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The REMOTE_LOGIN_PASSWORDFILE initialization parameter specifies whether Oracle checks for a password file for authentication purposes, and how many databases can use the password file. If you set the value to NONE, Oracle ignores any password file, and all privileged users must be authenticated by the operating system. If you use the SHARED value, Oracle will look for a password file to authenticate users, one or more databases can share the same password file, and it can contain names other than SYS. 11 shows how to create a password file. Default value: SHARED Parameter type: Static
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CHAPTER 9 CREATING AN ORACLE DATABASE
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Always ensure that the REMOTE_LOGIN_PASSWORDFILE parameter is set to SHARED. Otherwise, you ll be exposing the database to a major security weakness.
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Undocumented Initialization Parameters
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In addition to the initialization parameters listed in this chapter, Oracle has several undocumented initialization parameters. These parameters are not supposed to be altered in any way by regular users, and Oracle will not help you troubleshoot several kinds of problems that may occur if you use these undocumented and unsupported parameters. Once you gain sufficient experience, though, you will be able to make good use of some of these parameters. Listing 9-1 shows how to query for the list of undocumented initialization parameters. Listing 9-1. Query to List the Undocumented Oracle Parameters SQL> SELECT a.ksppinm parameter, a.ksppdesc description, b.ksppstvl session_value, c.ksppstvl instance_value FROM x$ksppi a, x$ksppcv b, x$ksppsv c WHERE a.indx = b.indx AND a.indx = c.indx AND SUBSTR (a.ksppinm,1,1) = '_' ORDER BY a.ksppinm; This query produced a list of 911 undocumented parameters for the Oracle Database 10g release.
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Viewing the Current Initialization Parameter Values
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How do you know what values the numerous initialization parameters are currently set to for your database The following sections describe several ways.
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Reading the init.ora File (or the SPFILE)
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You can always use a file editor such as Windows Notepad to examine init.ora files, not only to view the settings for initialization parameters, but also (at your own risk) to change their values. However, there is a major drawback to doing this: you cannot see the default values of all the initialization parameters. Remember that there are over 260 initialization parameters in Oracle Database 10g (10.2.0.0.0.) Release 2, and you will probably not set the values of more than a quarter of these parameters explicitly by using your init.ora file.
The V$PARAMETER View
A good and quick way to find out the initialization settings for your database is to query the V$PARAMETER view. You can run the following query to find out the values of all the parameters: SQL> SELECT name, value, isdefault FROM v$parameter; The isdefault column has a value of true if the parameter is the default value and yes if you actually set it to something other than the default value.
CHAPTER 9 CREATING AN ORACLE DATABASE
When I ran this command on my NT server, the output showed about 250 parameters. If you want to see only one or a set of related parameters and their values, you can add a WHERE clause to the previous SQL query.
The SHOW PARAMETER Command
Even though it s easy to query the V$PARAMETER view, there s a simpler means of querying the database about your initialization parameters. You can just type SHOW PARAMETER and you ll see all the initialization parameters with their values. You can also limit the vast amount of output by passing a keyword to SHOW PARAMETER. For example, the keywords LOCKS, FILES, LOG, and many others can be passed along to the SHOW PARAMETER command to get the values of a related set of parameters. (Note that the resulting list may not necessarily be a set of related parameters, as the command just uses a pattern search of the NAME column to pull the values from the V$PARAMETER table.) Listing 9-2 shows an example of the use of the SHOW PARAMETER command. Here, the output shows all initialization parameters that contain the string lock . Listing 9-2. Using the SHOW PARAMETER Command SQL> SHOW PARAMETER LOCK NAME -----------------------------db_block_buffers db_block_checking db_block_checksum db_block_size db_file_multiblock_read_count ddl_wait_for_locks distributed_lock_timeout dml_locks gc_files_to_locks lock_name_space lock_sga SQL> TYPE ------integer boolean boolean integer integer boolean integer integer string string boolean VALUE -------0 FALSE TRUE 8192 8 FALSE 60 400 FALSE
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