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The parameter controls the automatic gathering of statistics at two levels: statistics accumulated within the instance regarding activity and object statistics within the database The instance statistics are accumulated in memory and flushed to the Automatic Workload Repository (the AWR) by the MMON (Manageability Monitor) background process The object statistics are those gathered by analyzing objects with DBMS_STATS procedure calls The default is setting is TYPICAL, which will be suitable for most databases in normal running mode The TYPICAL setting will gather all the statistics needed by the self-management and tuning capabilities of the database and will also enable the automatic object analysis task that runs daily in the maintenance window The BASIC setting disables computation of AWR statistics and disables the daily analysis With this setting, the various performance and tuning advisors will not be available, and the alert system will not function The ALL setting gathers all possible statistics These include operating system activity statistics and very detailed statistics on SQL statement execution It is possible that gathering statistics at this level will impact adversely on performance

TYPICAL will gather all the statistics that any normal human being needs, but none whose gathering would make the database run more slowly BASIC cripples your tuning ability and delivers no performance benefit ALL should be enabled for short periods when you are actively tuning SQL statements Usually, leave STATISTICS_LEVEL on default

In this exercise, you will use various techniques for gathering optimizer statistics 1 Connect to your database as user SYSTEM with SQL*Plus 2 Create a table and an index to be used for the exercise, and set your session s date format:

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6 Check middleware If all the local devices can communicate across the network properly but your reads are not registering in your back-end systems, you need to look at the other end of these connections If a middleware client is placed behind these readers, make sure that it is running Just as you did with the IZ equipment, reboot it! A full server reboot may not be feasible, but you can certainly restart the service

These are the many business strategies and related technologies for controlling intellectual property rights in digital and traditional media

create table st as select * from all_users; create index sti on st(username); alter session set nls_date_format='dd-mm-yy hh24:mi:ss';

3 Investigate the statistics on the table and indexes:

select count(*) from st; select num_rows,last_analyzed from user_tables where table_name='ST'; select distinct_keys,last_analyzed from user_indexes where index_name='STI';

controlling this package to ensure that no corrupt data has interrupted it If this resolves the problem, be sure to check the log files to see what the last event prior to the failure was so you can perform root cause analysis 7 Check enterprise resource planning (ERP), warehouse management systems (WMS), and Transaction Processing (TP) systems connections After you have tested the middleware and verified that it functions as it should, check the connections to the back-end system to ensure that they are functional Typically, installed systems will have a status monitor that indicates failure should one exist Sometimes you can run a test script that will emulate data coming from the reader to ensure that the back-end system shows the proper results If you encounter problems, restart the service (reboot) and see if the problem persists As before, always check the logs to find the last event prior to failure to perform root cause analysis After completing these steps, most problems should be resolved

The advent of digital devices has created an intellectual property crisis Is it possible to control the spread of something that can be infinitely copied without loss and at no cost Even traditional media are not safe Anything can be scanned or otherwise converted to a digital equivalent The doom cries of the multibillon-dollar media companies are making Chicken Little seem optimistic in comparison What s that Are those war-drums banging in the distance Digital rights management (DRM) is a business approach to controlling the distribution of valuable information across all forms of media The strategy is to manage and enforce intellectual property rights through a combination of technology and law Creating and maintaining a protected yet accessible environment for valuable content is fundamental to successful digital rights management

Note that the statistics count of the rows in the table is wrong, because the table has never been analyzed The number of distinct values recorded in the index is reported correctly (for now), because indexes are automatically analyzed on creation 4 Analyze the table using the ANALYZE command:

analyze table st compute statistics;

5 Rerun the queries from Step 3 All the figures are now correct 6 Insert some more rows into the table:

.

insert into st select * from st;

Be aware that if the RFID equipment follows the RF emission regulations, the damage it can cause to a human body during operation and handling is not likely to be due to radiation but rather due to electric shock

7 Rerun the queries from Step 3 Note that the statistics are wrong 8 Analyze the table with the DBMS_STATS API:

exec dbms_statsgather_table_stats('SYSTEM','ST');

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