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USER_ID PASSWORD ACCOUNT_STATUS LOCK_DATE EXPIRY_DATE DEFAULT_TABLESPACE TEMPORARY_TABLESPACE CREATED PROFILE INITIAL_RSRC_CONSUMER_GROUP EXTERNAL_NAME SQL>

The result cache is always enabled by default, and its size depends on the memory the database allocates to the shared pool. If you specify the MEMORY_TARGET parameter for allocating memory, Oracle allocates 0.25% of the MEMORY_TARGET parameter value to the result cache. If you specify the SGA_TARGET parameter instead, Oracle allocates 0.5% of the SGA_TARGET value to the result cache. You can change the memory allocated to the result cache by setting the RESULT_CACHE_MAX_SIZE initialization parameter. This parameter can range from a value of zero to a system-dependent maximum. You disable result caching by setting the parameter to zero, as shown here:

NOT NULL NUMBER VARCHAR2(30) NOT NULL VARCHAR2(32) DATE DATE NOT NULL VARCHAR2(30) NOT NULL VARCHAR2(30) NOT NULL DATE NOT NULL VARCHAR2(30) VARCHAR2(30) VARCHAR2(4000)

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SQL> ALTER SYSTEM SET result_cache_max_size=0; Since result caching is enabled by default, it means that the RESULT_CACHE_MAX_SIZE parameter has a positive default value as well, based on the size of the MEMORY_TARGET parameter (or the SGA_TARGET parameter if you have that parameter instead). In addition to the RESULT_CACHE_MAX_SIZE parameter, two other initialization parameters have a bearing on the functioning of the result cache: the RESULT_CACHE_MAX_RESULT parameter specifies the maximum amount of the result cache a single result can use. By default, a single cached result can occupy up to 5 percent of the result cache, and you can specify a percentage between 1 and 100. The RESULT_CACHE_REMOTE_EXPIRATION parameter determines the length of time for which a cached result that depends on remote objects is valid. By default, this parameter is set to zero, meaning you aren t supposed to use the result cache for queries involving remote objects. The reason for this is over time remote objects could be modified, leading to invalid results in the cache.

You can use the DBA_USERS view to find out the profile, temporary tablespace, or default tablespace assigned to users. Although there s a PASSWORD column, you can t find out the password, because the password is encrypted. There are two ways you can log in as a user if you don t know the user s password. First, you can simply change the user s password by using the ALTER USER command. However, this permanently changes the user s password, which may not be what you want to do. The following example shows the other way to log in as a different user without knowing that user s password. (In this case, the user is called hr. ) First, find out the encrypted version of hr s password: SQL> SELECT password FROM DBA_USERS 2 WHERE username='HR'; PASSWORD -----------------------------4C6D73C3E8B0F0DA SQL> Second, alter hr s password: SQL> ALTER USER hr IDENTIFIED BY new_pass; User altered. SQL> Third, when you re done using hr s username and you want to change the password to its original (unknown) version, use the following statement: SQL> ALTER USER hr IDENTIFIED BY VALUES '4C6D73C3E8B0F0DA'; User altered.

Whether the database caches a query result or not depends on the value of the RESULT_CACHE_MODE initialization parameter, which can take two values: MANUAL or FORCE. Here s how the two values affect result caching behavior in the database: If you set the parameter to FORCE, the database will try to use the cache for all results, wherever it s possible to do so. You can, however, skip the cache by specifying NO_RESULT_CACHE hint within a query. If you set the parameter to MANUAL, the database caches the results of a query only if you include the RESULT_CACHE hint in the query. By default, the RESULT_CACHE_MODE parameter is set to MANUAL and you can change the value dynamically as shown here: SQL> alter session set result_cache_mode=force scope=spfile;

The DBA_PROFILES view provides information about user profiles. You ll find out that this view is one of your most important aids in managing user resource allocation. Two important values under the RESOURCE_TYPE column are KERNEL and PASSWORD. Here s the structure of this view: SQL> DESC DBA_PROFILES Name ----------------------------------------PROFILE RESOURCE_NAME RESOURCE_TYPE LIMIT SQL> Null -------NOT NULL NOT NULL Type ------------VARCHAR2(30) VARCHAR2(32) VARCHAR2(8) VARCHAR2(40)

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