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As part of securing the database, you must use all the standard password-management techniques, including changing passwords at set intervals, checking passwords for complexity, and preventing reuse of old passwords. Let s see how Oracle creates the default user accounts in a new database. The query in Listing 12-18 lists all the usernames and their status. An account may be open or it may be locked or expired. An open account is one you can log into, as long as you have a valid password. A locked account must be explicitly unlocked by the DBA. A locked regular account usually results from the user trying to enter the database with an incorrect password more times than the specified limit allows. An expired account is one whose password has to be changed, which ensures that the same passwords aren t used forever. Listing 12-18. Displaying the Account Status of All Users SQL> SELECT username, account_status 2 FROM dba_users; USERNAME ---------MGMT_VIEW SYS SYSTEM DBSNMP SYSMAN SCOTT OUTLN HR . . . 32 rows selected SQL> ACCOUNT_STATUS --------------OPEN OPEN OPEN OPEN OPEN OPEN EXPIRED & LOCKED EXPIRED & LOCKED

Character datatypes in Oracle, namely CHAR, VARCHAR2, and their N variants, NCHAR and NVARCHAR2, are capable of storing either 2,000 bytes or 4,000 bytes of text. This text is converted between various character sets as needed by the database. A character set is a binary representation of individual characters in bits and bytes. Many different character sets are available, and each is capable of representing different characters, for example: The US7ASCII character set is the ASCII standard representation of 128 characters. It uses the low 7 bits of a byte to represent these 128 characters. The WE8ISO8859P1 character set is a Western European character set capable of representing the 128 ASCII characters as well as 128 extended characters, using all 8 bits of a byte. Before we get into the details of CHAR, VARCHAR2, and their N variants, it would benefit us to get a cursory understanding of what these different character sets mean to us.

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This seems like common sense. If you are going to create an index on the columns C1 and C2 in a table T with 100,000 rows, and you find C1 has 100,000 distinct values and C2 has 25,000 distinct values, you would want to create the index on T(C1,C2). This means that C1 should be first, which is the commonsense approach. The fact is, when comparing vectors of data (consider C1, C2 to be a vector), it doesn t matter which you put first. Consider the following example. We will create a table based on ALL_OBJECTS and an index on the OWNER, OBJECT_TYPE, and OBJECT_NAME columns (least discriminating to most discriminating) and also on OBJECT_NAME, OBJECT_TYPE, and OWNER: ops$tkyte@ORA11GR2> create table t 2 as 3 select * from all_objects; Table created. ops$tkyte@ORA11GR2> create index t_idx_1 on t(owner,object_type,object_name); Index created. ops$tkyte@ORA11GR2> create index t_idx_2 on t(object_name,object_type,owner); Index created. ops$tkyte@ORA11GR2> select count(distinct owner), count(distinct object_type), 2 count(distinct object_name ), count(*) 3 from t; DISTINCTOWNER DISTINCTOBJECT_TYPE DISTINCTOBJECT_NAME COUNT(*) ------------- ------------------- ------------------- -------28 36 28537 48243 Now, to show that neither is more efficient space-wise, we ll measure their space utilization: ops$tkyte@ORA11GR2> analyze index t_idx_1 validate structure; Index analyzed. ops$tkyte@ORA11GR2> select btree_space, pct_used, opt_cmpr_count, opt_cmpr_pctsave 2 from index_stats; BTREE_SPACE PCT ----------- -----2702744 89.0 OPT_CMPR_COUNT OPT_CMPR_PCTSAVE -------------- ---------------2 28

The DBA must change the passwords for all default user accounts immediately after the database has been created. Any unnecessary default accounts must be locked and expired.

In most cases, when users issue a query against the database, there s more than one way to access the tables and retrieve the data. Because there are many ways to execute the same statement, Oracle uses a Cost-Based Optimizer (CBO) to choose the best execution plan for queries, based on the cost of the query in terms of resource use. Query optimizing is at the heart of modern relational databases and is an essential part of how Oracle conducts its operations. The query optimizer is transparent to users, and Oracle will automatically apply the best access and join methods to your queries before it starts processing.

ops$tkyte@ORA11GR2> analyze index t_idx_2 validate structure; Index analyzed. ops$tkyte@ORA11GR2> select btree_space, pct_used, opt_cmpr_count, opt_cmpr_pctsave 2 from index_stats; BTREE_SPACE PCT ----------- -----2702744 89.0 OPT_CMPR_COUNT OPT_CMPR_PCTSAVE -------------- ---------------1 13

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