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However, the fact is that the decision to put column C1 before C2 must be driven by how the index is used If you have many queries like the following select * from t where c1 = :x and c2 = :y; select * from t where c2 = :y; it makes more sense to place the index on T(C2,C1) This single index could be used by either of the queries Additionally, using index key compression (which we looked at with regard to IOTs and will examine further later), we can build a smaller index if C2 is first This is because each value of C2 repeats itself, on average, four times in the index If C1 and C2 are both, on average, 10 bytes in length, the index entries for this index would nominally be 2,000,000 bytes (100,000 20).

The database will lock an account once the FAILED_LOGIN_ATTEMPTS limit is reached. However, the DBA can unlock a user s account at any time by using the following command: SQL> ALTER USER hr ACCOUNT UNLOCK; User altered. SQL>

Note Trailing NULL columns consume 0 bytes of storage in Oracle. This means that if the last column in a table is NULL, Oracle stores nothing for it. If the last two columns are both NULL, there will be nothing stored for either of them. But if any column after a NULL column in position is not null, then Oracle will use the null flag described in this section to indicate the missing value.

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Password aging policies, which ensure that users don t hang onto the same password for a long time, are a standard part of database security. Once a password expires, the user is forced to change it. You can make a password expire with the ALTER USER command, as shown here: SQL> ALTER USER hr IDENTIFIED BY hr PASSWORD EXPIRE; User altered. SQL> You can also make a password expire with the ALTER PROFILE command: SQL> ALTER PROFILE test_profile 2* LIMIT PASSWORD_LIFE_TIME 30; Profile altered. SQL> ALTER USER hr PROFILE test_profile; User altered. SQL> The preceding ALTER PROFILE statement limits the password life to 30 days, and you can gently remind the user about this by using another clause in your ALTER PROFILE statement, PASSWORD_ GRACE_TIME. Once you set the PASSWORD_GRACE_TIME clause as shown here, the first time the user logs in after the end of the password lifetime, the user will receive a warning that the password is about to expire in three days. If the user doesn t change the password within the grace period of three days, the password will expire. After the user s password expires, the password must be changed: SQL> CONNECT hr/hr ERROR: ORA-28001: the password has expired Changing password for hr New password: ** Retype new password: ** Password changed Connected. SQL>

Using index key compression on (C2, C1), we could shrink this index to 1,250,000 (100,000 125), since three out of four repetitions of C2 could be suppressed In Oracle 5 (yes, version 5!), there was an argument for placing the most selective columns first in an index It had to do with the way version 5 implemented index compression (not the same as index key compression) This feature was removed in version 6 with the addition of row-level locking Since then, it is not true that putting the most discriminating entries first in the index will make the index smaller or more efficient It seems like it will, but it will not With index key compression, there is a compelling argument to go the other way since it can make the index smaller However, it should be driven by how you use the index, as previously stated..

Oracle will let you choose how you want your privileged users to connect to the database. Privileged users are those users who can perform tasks such as starting up and shutting down the database. By default, only the SYS user has the SYSDBA and SYSOPER privileges, both of which are considered high-level privileges. The SYS user can grant these privileges to other users. Of course, any DBA who knows the SYS password can log in as SYS and perform the privileged tasks. However, by granting the critical privileges SYSDBA and SYSOPER explicitly to users, you force them to provide their username and password, which makes it easy to track the actions of privileged users. The REMOTE_LOGIN_PASSWORDFILE initialization parameter specifies whether Oracle checks for a password file.

If the length of the string is less than or equal to 250 (0x01 to 0xFA), Oracle will use 1 byte for the length. All strings exceeding 250 bytes in length will have a flag byte of 0xFE followed by 2 bytes that represent the length. So, a VARCHAR2(80) holding the words Hello World might look like Figure 12-1 on a block.

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