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Oracle supports the storage of binary data as well as text. Binary data is not subject to the character set conversions we discussed earlier with regard to the CHAR and VARCHAR2 types. Therefore, binary datatypes are not suitable for storing user-supplied text, but are suitable for storing encrypted information encrypted data is not text, but a binary representation of the original text, word processing documents containing binary markup information, and so on. Anything that should not be considered by the database to be text and that should not have character set conversion applied to it should be stored in a binary datatype. Oracle supports three datatypes for storing binary data: The RAW type, which we focus on in this section and is suitable for storing RAW data up to 2,000 bytes in size. The BLOB type, which supports binary data of much larger sizes, coverage of which we ll defer to the LOB Types section later in the chapter. The LONG RAW type, which is supported for backward compatibility and should not be considered for new applications. The syntax for the binary RAW type is straightforward: RAW( <size> ) For example, the following code creates a table capable of storing 16 bytes of binary information per row:

A common misunderstanding among DBAs is that once the database is behind a firewall, it s immune to security attacks. This presupposes, of course, that your security threats are always external, when real-life statistics point out that the majority of security violations are from insiders. That s why you have to follow a rock-solid authentication policy and sound data-access policies. You can take several basic steps to enhance the security of your Oracle database. Most of these steps are based on common sense and prohibit easy entry into the database through well-known backdoor access points. Let s quickly review these security guidelines.

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Most of the processes described previously are nonnegotiable you will have them if you have an Oracle instance running. (ARCn is technically optional but is, in my opinion, mandatory for all production databases!) The following processes are optional and will appear only if you make use of the specific feature. The following processes are unique to a database instance using ASM, as discussed in 3, Files :

As I mentioned in 6, when you create a new database using the DBCA, you can choose to implement automatic secure configuration for your database. By making the choice to use the new Oracle Database 11g secure configuration settings, you enable the following security-related features in your new database: Password-specific security settings: The database will enforce password expiration and other password-related security policies that enforce built-in complexity checking in the default password profile that you assign to users. Auditing: The database enables auditing for certain privileges by default. These privileges are considered crucial to database security, such as connecting to a database. The database stores the audit records in the AUD$ table by default and sets the audit_trail initialization parameter to the value db. Adoption of the automatic secure configuration feature ensures that your database conforms to the security features recommended by the Center for Internet Security (CIS) benchmarks.

Automatic Storage Management Background (ASMB) process: The ASMB process runs in a database instance that is making use of ASM. It is responsible for communicating to the ASM instance that is managing the storage, providing updated statistics to the ASM instance, and providing a heartbeat to the ASM instance, letting it know that it is still alive and functioning. ReBALance (RBAL) process: The RBAL process also runs in a database instance that is making use of ASM. It is responsible for processing a rebalance request (a redistribution request) as disks are added/removed to and from an ASM disk group.

ops$tkyte@ORA10GR1> create table t ( raw_data raw(16) ); Table created The RAW type is much like the VARCHAR2 type in terms of storage on disk The RAW type is a variable-length binary string, meaning that the table T just created, for example, may store anywhere from 0 to 16 bytes of binary data It is not padded out like the CHAR type When dealing with RAW data, you will likely find it being implicitly converted to a VARCHAR2 type that is, many tools such as SQL*Plus will not display the RAW data directly, but will convert it to a hexadecimal format for display In the following example, we create some binary data in our table using SYS_GUID(), a built-in function that returns a 16-byte RAW string that is globally unique (GUID stands for globally unique identifier): ops$tkyte@ORA10GR1> insert into t values ( sys_guid() ); 1 row created.

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