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Test Code : 1Z0-041
Test Name : Oracle Database 10g: DBA Assessment
Vendor Name : Oracle
: 68 Real Questions

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Oracle Database 10g: DBA Assessment exam

Oracle 10g: A Self Managed Database? | 1Z0-041 Real Questions and VCE Practice Test


All DBAs, at one time or another, agonize that their jobs will become obsolete if Oracle can provide on their promise to deliver a self-managing database. Oracle desires to penetrate into smaller-scale Oracle installations the place, in observe, no database tuning and upkeep takes area and on the same time serve massive corporations where DBAs now have to manage a whole bunch of separate servers and circumstances. In large agencies, Oracle thinks DBA resources will also be better utilized through being extra seasoned-actively concerned within the design and architecture of recent techniques in place of panicking about existing ones which have stopped working competently.

computerized Manageability elements

A self-management infrastructure would permit the database to study itself and use this information to adapt to workload adaptations and to immediately repair any knowledge issue. The assistance required to find out about advantage problems is in a persist save known as automatic Workload Repository. A DBA needs to make sure that they have got an organization understanding of 10g's standard Manageability Infrastructure before starting a evaluate of the particular person tuning advisors.

automated Workload Repository (AWR):

The MMON technique generates snapshots of performance facts once every hour and retains them in the database for 7 days. This information is each in reminiscence and stored in the database.

AWR collects and shops here statistics:

  • Wait routine (latch competition, buffer contention, and i/O contention) used to establish efficiency issues.
  • Time model records indicating the amount of DB time linked to a system from the V$SESS_TIME_MODEL and V$SYS_TIME_MODEL views.
  • energetic Session background (ASH) facts from the V$ACTIVE_SESSION_HISTORY view.
  • Some system and session information from the V$SYSSTAT and V$SESSTAT views.
  • Object entry and usage records.
  • aid intensive SQL statements
  • The monitoring and advisory tools listed below use these stats for advisory and reporting purposes.

  • automatic Database Diagnostic computer screen (ADDM)
  • SQL Tuning advisor
  • Undo advisor
  • segment guide
  • what is SYSAUX Tablespace?

    akin to the device tablespace, the SYSAUX tablespace is intended to save Oracle equipment objects. although the database will no longer steer clear of users from putting non-equipment objects within the tablespace, it's, in prevalent, a great observe for clients to steer clear of doing that. In Oracle 10g, there are round 20 occupants of the SYSAUX tablespace and one of them is automatic Workload repository (AWR). other occupants encompass Oracle Streams, LogMiner, and so on. each and every occupant has its own area consumption policy. The latest volume of space occupied by means of each SYSAUX occupant will also be received by means of querying the V$SYSAUX_OCCUPANTS view. The SPACE_USAGE_KBYTES column indicates the variety of Kbytes used by each and every of the occupants.

    Sizing the SYSAUX Tablespace:

    measurement estimates may also be got otherwise, in line with two following scenarios:

  • state of affairs X: you are growing a new SYSAUX tablespace (i.e., both throughout the creation of a brand new Oracle 10g database or migrating from a release earlier than Oracle 10g), be sure to use right here tough guidelines. For a small device, allocate 500MB. A gadget with 2 CPUs, ordinary of 10 lively* sessions, and 500 user objects (tables and indexes) is considered a small gadget. For a medium size system, allocate 2 GB of area. A gadget with 8 CPUs, ordinary of 20 lively periods, and 5,000 user objects (tables/indexes) is considered a mid-size equipment. For a large system, allocate 5 GB of house. A equipment with 32 CPUs, regular of one hundred lively sessions, and 50,000 person objects (tables/indexes) is considered a huge equipment. word: An active session is a session it is executing a name (i.e., doing work). this is now not to be confused with linked sessions, that are the variety of logons to the database.
  • situation Y: Your Oracle 10g database has been running for more than a day. during this case, that you can achieve a extra accurate estimate of the measurement of SYSAUX when it reaches its steady state. that you could use the SQL script UTLSYXSZ.sql in the $ORACLE_HOME/rdbms/admin directory to estimate the volume of house necessary in SYSAUX tablespace, in response to the current configuration of the database (e.g., INTERVAL and RETENTION settings of AWR) and an extrapolation from the activities which have been viewed for your database in view that it became created. Please keep in mind that the UTLSYXSZ.sql does not bear in mind consumer objects that can be created in SYSAUX tablespace.
  • SQL> choose * from v$sysaux_occupants where occupant name like '%AWR%';

    If the space used by using AWR is exhausted, they will cut back the space consumption via expanding the picture interval and reducing the retention period. When reducing the retention length, note that a number of Oracle self-managing facets rely upon AWR facts function competently. now not having enough records can have an effect on the validity and accuracy of those components

    The DBA can handle the interval and retention of picture technology through the dbms_workload_repository.modify_snapshot_settings system. for instance:


    In above illustration, the retention length is special as 15 days (21600 min) and the interval between each picture is 30 min.

    observe that taking manual snapshots is additionally supported in conjunction with the computerized snapshots that the system generates. For this, the dbms_workload_repository.create_snapshot method is used.

    The snapshots are used for computing the price of trade of a statistic. here's chiefly used for efficiency analysis. A photograph sequence numer (snap_id) identifies every picture, which is exciting inside the Workload Repository.

    customarily, the DBA would be able to view the AWR statistics through Oracle commercial enterprise supervisor or AWR stories. although, they are able to view the statistics by means of querying right here views as well.

  • V$ACTIVE_SESSION_HISTORY: This view shows the energetic database session recreation, sampled as soon as each 2nd.
  • V$ metric views give metric information to song the performance of the system. The metric views are organized into a lot of companies, comparable to experience, event type, device, session, service, file, and tablespace metrics. These organizations are recognized within the V$METRICGROUP view.
  • DBA_HIST views: The DBA_HIST views contain historic facts stored within the database.
  • AWR report: To generate a textual content record for various snapshot Ids, run the awrrpt.sql script at the SQL instantaneous:


    First, you should specify even if you need an HTML or a textual content file.

    Enter cost for report_type: text

    Specify the quantity days for which you are looking to list image Ids.

    Enter value for num_days: 2

    After the listing shows, you are triggered for the beginning and ending photograph id for the workload repository document.

    Enter price for begin_snap: a hundred Enter value for end_snap: 120

    next, settle for the default document name or enter a document name. The default identify is accredited in right here illustration:

    Enter price for report_name: using the file name awrrpt_1_100_120

    The workload repository file is consequently generated.

    under is a sample output of the AWR report.


    DB identify

    DB identity


    Inst num






    look at various





    Snap identity

    Snap Time



    begin Snap:


    11-Jul-06 01:27:31



    conclusion Snap:


    11-Jul-06 02:27:36




    60.08 (mins)

    DB Time:

    381.35 (minutes)

    report summary

    Cache Sizes (conclusion)

    Buffer Cache:


    Std Block dimension:


    Shared Pool size:


    Log Buffer:


    Load Profile

    Per second

    Per Transaction

    Redo measurement:


    27,164.seventy six

    Logical reads:

    108,397.ninety seven


    Block alterations:

    15,015.forty five

    a hundred and seventy.71

    actual reads:



    actual writes:


    2.eighty one

    user calls:




    797.seventy six


    hard parses:




    1,014.seventy nine

    eleven.fifty four






    eighty three.00


    87.ninety six

    % Blocks modified per study:


    Recursive call %:


    Rollback per transaction %:


    Rows per type:

    12.forty six

    instance efficiency Percentages (goal one hundred%)

    Buffer Nowait %:

    ninety nine.ninety nine

    Redo NoWait %:


    Buffer Hit %:

    ninety nine.86

    In-reminiscence type %:

    a hundred.00

    Library Hit %:

    99.ninety eight

    tender Parse %:

    ninety nine.75

    Execute to Parse %:


    Latch Hit %:

    ninety nine.fifty seven

    Parse CPU to Parse Elapsd %:

    eighty four.sixty four

    % Non-Parse CPU:

    ninety six.72

    Shared Pool facts



    reminiscence usage %:

    fifty one.28

    71.ninety nine

    % SQL with executions>1:

    eighty five.40

    ninety three.22

    % reminiscence for SQL w/exec>1:


    85.seventy nine

    exact 5 Timed routine




    percent total DB Time

    Wait class

    CPU time


    seventy four.seventy six

    db file sequential read




    person I/O

    log file sync



    eight.seventy eight


    log file parallel write




    gadget I/O

    latch: library cache





    AWR compare period record: AWR compare period record gives assessment of two photo periods. Output effects of this report are ordered with the aid of the statistical ameliorations between the periods. data are normalized by way of "DB time". AWR compare length file is generated through working AWRDDRPT.sql

    AWR ASH document: one of the most vital accessories of the AWR repository is the lively Session background (ASH), which collects each 2d samples of energetic classes (looking ahead to non-idle routine, or on the CPU working) from v$session (inactive sessions don't seem to be captured). When saved within the AWR repository, through default 1 in 10 samples of the ASH facts are saved persistently. This advice offers ADDM with the facts to drill-down on problems recognized. as an instance, for "db file scattered study" wait event, the ASH facts helps the advisor determine the particular blocks and data which are referenced essentially the most when the wait adventure became latest. Views to access counsel are v$active_session_history and dba_hist_acitve_session_history. ASH file will also be generated via operating ashrpot.sql, which gives precise evaluation of facts along time, session’s and so forth...

    AWR SQL detail report: This document gives the counsel about one or extra SQL statements over a picture range. here's very constructive principally for finding plan alterations over a length. This record will also be generated by way of operating AWR SQRPT.sql

    automated equipment projects:

    Oracle Scheduler makes it possible for a DBA to create time home windows, throughout which jobs are automatically run. a regular Scheduler window defines a birth time, duration, and optionally a resource plan to spark off. A Scheduler job can then identify a window as its agenda. moreover, home windows can also be combined into window organizations, and if a job names a window neighborhood as its time table in its place of naming a window, the job runs on every occasion any of the home windows in the window group opens.

    Two Scheduler home windows are predefined upon installation of Oracle Database:

  • WEEKNIGHT_WINDOW starts at 10 p.m. and ends at 6 a.m. each Monday via Friday.
  • WEEKEND_WINDOW covers complete days Saturday and Sunday.
  • together, these home windows represent the MAINTENANCE_WINDOW_GROUP in which all system preservation projects are scheduled. Oracle Database uses the preservation windows for automated information assortment, for space management, and for every other interior gadget renovation jobs.

    Predefined computerized system tasks

    the following jobs are among the many computerized device initiatives that are predefined to run in the protection windows:

    automatic facts assortment Job

    A Scheduler job, GATHER_STATS_JOB, is predefined upon installation of Oracle Database. GATHER_STATS_JOB collects optimizer information for all objects in the database for which there are no information or only stale statistics.

    if you choose to manipulate facts collections manually, then do right here:

    EXECUTE DBMS_SCHEDULER.DISABLE('GATHER_STATS_JOB'); automated segment advisor Job

    A Scheduler job, AUTO_SPACE_ADVISOR_JOB, is additionally predefined upon installing. AUTO_SPACE_ADVISOR_JOB runs the automatic segment consultant, which identifies segments that have house accessible for reclamation, after which makes innovations that you can view with enterprise manager or a set of PL/SQL package procedures.

    you could run the phase consultant manually to achieve more up-to-the-minute options or to reap innovations on segments that the computerized section advisor didn't check for possible house reclamation

    In conclusion:

    this article has mentioned two concepts which are an essential items of the server self manageability functionality, AWR and AST (automated system tasks). As you comprehend, these facets cut back the charge of managing the IT ambiance via tremendously decreasing configuration and intuitive day-to-day administration however does require a person who's regular with this structure. The power of cost reduction not enables the increase of a DBA's group of workers in the companies to preserve pace with database increase expense, which outcomes in what some consult with because the "management gap". DBAs want better tools that boost their productivity and aid automate many of their guide tasks. irrespective of what number of tasks are being computerized, it's important to each massive and small companies that there is at all times going to be a need for someone who is familiar with how the database server truly works, particularly the place organizations push the database to its limits.

    » See All Articles by means of Columnist Sreeram Surapaneni

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