2 ( char_column char(20), 3 varchar2_column varchar2(20) 4 ) 5 / Table created. ops$tkyte@ORA10G> insert into t values ( 'Hello World', 'Hello World' ); 1 row created.

All passwords are always automatically encrypted during network connections, using a modified Data Encryption Standard (DES) algorithm.

Rather than go into how to build one of those from scratch (which involves a long, complex sequence of events), we looked at an example that had already been implemented: the text index We closed with some of the most frequently asked questions on indexes as well as some myths about indexes This section covered topics ranging from the simple question Do indexes work with views to the more complex and subtle myth Space is never reused in an index We answered these questions and debunked the myths mostly through example, demonstrating the concepts as we went along..

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Another method of authenticating database users is the external authentication method, under which you match the user accounts at the operating system level with the usernames in the database. Oracle manages the user s privileges in the database itself, but the user authentication is performed by the operating system, which is external to the database. The advantage to this method is that you ll need only a single username for both the operating system and database connections. This can also help in auditing user actions, as the database names and operating system accounts correspond. To use operating system authentication, you first have to set the OS_AUTHENT_PREFIX configuration parameter in the init.ora file as follows: OS_AUTHENT_PREFIX = "" There shouldn t be a space between the pair of quotes.

ops$tkyte@ORA10G> select * from t; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA10G> select * from t where char_column = 'Hello World'; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA10G> select * from t where varchar2_column = 'Hello World'; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World So far, the columns look identical but, in fact, some implicit conversion has taken place and the CHAR(11) literal has been promoted to a CHAR(20) and blank padded when compared to the CHAR column. This must have happened since Hello World......... is not the same as Hello World without the trailing spaces. We can confirm that these two strings are materially different: ops$tkyte@ORA10G> select * from t where char_column = varchar2_column; no rows selected They are not equal to each other. We would have to either blank pad out the VARCHAR2_ COLUMN to be 20 bytes in length or trim the trailing blanks from the CHAR_COLUMN, as follows: ops$tkyte@ORA10G> select * from t where trim(char_column) = varchar2_column; CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World ops$tkyte@ORA10G> select * from t where char_column = rpad( varchar2_column, 20 ); CHAR_COLUMN VARCHAR2_COLUMN -------------------- -------------------Hello World Hello World

The default value for the OS_AUTHENT_PREFIX parameter is "OPS$", but that is only for maintaining backward compatibility.

Choosing the right datatype seems so easy and straightforward, but many times I see it done incorrectly. The most basic decision what type you use to store your data in will have repercussions on your applications and data for years to come. Thus, choosing the appropriate datatype is paramount. It is also hard to change after the fact in other words, once you implement it, you might be stuck with it for quite a while. In this chapter, we ll take a look at all of the Oracle basic datatypes available and discuss how they are implemented and when each might be appropriate to use. We won t examine user-defined datatypes as they re simply compound objects derived from the built-in Oracle datatypes. We ll investigate what happens when you use the wrong datatype for the job or even just the wrong parameters to the datatype (length, precision, scale, and so on). By the end of this chapter, you ll have an understanding of the types available to you, how they re implemented, when to use each type and, as important, why using the right type for the job is key.

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