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Test Code : 1Z0-041
Test designation : Oracle Database 10g: DBA Assessment
Vendor designation : Oracle
real questions : 68 actual Questions

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Oracle Database 10g: DBA Assessment exam

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

Introduction

All DBAs, at one time or another, agonize that their jobs will become obsolete if Oracle can provide on their covenant 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 region and on the identical time serve massive corporations where DBAs now believe to manage a entire bunch of divide servers and circumstances. In big agencies, Oracle thinks DBA resources will moreover be better utilized through being extra seasoned-actively concerned within the design and architecture of recent techniques in situation of panicking about existing ones which believe stopped working competently.

computerized Manageability elements

A self-management infrastructure would permit the database to study itself and employ this information to conform to workload adaptations and to immediately repair any lore issue. The assistance required to find out about advantage problems is in a persist save known as automatic Workload Repository. A DBA needs to accomplish positive that they believe got an organization understanding of 10g's measure 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 employ 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 limpid of users from putting non-equipment objects within the tablespace, it's, in prevalent, a Great commemorate for clients to steer limpid 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 region consumption policy. The latest volume of space occupied by means of each SYSAUX occupant will moreover 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 moreover 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 positive to employ privilege here tough guidelines. For a minute device, earmark 500MB. A gadget with 2 CPUs, ordinary of 10 lively* sessions, and 500 user objects (tables and indexes) is considered a minute gadget. For a medium size system, earmark 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 big system, earmark 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 dynamic session is a session it is executing a designation (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 evaluate of the measurement of SYSAUX when it reaches its equable state. that you could employ the SQL script UTLSYXSZ.sql in the $ORACLE_HOME/rdbms/admin directory to evaluate the volume of house necessary in SYSAUX tablespace, in response to the current configuration of the database (e.g., INTERVAL and RETENTION settings of AWR) and an extrapolation from the activities which believe been viewed for your database in view that it became created. gladden preserve in intellect that the UTLSYXSZ.sql does not suffer in intellect consumer objects that can be created in SYSAUX tablespace.
  • SQL> pick * from v$sysaux_occupants where occupant designation fancy '%AWR%';

    If the space used by using AWR is exhausted, they will slit 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 duty competently. now not having enough records can believe an outcome on the validity and accuracy of those components

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

    EXEC DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS (21600, 30);

    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 way is used.

    The snapshots are used for computing the expense 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 privilege 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 accommodate historic facts stored within the database.
  • AWR report: To generate a textual content record for various snapshot Ids, hasten the awrrpt.sql script at the SQL instantaneous:

    @$ORACLE_HOME/rdbms/admin/awrrpt.sql

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

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

    Enter expense for report_name: using the file designation awrrpt_1_100_120

    The workload repository file is consequently generated.

    under is a sample output of the AWR report.

    WORKLOAD REPOSITORY record for

    DB identify

    DB identity

    example

    Inst num

    unlock

    Cluster

    Host

    examine

    118468335

    look at various

    1

    10.1.0.four.0

    NO

    check-db.ora.hp

    Snap identity

    Snap Time

    classes

    Cursors/Session

    begin Snap:

    834

    11-Jul-06 01:27:31

    1732

    177.7

    conclusion Snap:

    836

    11-Jul-06 02:27:36

    2038

    196.3

    Elapsed:

    60.08 (mins)

    DB Time:

    381.35 (minutes)

    report summary

    Cache Sizes (conclusion)

    Buffer Cache:

    1,376M

    Std obscure dimension:

    8K

    Shared Pool size:

    1,856M

    Log Buffer:

    10,240K

    Load Profile

    Per second

    Per Transaction

    Redo measurement:

    2,389,415.27

    27,164.seventy six

    Logical reads:

    108,397.ninety seven

    1,232.35

    Block alterations:

    15,015.forty five

    a hundred and seventy.71

    actual reads:

    158.28

    1.eighty

    actual writes:

    247.04

    2.eighty one

    user calls:

    three,714.26

    42.23

    Parses:

    797.seventy six

    9.07

    hard parses:

    1.97

    0.02

    varieties:

    1,014.seventy nine

    eleven.fifty four

    Logons:

    0.77

    0.01

    Executes:

    7,300.46

    eighty three.00

    Transactions:

    87.ninety six

    % Blocks modified per study:

    13.85

    Recursive convene %:

    76.60

    Rollback per transaction %:

    22.64

    Rows per type:

    12.forty six

    instance efficiency Percentages (goal one hundred%)

    Buffer Nowait %:

    ninety nine.ninety nine

    Redo NoWait %:

    100.00

    Buffer Hit %:

    ninety nine.86

    In-reminiscence type %:

    a hundred.00

    Library Hit %:

    99.ninety eight

    tender Parse %:

    ninety nine.75

    Execute to Parse %:

    89.07

    Latch Hit %:

    ninety nine.fifty seven

    Parse CPU to Parse Elapsd %:

    eighty four.sixty four

    % Non-Parse CPU:

    ninety six.72

    Shared Pool facts

    start

    end

    reminiscence usage %:

    fifty one.28

    71.ninety nine

    % SQL with executions>1:

    eighty five.40

    ninety three.22

    % reminiscence for SQL w/exec>1:

    78.16

    85.seventy nine

    exact 5 Timed routine

    experience

    Waits

    Time(s)

    percent total DB Time

    Wait class

    CPU time

    17,107

    seventy four.seventy six

    db file sequential read

    498,214

    2,773

    12.12

    person I/O

    log file sync

    129,031

    2,010

    eight.seventy eight

    Commit

    log file parallel write

    445,391

    517

    2.26

    gadget I/O

    latch: library cache

    26,609

    141

    .62

    Concurrency

    AWR compare epoch record: AWR compare epoch 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 artery 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 moreover 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 map alterations over a length. This record will moreover be generated by artery of operating AWR SQRPT.sql

    automated equipment projects:

    Oracle Scheduler makes it feasible 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 map to spark off. A Scheduler job can then identify a window as its agenda. moreover, home windows can moreover be combined into window organizations, and if a job names a window neighborhood as its time table in its situation 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 limn the MAINTENANCE_WINDOW_GROUP in which any 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 hasten 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 any objects in the database for which there are no information or only stale statistics.

    if you pick to maneuver facts collections manually, then attain privilege 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 believe 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 hasten the angle consultant manually to achieve more up-to-the-minute options or to harvest innovations on segments that the computerized section advisor didn't check for feasible 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 slit back the suffuse 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 lead tasks. irrespective of what number of tasks are being computerized, it's vital to each massive and minute companies that there is at any times going to be a need for someone who is intimate with how the database server truly works, particularly the situation organizations thrust the database to its limits.

    » note any Articles by means of Columnist Sreeram Surapaneni


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