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ops$tkyte@O10GUTF> select * 2 from nls_database_parameters 3 where parameter = 'NLS_CHARACTERSET'; PARAMETER VALUE ------------------------------ -------------------NLS_CHARACTERSET AL32UTF8 ops$tkyte@O10GUTF> create table t 2 ( a varchar2(1), 3 b varchar2(1 char), 4 c varchar2(4000 char) 5 ) 6 / Table created. Now, if we try to insert into our table a single character that is 2 bytes long in UTF, we observe the following: ops$tkyte@O10GUTF> insert into t (a) values (unistr('\00d6')); insert into t (a) values (unistr('\00d6')) * ERROR at line 1: ORA-12899: value too large for column "OPS$TKYTE"."T"."A" (actual: 2, maximum: 1) This example demonstrates two things: VARCHAR2(1) is in bytes, not characters. We have single Unicode character, but it won t fit into a single byte. As you migrate an application from a single-byte, fixed-width character set to a multibyte character set, you might find that the text that used to fit into your fields no longer does. The reason for the second point is that a 20-character string in a single-byte character set is 20 bytes long and will absolutely fit in a VARCHAR2(20). However a 20-character field could be as long as 80 bytes in a multibyte character set, and 20 Unicode characters may well not fit in 20 bytes. You might consider modifying your DDL to be VARCHAR2(20 CHAR) or using the NLS_LENGTH_SEMANTICS session parameter mentioned previously when running your DDL to create your tables. If we insert that single character into a field set up to hold a single character, we will observe the following: ops$tkyte@O10GUTF> insert into t (b) values (unistr('\00d6')); 1 row created. ops$tkyte@O10GUTF> select length(b), lengthb(b), dump(b) dump from t; LENGTH(B) LENGTHB(B) DUMP ---------- ---------- -------------------1 2 Typ=1 Len=2: 195,150

The large pool will default to some size if the parameter DBWR_IO_SLAVES or PARALLEL_MAX_SERVERS is set to some positive value You should set the size of the large pool manually if you are using a feature that employs it The default mechanism is typically not the appropriate value for your situation..

Note that encrypting data will result in a performance hit, especially when users are selecting or inserting data. If you decide you want to turn off encryption for any reason, you can do so by using the DECRYPT keyword, as shown here: SQL> ALTER TABLE employees MODIFY (ssn DECRYPT);

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This process is new in Oracle Database 11g Release 1 and above. It is the key component of the new flashback data archive capability the ability to query data as of long periods of time ago (for example, to query data in a table as it appeared one year ago, five years ago, and so on). This long term historical query capability is achieved by maintaining a history of the row changes made to every row in a table over time. This history, in turn, is maintained by the FBDA process in the background. This process functions by working soon after a transaction commits. The FBDA process will read the UNDO generated by that transaction and roll back the changes made by the transaction. It will then record these rolled back (the original values) rows in the flashback data archive for us.

The encrypted columns in the employees table use the default encryption algorithm. This default encryption algorithm uses salt, which involves adding a random string to data before it s encrypted, thus making it harder for someone to match patterns in the text. As mentioned earlier, you can index transparently encrypted columns, but Oracle recommends that you not use salt if you plan on using indexes on the encrypted columns. If you don t wish to use salt, specify the ENCRYPT NO SALT option when you encrypt a column. Similarly, if you wish to use a nondefault encryption algorithm, you can do so by specifying the algorithm when you encrypt the column, as shown in the following example, where the 3DES168 algorithm is used: ssn NUMBER(9) ENCRYPT USING '3DES168'

The INSERT succeeded, and we can see that the LENGTH of the inserted data is one character all of the character string functions work character-wise So the length of the field is one character, but the LENGTHB (length in bytes) function shows it takes 2 bytes of storage, and the DUMP function shows us exactly what those bytes are That example demonstrates one very common issue people encounter when using multibyte character sets, namely that a VARCHAR2(N) doesn t necessarily hold N characters, but rather N bytes.

You can use the DBMS_OBFUSCATION_TOOLKIT and the DBMS_CRYPTO packages provided by Oracle to implement encryption of data. Both these packages, however, impose a burden on you in the sense that your application must manage the encryption keys as well as call the APIs to encrypt and decrypt the data. To overcome these drawbacks, Oracle Database 10g introduced Transparent Data Encryption (TDE), which enabled you to encrypt columns in a table. The feature is called transparent because the database takes care of all the encryption and decryption details. In Oracle Database 11g, you can also encrypt an entire tablespace. In fact, tablespace encryption helps you get around some of the restrictions imposed on encrypting a column in a table through the TDE feature. For example, you can get around the restriction that makes it impossible for you to encrypt a column that s part of a foreign key or that s used in another constraint, by using tablespace encryption.

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