android barcode scan javascript Managing the Oracle Instance in Software

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Managing the Oracle Instance
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Initialization parameters, as seen through Database Control
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it has not been set but it can be, by entering a value in the box in the column headed Value To change the static parameters, it is necessary to take the SPFile subtab, and make the changes there To change a parameters with SQL*Plus, use the ALTER SYSTEM command Figure 5-8 shows examples
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Changing and querying parameters with SQL*Plus
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The first query in Figure 5-8 shows that the values for the parameter DB_CREATE_ FILE_DEST are the same in the running instance in memory, and in the spfile on disk The next two commands adjust the parameter in both places to different values, but using the SCOPE keyword The results are seen in the second query The final command uses SCOPE=BOTH to change both the running and the stored value with one command This BOTH is the default, if the SCOPE is not specified
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An attempt to change a static parameter will fail unless the SCOPE is speci ed as SPFILEThe default SCOPE is
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BOTH the running instance and the sp le If the instance is started with a p le, then SCOPE=SPFILE will fail
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As was seen in 4, when a database instance is first created, it will be built with a pfile This needs to be converted to an spfile The command is
create spfile [='spfilename'] from pfile [='pfilename'];
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
create pfile [='pfilename'] from spfile [='spfilename'] ;
The CREATE PFILE and CREATE SPFILE commands can be run from SQL*Plus at any time, even before the instance has been started
The Basic Parameters
The instance parameters considered to be basic are those that should be considered for every database In some cases, the default will be fine but it should still be thought about To view the basic parameters and their current values, a query such as this will do:
select name,value from by name; v$parameter where isbasic='TRUE' order
A query that may give slightly different results is
select sname,svalue from v$spparameter s join v$parameter p on sname=pname where pisbasic='TRUE' order by name;
5:
Managing the Oracle Instance
The difference will be because some parameter changes may have been applied to the instance but not the spfile (or vice versa) The necessity for the join is because there is no column on V$SPPARAMETER to show whether a parameter is basic or advanced Table 5-1 summarizes the basic parameters
TABLE 5-1
The Basic Parameters
Parameter
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
Purpose
Is the database an 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 log files The default location for online redo log files 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 database with the same db_name are on the same machine Used to distinguish two 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 log files The destination for multiplexed copies of archived redo log files 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
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