|Exam Name||:||Oracle Database 12c: Data Guard Administration|
|Questions and Answers||:||184 Q & A|
|Updated On||:||March 23, 2018|
|PDF Download Mirror||:||1Z0-066 Dump|
|Get Full Version||:||Pass4sure 1Z0-066 Full Version|
certainly one of huge records SQL’s key merits is that it leverages the top notch performance capabilities of Oracle Database 12c. i thought it could be pleasing for example an illustration – and during this case we’ll review a efficiency optimization that has been around for fairly ages and is used at hundreds of valued clientele: Materialized Views (MVs).
For those of you who're unfamiliar with MVs – an MV is a precomputed abstract desk. there's a defining query that describes that abstract. Queries that are achieved in opposition t the element tables comprising the summary could be automatically rewritten to the MV when applicable:
within the diagram above, we now have a 1B row fact table stored in HDFS that's being accessed through a large records SQL desk referred to as STORE_SALES. as a result of we know that users are looking to query the statistics using a product hierarchy (through item), a geography hierarchy (with the aid of location) and a combination (by using category & QTR) – we created three abstract tables that are aggregated to the acceptable tiers. as an instance, the “via item” MV has the following defining question:CREATE MATERIALIZED VIEW mv_store_sales_item ON PREBUILT desk permit question REWRITE AS ( choose ss_item_sk, sum(ss_quantity) as ss_quantity, sum(ss_ext_wholesale_cost) as ss_ext_wholesale_cost, sum(ss_net_paid) as ss_net_paid, sum(ss_net_profit) as ss_net_profit from bds.store_sales neighborhood by ss_item_sk );
Queries accomplished against the huge STORE_SALES that can be convinced by using the MV will now be immediately rewritten:select i_category, SUM(ss_quantity) FROM bds.store_sales, bds.item_orcl where ss_item_sk = i_item_sk AND i_size in ('small', 'petite') AND i_wholesale_cost > eighty neighborhood via i_category;
Taking a look on the question’s clarify plan, you could see that in spite of the fact that store_sales is the table being queried – the table that convinced the query is in fact the MV called mv_store_sales_item. The query changed into automatically rewritten by using the optimizer.
clarify plan with the MV:
clarify plan without the MV:
even if large facts SQL optimized the join and pushed the predicates and filtering all the way down to the Hadoop nodes – the MV dramatically enhanced question efficiency:
here's to be anticipated as we’re querying a significantly smaller and in part aggregated data. What’s best is that question didn't need to exchange; conveniently the introduction of the MV sped up the processing.
what is enjoyable right here is that the question selected records at the class degree – yet the MV is defined at the item degree. How did the optimizer know that there turned into a product hierarchy? And that category degree records may be computed from merchandise level statistics? The answer is metadata. A dimension object changed into created that defined the relationship between the columns:
CREATE DIMENSION BDS.ITEM_DIM stage merchandise IS (ITEM_ORCL.I_ITEM_SK) stage category IS (ITEM_ORCL.I_CLASS) stage category IS (ITEM_ORCL.I_CATEGORY) HIERARCHY PROD_ROLLUP ( item child OF class child OF category ) ATTRIBUTE merchandise DETERMINES ( ITEM_ORCL.I_SIZE, ITEM_ORCL.I_COLOR, ITEM_ORCL.I_UNITS, ITEM_ORCL.I_CURRENT_PRICE,I_WHOLESALE_COST );
here, you can see that gadgets roll up into type, and courses roll up into category. The optimizer used this counsel to enable the query to be redirected to the merchandise stage MV.
a pretty good observe is to compute these summaries and store them in Oracle Database tables. youngsters, there are alternatives. for example, you may have already computed abstract tables and saved them in HDFS. that you would be able to leverage these summaries by using creating an MV over a pre-developed huge facts SQL table. believe right here instance the place a summary table turned into defined in Hive and known as csv.mv_store_sales_qtr_class. There are two steps required to leverage this summary:
Let’s seem on the details. First, create the massive statistics SQL table over the Hive source (and don’t overlook to collect facts!):
CREATE table MV_STORE_SALES_QTR_CLASS ( I_CLASS VARCHAR2(one hundred) , SS_QUANTITY number , SS_WHOLESALE_COST number , SS_EXT_DISCOUNT_AMT number , SS_EXT_TAX number , SS_COUPON_AMT quantity , D_QUARTER_NAME VARCHAR2(30) ) corporation exterior ( type Oracle_HIVE DEFAULT directory DEFAULT_DIR entry PARAMETERS ( com.Oracle.bigdata.tablename: csv.mv_store_sales_qtr_class ) ) REJECT limit limitless; -- acquire facts exec DBMS_STATS.GATHER_TABLE_STATS ( ownname => '"BDS"', tabname => '"MV_STORE_SALES_QTR_CLASS"', estimate_percent => dbms_stats.auto_sample_size, diploma => 32 );
next, create the MV over the massive records SQL table:CREATE MATERIALIZED VIEW mv_store_sales_qtr_class ON PREBUILT table WITH reduced PRECISION permit question REWRITE AS ( choose i.I_CLASS, sum(s.ss_quantity) as ss_quantity, sum(s.ss_wholesale_cost) as ss_wholesale_cost, sum(s.ss_ext_discount_amt) as ss_ext_discount_amt, sum(s.ss_ext_tax) as ss_ext_tax, sum(s.ss_coupon_amt) as ss_coupon_amt, d.D_QUARTER_NAME from DATE_DIM_ORCL d, ITEM_ORCL i, STORE_SALES s where s.ss_item_sk = i.i_item_sk and s.ss_sold_date_sk = date_dim_orcl.d_date_sk neighborhood by using d.D_QUARTER_NAME, i.I_CLASS );
Queries towards STORE_SALES that may also be convinced with the aid of the MV can be rewritten:
right here, the following query used the MV:- what's the quarterly efficiency with the aid of category with each year totals?choose i.i_category, d.d_year, d.d_quarter_name, sum(s.ss_quantity) volume from bds.DATE_DIM_ORCL d, bds.ITEM_ORCL i, bds.STORE_SALES s where s.ss_item_sk = i.i_item_sk and s.ss_sold_date_sk = d.d_date_sk and d.d_quarter_name in ('2005Q1', '2005Q2', '2005Q3', '2005Q4') neighborhood by way of rollup (i.i_category, d.d_year, d.D_QUARTER_NAME)
And, the question returned in a little greater than a 2nd:
looking at the explain plan, you can see that the query is accomplished towards the MV – and the external table access (STORAGE FULL) shows that large records SQL sensible Scan kicked in on the Hadoop cluster.
MVs inside the database will also be instantly updated by using trade monitoring. however, within the case of large information SQL tables, the records isn't resident in the database – so the database does not comprehend that the summaries are modified. Your ETL processing will deserve to make certain that the MVs are saved up to this point – and you may deserve to set query_rewrite_integrity=stale_tolerated.
MVs are an ancient pal. they've been used for years to speed up performance for ordinary database deployments. they are an outstanding device to use in your huge statistics deployments as well!
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by using Joel Pérez and Skant Gupta
in this article, we are able to show you the way to fail over and reinstate Oracle Database in the cloud.
observe: to make use of the process presented in this article, you want two Oracle Cloud database cases. also, the system presented become carried out on Oracle Database 11g; besides the fact that children, the manner should work on later releases comparable to Oracle Database 12c unlock 1 and unlock 2.Create the simple Database illustration
- For provider name enter simple.- From the provider level list, choose Oracle Database Cloud provider.- From the Metering Frequency listing, select anything frequency is acceptable in your environment.- From the utility unencumber listing, select Oracle Database 11g free up 2.- From the software edition record, select enterprise edition.- From the Database class listing, opt for Single illustration.
Then click next to proceed.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842668.gif" alt="Figure 1 Creating a new service"/>
determine 1. developing a new service
- For DB identify (SID), enter ORCL.- Set an administrative password of your option and confirm the password (this may be your sys password).- For Usable Database Storage (GB), enter 25.- From the Compute shape list, opt for OC3 -1 OCPU, 7.5GB RAM (here is the naked minimum required).- For SSH Public Key, enter rsa-key-20170111.pub.
Then click next to continue.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842669.gif" alt="Figure 2 Specifying the service details"/>
figure 2. Specifying the service details
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842670.gif" alt="Figure 3 Creating primary cloud db instance"/>
determine three. developing the simple cloud database example
After a couple of minutes, the basic cloud database illustration has been created efficaciously.Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842671.gif" alt="Figure 4 Primary database created"/>
figure 4. The fundamental database has been created
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842672.gif" alt="Figure 5 Main page of primary database"/>
determine 5. leading page of the primary database
a. Open the database provider and select access guidelines from the menu.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842673.gif" alt="Figure 6 Selecting the Access Rules item"/>
figure 6. making a choice on the entry guidelines merchandiseb. For the ora_p2_dblistener rule, select permit from the moves menu.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842674.gif" alt="Figure 7 Enabling the ora_p2_dblistener"/>
figure 7. Enabling the ora_p2_dblistener rule
- For service identify enter Standby.- From the provider degree listing, choose Oracle Database Cloud provider.- From the Metering Frequency listing, choose whatever thing frequency is acceptable on your atmosphere.- From the software unencumber record, choose Oracle Database 11g unencumber 2.- From the software edition listing, select enterprise version.- From the Database category checklist, select Single instance.
Then click subsequent to continue.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842675.gif" alt="Figure 8 Creating another new service"/>
determine 8. developing an extra new carrier
- For DB identify (SID), enter ORCL.- Set an administrative password of your choice and ensure the password (this will be your sys password).- For Usable Database Storage (GB), enter 25.- From the Compute form checklist, select OC3 -1 OCPU, 7.5GB RAM (here is the naked minimal required).- For SSH Public Key, enter rsa-key-20170111.pub.
click subsequent to continue.
observe: This dummy database can be dropped later.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842676.gif" alt="Figure 9 Specifying service details"/>
figure 9. Specifying the service particulars
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842678.gif" alt="Figure 10 Creating standby DB instance"/>
figure 10. growing the standby cloud database instance
After a few minutes, the standby cloud database instance has been created effectively.Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842679.gif" alt="Figure 11 standby database created"/>
determine eleven. The standby database has been created
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842680.gif" alt="Figure 12 Main page standby DB"/>
figure 12. main page of the standby database
a. Open the database provider and select access suggestions from the menu.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842681.gif" alt="Figure 13 Selecting the Access Rules"/>
determine 13. deciding upon the entry guidelines itemb. For the ora_p2_dblistener rule, choose allow from the movements menu.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842682.gif" alt="Figure 14 Enabling the ora_p2_dblistener"/>
figure 14. Enabling the ora_p2_dblistener rule
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842684.gif" alt="Figure 15 Connecting to both machines using PuTTY"/>
figure 15. Connecting to both machines the use of PuTTY
notice: In the following figures, the basic illustration is shown with a black background and the standby example is proven with a yellow background.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842685.gif" alt="Figure 16 Checking the host names"/>
figure sixteen. Checking the host names and pmon tactics
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842686.gif" alt="Figure 17 Dropping the standby database"/>
figure 17. shedding the standby database
within the next steps, you're going to re-create the standby database manually
additionally, because you'll should configure the data look after broking service in an upcoming step, add a static entry for its command-line interface (DGMGRL) in the listener.ora file on each the primary and standby servers. (The statistics safeguard broking service is a allotted administration framework offered via Oracle Database, enterprise version.)SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = STBY_DGMGRL) (Oracle_HOME = /u01/app/Oracle/product/eleven.2.0/dbhome_1) (SID_NAME = STBY) ) (SID_LIST = (SID_DESC = (GLOBAL_DBNAME = STBY) (Oracle_HOME = /u01/app/Oracle/product/eleven.2.0/dbhome_1) (SID_NAME = STBY) ) ) LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (tackle = (PROTOCOL = TCP)(HOST = Standby.compute-aeetisalat78358.Oraclecloud.internal)(PORT = 1521)) (handle = (PROTOCOL = IPC)(KEY = EXTPROC1521)) ) )
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842687.gif" alt="Figure 18 Configuring the listener"/>
figure 18. Configuring the listener.ora data
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842688.gif" alt="Figure 19 Restarting the listener"/>
figure 19. Restarting the listener
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842689.gif" alt="Figure 20 Verifying the configuration"/>
determine 20. Verifying the configuration of the tnsnames.ora files
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842712.gif" alt="Figure 21 Running the tnsping command"/>
determine 21. working the tnsping command
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842713.gif" alt="Figure 22 Creating directories "/>
determine 22. creating directories on the standby computing device
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842714.gif" alt="Figure 23 Starting the standby database"/>
determine 23. beginning the standby database and checking the connections
After a while, the standby database is created and operating within the set up state.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842715.gif" alt="Figure 24 Standby database running"/>
determine 24. Standby database operating in the installed state
On the simple:create desk test as opt for * from dict;
On the standby:alter database open; ALTER equipment SET LOG_ARCHIVE_DEST_1='vicinity=/u01/app/Oracle/archive VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=STBY'; ALTER device SET LOG_ARCHIVE_DEST_2= 'carrier=ORCL LGWR ASYNC verify VALID_FOR=(ONLINE_LOGFILES, PRIMARY_ROLE) DB_UNIQUE_NAME=ORCL' scope=both; get well managed standby database using existing logfile disconnect;
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842716.gif" alt="Figure 25 Opening the standby database"/>
determine 25. Opening the standby database and starting the restoration
Failover is the technique of activating the standby database in case the construction (primary) database is deformed with a purpose to reduce the possibility of facts loss. It is not reversible. When the failover system is enabled, the standby database is switched to characteristic because the basic database and also you would should re-create the standby database.
In a worst-case circumstance when the information protect fundamental database is not accessible for construction, you could set off the standby database to be the basic construction database via performing the following steps.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842717.gif" alt="Figure 26 Activating the standby database"/>
determine 26. Activating the standby database
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842718.gif" alt="Figure 27 Re-creating old primary database"/>
figure 27. Manually re-developing the historical fundamental database
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842719.gif" alt="Figure 28 Starting old primary database "/>
figure 28. beginning the historical primary database and reinstating it
After some time, the historical fundamental database is re-created as the standby database and it is running within the hooked up state.Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842720.gif" alt="Figure 29 primary database mounted state"/>
determine 29. old simple database working within the hooked up state
On the basic:SQL> alter database open examine only; SQL> improve managed standby database using present logfile disconnect; SQL> choose count number(*) from check; count number(*) ---------- 0 SQL> opt for identify,db_unique_name,database_role,open_mode from v$database; identify DB_UNIQUE_NAME DATABASE_ROLE OPEN_MODE --------- ------------------------------ ---------------- -------------------- ORCL ORCL actual STANDBY read most effective WITH observe
On the standby:SQL> select count(*) from verify; count number(*) ---------- 2666 SQL> delete from examine; 2666 rows deleted. SQL> commit; Commit comprehensive. SQL> opt for count(*) from check; count number(*) ---------- 0
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842724.gif" alt="Figure 30 Opening the standby database"/>
determine 30. Opening the standby database and beginning the restoration
Hardware crashes have develop into very typical at the moment. it's why creating a catastrophe recuperation (DR) configuration for facts shelter is awfully effective for every database, despite its size. however the dimension of the database defines the device a DBA can use to re-create the simple database and install the DR configuration.
If database is somewhat small, doing an easy "bloodless reproduction" the use of the Oracle RMAN duplicate command is decent satisfactory. however, in the case of huge information warehouses or information marts, doing that takes too long. therefore, it is advised to reinstate standby databases by using the Oracle Flashback Database ability of Oracle Database.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842725.gif" alt="Figure 31 Results of starting flashback"/>
determine 31. consequences of beginning the flashback technology on each machines
next, we can configure the information shield broker.
listed here are the primary and standby database server details:simple server: fundamental.compute-aeetisalat78358.Oraclecloud.internalDatabase: ORCL
Standby server: StandBy-1.compute-aeetisalat78358.Oraclecloud.internalDatabase: STBY1
a. permit the broker system through surroundings the value of the parameter DG_BROKER_START to real.ALTER equipment SET DG_BROKER_START=authentic SCOPE=both;
b. make certain that the listener.ora file on both servers has a static entry for the DGMGRL command-line interface. (This changed into introduced previous in step 9.)
c. On the simple server, create the facts protect broking service configuration by way of working the statements:DGMGRL> CREATE CONFIGURATION 'Cloud DG' as primary DATABASE IS'ORCL' attachIDENTIFIER IS 'ORCL'; Configuration "CloudDG" created with primary database "ORCL" DGMGRL> reveal CONFIGURATION Configuration - CloudDG coverage Mode :MaxPerformance members: ORCL - fundamental database fast-birth Failover:DISABLED Configuration repute: DISABLED
d. Add the standby database to the configuration by means of running here statements:DGMGRL> ADD DATABASE 'STBY' as join IDENTIFIER IS 'STBY'; Database "STBY" introduced DGMGRL> exhibit CONFIGURATION Configuration - CloudDG coverage Mode :MaxPerformance Databases: ORCL - primary database STBY - actual standby database fast-start Failover:DISABLED Configuration reputation: DISABLED
e. allow the configuration through operating right here statements:DGMGRL> enable CONFIGURATION Enabled. DGMGRL> reveal CONFIGURATION Configuration - CloudDG protection Mode: MaxPerformance Databases: ORCL - simple database STBY - actual standby database fast-birth Failover: DISABLED Configuration repute: SUCCESS
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842726.gif" alt="Figure 32 Results of enabling broker"/>
determine 32. consequences of enabling the broking service
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842727.gif" alt="Figure 33 State of the primary database"/>
determine 33. State of the basic database after is it crashed
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842728.gif" alt="Figure 34 Performing a failover"/>
figure 34. Performing a failover
word: Now the standby database becomes the fundamental database.
as a result of we have Oracle Flashback Database already configured, which you could use right here command to reinstate database with out restoring the backup:DGMGRL> reinstate database 'ORCL';
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842729.gif" alt="Figure 35 Reinstating the database"/>
determine 35. Reinstating the database
Failing which we would were required to configure flashback database in an effort to reinstate the database automatically. As figure 35 suggests, the reinstate project failed because flashback is not configured to reinstate automatically throughout the Reinstate Database <DB identify> command.
Oracle.com/ocom/groups/public/@otn/documents/digitalasset/3842730.gif" alt="Figure 36 Performing a switchover operation"/>
figure 36. Performing a switchover operation
So now you understand that it is very convenient to perform a failover over the cloud with and without the use of Oracle Flashback Database.
We hope this article is valuable and we invite you to continue reading our next publications concentrated on Oracle Cloud.about the Authors
Joel Pérez is an authority DBA and Oracle ACE Director and an Oracle licensed master in Oracle highest Availability architecture, Oracle Database cloud administration, and Oracle Database 11g and12c. He has over 17 years of precise-world experience with Oracle technology and specializes within the design and implementation of solutions for the cloud, excessive availability (HA), catastrophe restoration, improvements, replication, and most areas concerning Oracle Database. presently, he works as chief technologist and architect for cloud technologies, Oracle maximum Availability architecture, and HA at Yunhe Enmo (Beijing) technology Co., Ltd. in Beijing, China.Skant Gupta is an Oracle licensed Cloud skilled in Oracle Database 12c, an Oracle certified knowledgeable in Oracle true application Clusters (Oracle RAC) in Oracle Database 11g, and an Oracle certified expert in Oracle Database 10g, 11g, and 12c. He works at Vodafone technology in the UK and previously labored as a senior DBA at Etisalat in Dubai. He has six years of event with quite a few Oracle technologies, focusing particularly on cloud, database, and high availability solutions, Oracle WebLogic Suite, and Oracle GoldenGate. He has presented at a couple of Oracle user businesses worldwide, most lately in the US, the United Arab Emirates, and India.
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1Z0-066 Certification Brain Dumps Source : Oracle Database 12c: Data Guard Administration
Test Code : 1Z0-066
Test Name : Oracle Database 12c: Data Guard Administration
Vendor Name : Oracle
Q&A : 184 Real Test Questions/Answers
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