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One of the first tasks to perform after you create a new database is to change the passwords for all the default users. The names and number of these default users could differ among databases. For example, if you choose to let Oracle create your database using the Oracle Universal Installer, you can pick a database customized for an OLTP, a DSS, or a hybrid database. Each of these databases has a different group of specialized default users associated with it. Nevertheless, all types of databases will have at least a handful of common default users. The following are some of the common default users in a new Oracle database: SQL> SELECT username FROM dba_users; USERNAME -------DBSNMP SYSTEM SYS OUTLN . . . SQL> You don t have to worry about the SYS and SYSTEM passwords, as you ve already changed them during the database-creation process. The OUTLN user account is used to provide stored outlines for SQL queries, and the DBSNMP account is for the Oracle Intelligent Agent. There may be other users created in your database, depending on the type of database you create and the options you choose for your database. The default password for each of these accounts is the same as the username. Change these passwords immediately, as they represent a potential security problem. For each of the default users, you must modify the default passwords, as shown in the following examples: SQL> ALTER USER outln IDENTIFIED BY 'new_password'; SQL> ALTER USER dbsnmp IDENTIFIED BY 'new_password';

Most default accounts (other than SYS, SYSTEM, DBSNMP, and SYSMAN) are initially locked with their passwords expired. You need to unlock and reset the passwords for these accounts, using the ALTER USER statement. 12 details how to unlock user passwords.

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For example, say we have a 10,000,000-row table with a primary key index on a number column: big_table@ORA11GR2> select index_name, blevel, num_rows 2 from user_indexes 3 where table_name = 'BIG_TABLE'; INDEX_NAME BLEVEL NUM_ROWS ------------------------------ ---------- ---------BIG_TABLE_PK 2 10441513 The BLEVEL is 2, meaning the HEIGHT is 3, and it will take two I/Os to find a leaf (resulting in a third I/O). So we would expect three I/Os to retrieve any given key value from this index: big_table@ORA11GR2> select id from big_table where id = 42; Execution Plan ---------------------------------------------------------0 SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1 Bytes=6) 1 0 INDEX (UNIQUE SCAN) OF 'BIG_TABLE_PK' (UNIQUE) (Cost=2 Card=1 Bytes=6) Statistics --------------------------------------------------------- 3 consistent gets 1 rows processed

The table is naturally clustered in order by the primary key (since the data is added in more or less that order). It will not be strictly clustered in order by the key, of course (we would have to use an IOT to achieve that), but in general rows with primary keys that are close in value will be close together in physical proximity. Now when you issue the query select * from T where primary_key between :x and :y the rows you want are typically located on the same blocks. In this case, an index range scan may be useful even if it accesses a large percentage of rows, simply because the database blocks that we need to read and reread will most likely be cached, since the data is co-located. On the other hand, if the rows are not co-located, using that same index may be disastrous for performance. A small demonstration will drive this fact home. We ll start with a table that is pretty much ordered by its primary key: ops$tkyte@ORA10G> create table colocated ( x int, y varchar2(80) ); Table created. ops$tkyte@ORA10G> begin 2 for i in 1 .. 100000 3 loop 4 insert into colocated(x,y) 5 values (i, rpad(dbms_random.random,75,'*') );

In Oracle Database 11g, all passwords are case sensitive by default. When you upgrade a database to the Oracle Database 11g release, however, passwords will continue to remain case insensitive, and you must use the ALTER USER statement to make these passwords case sensitive. The initialization parameter SEC_CASE_SENSITIVE_LOGON controls the password case sensitivity. By default, this parameter is set to true, meaning passwords are case sensitive by default. If for some reason you need to alter this default, say because one of your applications requires the use of caseinsensitive passwords, you can do so by setting the SEC_CASE_SENSITIVE_LOGON parameter to false.

big_table@ORA11GR2> select id from big_table where id = 12345; Statistics --------------------------------------------------------- 3 consistent gets 1 rows processed big_table@ORA11GR2> select id from big_table where id = 1234567; Statistics --------------------------------------------------------- 3 consistent gets 1 rows processed The B*Tree is an excellent general-purpose indexing mechanism that works well for large and small tables, and experiences little, if any, degradation in retrieval performance as the size of the underlying table grows.

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