read barcode from image javascript Initialization parameters, as seen through Database Control in Software

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Initialization parameters, as seen through Database Control
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3: Instance Management
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PART I
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Figure 3-2 Changing and querying parameters with SQL*Plus
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EXAM TIP An attempt to change a static parameter will fail unless the SCOPE is specified as SPFILE The default SCOPE is BOTH the running instance and the spfile If the instance is started with a pfile, then SCOPE=SPFILE will fail As was seen in 2, when a database instance is first created, it is built with a pfile This may be converted to an spfile using this command:
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create spfile [='spfilename'] from pfile [='pfilename'];
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If names are not given for spfilename or pfilename, then the default names based on the ORACLE_HOME and the SID will be assumed To reverse-engineer an spfile into a pfile, the command is
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create pfile [='pfilename'] from spfile [='spfilename'] ;
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The CREATE PFILE and CREATE SPFILE commands can be run from SQL*Plus at any time, even before the instance has been started
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The Basic Parameters
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The instance parameters considered to be basic are those that should be considered for every database In some cases, the default values will be fine but it is good practice to always consider the values of the basic parameters in your database The basic parameters and their current values may be queried using
select name,value from v$parameter where isbasic='TRUE' order by name;
A query that may give slightly different results is
select sname,svalue from v$spparameter s join v$parameter p on sname=pname where pisbasic='TRUE' order by name;
OCA/OCP Oracle Database 11g All-in-One Exam Guide
Any differences are because some parameter changes may have been applied to the instance but not the spfile (or vice versa) The necessity for the join is because there is no column on V$SPPARAMETER to show whether a parameter is basic or advanced Table 3-1 summarizes the basic parameters
Parameter Purpose
cluster_database compatible control_files db_block_size db_create_file_dest db_create_online_log_dest_1 db_create_online_log_dest_2 db_domain db_name db_recovery_file_dest db_recovery_file_dest_size db_unique_name instance_number job_queue_processes log_archive_dest_1 log_archive_dest_2 log_archive_dest_state_1 log_archive_dest_state_2 nls_language nls_territory open_cursors pga_aggregate_target processes Table 3-1 The Basic Parameters
Is the database a RAC or a single instance That this is basic indicates that RAC is considered a standard option The version that the instance will emulate Normally this would be the actual version, but it can look like older versions The name and location of the controlfile copies The default block size for formatting datafiles The default location for datafiles The default location for online redo logfiles The default location for online redo logfiles multiplexed copies The domain name that can be suffixed to the db_name to generate a globally unique name The name of the database (the only parameter with no default) The location of the flash recovery area The amount of data that may be written to the flash recovery area A unique identifier necessary if two databases with the same db_name are on the same machine Used to distinguish two or more RAC instances opening the same database Another indication that RAC is considered standard The number of processes available to run scheduled jobs The destination for archiving redo logfiles The destination for multiplexed copies of archived redo logfiles An indicator for whether the destination is enabled or not An indicator for whether the destination is enabled or not The language of the instance (provides many default formats) The geographical location of the instance (which provides even more default formats) The number of SQL work areas that a session can have open at once The total amount of memory the instance can allocate to PGAs The maximum number of processes (including session server processes) allowed to connect to the instance
3: Instance Management
Parameter Purpose
PART I
remote_listener
The addresses of listeners on other machines with which the instance should register; another parameter that is only relevant for a RAC Whether or not to use an external password file, to permit password file authentication Almost deprecated superseded by the UNDO parameters that follow The maximum number of sessions allowed to connect to the instance The size of the SGA, within which Oracle will manage the various SGA memory structures The number of shared server processes to launch, for sessions that are not established with dedicated server processes Whether to permit the optimizer to rewrite queries that join the dimensions of a fact table Whether undo data should be automatically managed in an undo tablespace, or manually managed in rollback segments If using automatic undo management, where the undo data should reside
remote_login_passwordfile rollback_segments sessions sga_target shared_servers star_transformation_enabled undo_management undo_tablespace Table 3-1
The Basic Parameters (continued)
All of these basic parameters, as well as some of the advanced parameters, are discussed in the appropriate chapters
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