Oracle DBALearn how to prepare for the Oracle DBA Certification and apply for Oracle DBA jobs.
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Oracle Database Administrators (DBAs) are responsible for the design, implementation, support and maintenance of Oracle databases in organizations.
The role includes installing, configuring, architecting, building and scaling databases for future data growth and capacity. Oracle DBAs are also responsible for security, performance and availability of data to users and customers.
This Oracle Database Administration training by Uplatz will help you master the Oracle DBA skills and will take a deep-dive into Oracle Database architecture, the database processes, memory structures, schema objects, security, data recovery and backup through hands-on projects and case studies.
In this Oracle DBA training, you will learn how to:
1) Create and manage an Oracle Database Instance
2) Create and manage Storage Structures
3) Configure the Oracle Network Environment
4) Create and manage users
5) Monitor the database and manage performance
6) Learn basic information on backup and recovery techniques
7) Use the Oracle Support Workbench and My Oracle Support to update your Oracle Database software
8) Gain an understanding of the Oracle Database Cloud Service.
This course will also help you prepare for the Oracle DBA Certification and apply for Oracle DBA jobs with an aim to make you a successful Oracle Database Administrator.
Course/Topic 1 - Architecture
This video comprehends the terms Oracle Database which is an object-relational database management system developed and marketed by Oracle Corporation. Oracle Database is commonly referred to as Oracle RDBMS or simply Oracle.
Course/Topic 2 - DBCA and Instance
This topic will cover, DBCA which can create Standby Databases directly, but with some restrictions, like only for Single Instance Databases and only non-container Databases.
Course/Topic 3 - Users
In this tutorial, you will learn how to use the Oracle create user statement to create a new user in the Oracle database. The create user statement allows you to create a new database user which you can use to log in to the Oracle database.
Course/Topic 4 - Managing Database Storage Structure
In this video you will learn about the an Oracle database which is made up of physical and logical structures. Physical structures can be seen and operated on from the operating system, such as the physical files that store data on a disk.
Course/Topic 5 - Undo
In this tutorial you will know about the Oracle Database creates and manages information that is used to roll back, or undo, changes to the database. Such information consists of records of the actions of transactions, primarily before they are committed. These records are collectively referred to as undo.
Course/Topic 6 - Flashback Technology
In this video you will learn about the Oracle Flashback Technology which is a group of Oracle Database features that let you view past states of database objects or to return database objects to a previous state without using point-in-time media recovery.
Course/Topic 7 - Oracle Networking Environment
In this tutorial you will learn about the installing Oracle Database, which is a fully functional database with a client/server network environment that has been minimally configured. This chapter helps you configure your server network.
Course/Topic 8 - Oracle Locking
In this tutorial we will learn about the Locking which protect table when several users are accessing the same table. Locking is a concurrency control technique in oracle. It helps in data integrity while allowing maximum concurrency access to data. Oracle offers automatic locking whenever situation requires.
Course/Topic 9 - Oracle Auditing
In this video tutorial you will learn about the Auditing which is the monitoring and recording of configured database actions, from both database users and non-data base users.
Course/Topic 10 - EM and Data Pump
In this session you will learn about the Oracle Data Pump technology which enables very high-speed movement of data and metadata from one database to another.
Course/Topic 11 - Backup and Recovery
This tutorial teaches you about the Backup and recovery procedures which protect your database against data loss and reconstruct the data, should loss occur. The reconstructing of data is achieved through media recovery, which refers to the various operations involved in restoring, rolling forward, and rolling back a backup of database files.
In this video you will learn about the backup recovery scheme which you devise for an Oracle database, operating system backups of the database's datafiles and control files are absolutely necessary as part of the strategy to safeguard against potential media failures that can damage these files.
This tutorial teaches you the Recovery processes which are dependent on the type of failure that occurred, the structures affected, and the type of recovery that you perform. If no files are lost or damaged, recovery may amount to no more than restarting an instance. If data has been lost, recovery requires additional steps.
This session teaches you the Recovery Manager (RMAN which is an Oracle Database client that performs backup and recovery tasks on your databases and automates administration of your backup strategies. It greatly simplifies backing up, restoring, and recovering database files.
Course/Topic 12 - Oracle Database Migration to Cloud
In this video you will learn about the Oracle offers which is a wide range of migration services to help you optimize your usage of Oracle technology. Through the use of tools, resources, and proven best practices, Oracle can provide support for migrating from legacy or non-Oracle technologies to Oracle.
• Installing Oracle Software
• Creating an Oracle Database Using DBCA
• Managing Database instances and ASM instances
• Managing and controlling database network environment
• Define and devise transaction management, concurrency control, crash recovery components • Managing storage structures
• Controlling user security
• Designing Database backup and recovery procedures
• Take Decisions related with Database Maintenance
· Tablespace and Storage
· Temporaray Tablespace
· Flashback Technology
· Oracle Networking Environment
· Oracle Locking
· Oracle Auditing
· EM and Data Pump
· User Managed Backup
· User Managed Recovery
· RMAN - Backup
· RMAN - Recovery
· Oracle Database Migration to Cloud
This Oracle DBA training course will help the participant to master the Oracle certified Database Administrator. As a part of this Oracle DBA training, the participants will master the oracle database architecture, database processes, security and backup.
In Oracle DBA Course module, the participants can understand the capability to provide industry support for online backup and data recovery. In the Oracle DBA course, the participants will learn to deal with large amount of data without any failure.
Oracle DBA Certification is an important level in becoming a Database Administrator. As a part of the Oracle DBA course training, the Oracle Database administrator get trained in database overview, PL/SQL and SQL concepts, oracle network configuration. Oracle DBA tutorial helps the participants to fulfil the role of a database administrator.
The Oracle DBA certification exam validates that the participants possess the basic concepts and skills a Database administrator should require for daily operation management and maintenance. Oracle Certification exams verifies the participants capabilities using situation-based questions that can access the participants ability to perform. The process of becoming Oracle certified database administrator expands the participants knowledge and skills by getting exposed to key database features.
Uplatz online training ensures the participants to successfully go through the Oracle DBA certification provided by Oracle. Uplatz provides appropriate teaching and expertise training is provided to equip the participants for implementing the learnt concepts in an enterprise.
Course Completion Certificate will be awarded by Uplatz upon the completion of the Oracle DBA course training.
Below given are the Certification details of Oracle Database 12C Administration
· Certification Level: Professional
· Exam Name: Oracle Database 12C Administration
· Exam Code: 1Z0-062
· Exam Mode: Online
· Total Number of Questions: 67
· Pass Score: 64%
· Time Duration: 120 Minutes
· Exam Price: $330
The Oracle Database Administrator draws an average salary of $120,266 per year depending on the knowledge and hands-on experience. The Oracle Database Administrator job roles are in high demand and make a rewarding career.
The Oracle Database Administrators have major demand in global-based companies and MNCs. The adoption of the Oracle database concepts in global companies can open up a job opportunity. The Global companies hire Oracle Database Administrator considering the skill of Oracle DBA management and maintenance. The Learners earn the most beneficial Oracle Database Administrator course completion certification through our training and course curriculum.
The Oracle DBA Certification course is ideally designed for developers, database administrators and data center support engineers who wants to become an Oracle certified database administrator.
After pursuing Oracle DBA certification course the participants can pursue a wide range of career paths.
The following are the job titles:
· Oracle DBA (Database Administrator)
· Oracle 12C Administrator
· Oracle Developer
· Oracle DBA Associate
· Database Engineer
Highly-skilled database professionals can manage any kind of critical systems. The Oracle certified Database Administrators are in high demand across the globe.
1) How many memory layers are in the shared pool?
The shared pool portion of the SGA contains three major areas: library cache(contains parsed sql statements,cursor information,execution plans), dictionary cache (contains cache -user account information,priveleges information,datafile,segment and extent information), buffers for parallel execution messages, and control structure.
2) How do you find out from the RMAN catalog if a particular archive log has been backed-up?
list archivelog all;
3) How can you tell how much space is left on a given file system and how much space each of the file system’s subdirectories take-up?
df -kh and du-sh
4) Define the SGA and:
i) How you would configure SGA for a mid-sized OLTP environment?
ii) What is involved in tuning the SGA?
SGA: The System Global Area (SGA) is a group of shared memory areas that are dedicated to an Oracle “instance” (an instance is your database programs and RAM). All Oracle processes use the SGA to hold information. The SGA is used to store incoming data (the data buffers as defined by thedb_cache_size parameter), and internal control information that is needed by the database. You control the amount of memory to be allocated to the SGA by setting some of the Oracle “initialization parameters”. These might include db_cache_size, shared_pool_size and log_buffer.
i) 40% of RAM can be used for sizing SGA rest is reserved for OS and others in 64 bit machine and in 32 bit machine max SGA configured can be 1.5GB only.
ii) Check the statspack report. Check hit ratio of Data buffer. If it is less than 90%, then we need to increase the Data buffer. Check hit ratio of Shared pool. If it is less than 95%, then we need to increase the Shared pool. Check log buffer. If redo buffer allocation retries/redo entries is greater than 1%, then we need to increase log_buffer.
5) What is the cache hit ratio, what impact does it have on performance of an Oracle database and what is involved in tuning it?
Buffer cache hit ratio: It calculates how often a requested block has been found in the buffer cache without requiring disk access. This ratio is computed using data selected from the dynamic performance view V$SYSSTAT. The buffer cache hit ratio can be used to verify the physical I/O as predicted by V$DB_CACHE_ADVICE.
sql> select name, value From v$sysstat Where name in (‘db block gets’, ‘consistent gets’, ‘physical reads’);
The cache-hit ratio can be calculated as follows: Hit ratio = 1 – (physical reads / (db block gets + consistent gets)) If the cache-hit ratio goes below 90% then: increase the initialisation parameter DB_CACHE_SIZE.
Library cache hit ratio: It calculates how often the parsed representation of the statement can be reused. It also known as soft parse.
sql> select namespace, pins, pinhits, reloads, invalidations from v$librarycache order by namespace;
Library Cache Hit Ratio = sum(pinhits) / sum(pins)
Dictionary cache hit ratio:It is a measure of the proportion of requests for information from the data dictionary, the collection of database tables and views containing reference information about the database, its structures, and its users. On instance startup, the data dictionary cache contains no data, so any SQL statement issued is likely to result in cache misses. As more data is read into the cache, the likelihood of cache misses should decrease. Eventually the database should reach a "steady state" in which the most frequently used dictionary data is in the cache.
6) Other than making use of the statspack utility, what would you check when you are monitoring or running a health check on an Oracle 8i or 9i database?
Daily Monitoring activities and check different logs for any sort of errors.
7) How do you tell what your machine name is and what is its IP address?
hostname, uname -n and ifconfig
8) How would you go about verifying the network name that the local_listener is currently using?
lsnrctl stat or ps-eaf|grep tns
9) You have 4 instances running on the same UNIX box. How can you determine which shared memory and semaphores are associated with which instance?
SQL> oradebug setmypid
SQL> oradebug ipc
Also you can check the spfile. The parameters will start with instance_name. parameter_name naming.
10) What view(s) do you use to associate a user’s SQLPLUS session with his o/s process?
v$process and v$session
sql> select a.spid from v$process a, v$session b where a.addr = b.addr and b.audsid=userenv(‘sessionid’);
11) What is the recommended interval at which to run statspack snapshots, and why?
Should be in minutes (15-20 mins approx) because where the time between the two snapshots is measured in hours, the events that caused serious performance issues for 20 minutes during peak processing don’t look so bad when they’re spread out over an 8-hour window. It’s also true with STATSPACK that measuring things over too long of a period tends to level them off over time. Nothing will stand out and strike you as being wrong.
12) What spfile/init.ora file parameter exists to force the CBO to make the execution path of a given statement use an index, even if the index scan may appear to be calculated as more costly?
13) Assuming today is Monday, how would you use the DBMS_JOB package to schedule the execution of a given procedure owned by SCOTT to start Wednesday at 9AM and to run subsequently every other day at 2AM.
dbms_job.submit(:jobno,'statspack.snap;',trunc(sysdate)+9/24,'trunc(SYSDATE+1/24,''HH'')', TRUE, :instno);
14) How would you edit your CRONTAB to schedule the running of /test/test.sh to run every other day at 2PM?
00 02 * * * /test/test.sh
15) In which dictionary table or view would you look to determine at which time a snapshot or MVIEW last successfully refreshed?
SQL> SELECT MVIEW_NAME,LAST_REFRESH_DATE from USER_MVIEWS;
16) How would you best determine why your MVIEW couldn’t FAST REFRESH?
Possibly by checking the MVIEW LOG for errors.
17) How would you begin to troubleshoot an ORA-3113 error?
End of File Communication Error. Check Alert Logfile. CheckNetwrok Latency. Check sqlnet.ora file has expire_time = 0, delete unwanted files and check the swap and temp spaces.
18) Which dictionary tables and/or views would you look at to diagnose a locking issue?
v$lock, v$session, v$process
19) An automatic job running via DBMS_JOB has failed. Knowing only that “it’s failed”, how do you approach troubleshooting this issue?
Check the log and possible reason for the JOB failed.
20) How would you extract DDL of a table without using a GUI tool?
select dbms_metadata.get_ddl('OBJECT','OBJECT_NAME') from dual;
21) You’re getting high “busy buffer waits” - how can you find what’s causing it?
Buffer busy wait means that the queries are waiting for the blocks to be read into the db cache.There could be the reason when the block may be busy in the cache and session is waiting for it. It could be undo, data block or segment header wait.
Run the following query to find out the p1,p2 and p3 of a session causing buffer busy wait
sql> select p1 "File #",p2 "Block #",p3 "Reason Code" from v$session_wait where event = 'buffer busy waits';
After that running the following query to find the segment causing buffer busy wait:-
sql> select owner,segment_name,segment_type from dba_extents where file_id = &P1 and &P2 between block_id and block_id + blocks -1;
22) What query tells you how much space a tablespace named “test” is taking up, and how much space is remaining?
SET SERVEROUTPUT ON
SET LINESIZE 1000
SET FEEDBACK OFF
rem column dummy noprintcolumn pct_used format 999.9 heading "%|Used"
column name format a25 heading "Tablespace Name"
column Kbytes format 999,999,999 heading "MBytes"
column used format 999,999,999 heading "Used(MB)"
column free format 999,999,999 heading "Free(MB)"
column largest format 999,999,999 heading "Largest"
break on report
compute sum of kbytes on report
compute sum of free on report
compute sum of used on report
set pagesize 100
nvl(a.tablespace_name,'UNKOWN')) name,(kbytes_alloc/1024) kbytes,
((kbytes_alloc-nvl(kbytes_free,0))/1024) used,(nvl(kbytes_free,0)/1024) free,
from ( select sum(bytes)/1024 Kbytes_free,
max(bytes)/1024 largest, tablespace_name
from sys.dba_free_space group by tablespace_name ) a,
( select sum(bytes)/1024 Kbytes_alloc, tablespace_name
from sys.dba_data_files group by tablespace_name )b
where a.tablespace_name (+) = b.tablespace_name
order by 1
23) Database is hung. Old and new user connections alike hang on impact. What do you do? Your SYS SQLPLUS session is able to connect.
Log into the system and find whether there are any deadlocks in the system using the following query.
select 'SID ' || l1.sid ||' is blocking ' || l2.sid blocking
from v$lock l1, v$lock l2
where l1.block =1 and l2.request > 0
If so kill the processes caught in deadlock
alter system kill session 'SID,SERIAL#' immediate;
Also find out which wait events exist in the system using following commands and go in detail as to what events are causing these waits and take appropriate actions.
select event,count(*) from v$session group by event
select u.sid,u.serial#, u.username,p.spid,to_char(u.logon_time,'DD-MON-YYYY:HH24:MI:SS') from v$session u, v$session w,v$process p where u.sid = w.sid and w.event like '%&a%' and u.paddr = p.addr
24) Database crashes. Corruption is found scattered among the file system neither of your doing nor of Oracle’s. What database recovery options are available? Database is in archive log mode.
First of all secure all the archives and all the backups you have on the tape or other system. Then run fschk to check the filesystem. If the corruption is detected at the filesystem level and is not recoverable by fschk format the file system and restore the database through RMAN.
25) How do you increase the OS limitation for open files (LINUX and/or Solaris)?
Set the file-max parameter is /etc/sysctl.conf to the number you want.Save the file and execute it by using command /etc/sysctl.conf-p
26) Provide an example of a shell script which logs into SQLPLUS as SYS, determines the current date, changes the date format to include minutes & seconds, issues a drop table command, displays the date again, and finally exits.
sqlplus sys as sysdba << EOF
Now the contents of /oracle/date.sql
select SYSDATE from dual;
select to_char(SYSDATE,'dd-mon-yyyy hh24:mi:ss') from dual;
drop table tablename cascade constraints;
select to_char(SYSDATE,'dd-mon-yyyy hh24:mi:ss') from dual;
27) Explain how you would restore a database using RMAN to Point in Time?
until time "to_date('Aug 27 2001 02:00:00','Mon DD YYYY HH24:MI:SS')";
28) How does Oracle guarantee data integrity of data changes?
It enables you to define and enforce data integrity constraints like PRIMARY KEY CONSTRAINTS, FOREIGN KEY CONSTRAINTS and UNIQUE CONSTRAINTS.
29) Which environment variables are absolutely critical in order to run the OUI?
ORACLE_BASE, ORACLE_HOME, ORACLE_SID,path and library path
30) What SQL query from v$session can you run to show how many sessions are logged in as a particular user account?
select count(1) from v$session where USERNAME='username';
31) TABLESPACE is not specified for a user?
32) User SCOTT creates an index with this statement: CREATE INDEX emp_indx on employee (empno). In which tablespace would be the index created?
a. SYSTEM tablespace
b. SCOTTS default tablespace
c. Tablespace with rollback segments
d. Same tablespace as the EMPLOYEE table.
33) Which data dictionary view shows the available free space in a certain tablespace?
34) Which method increase the size of a tablespace?
A. Add a datafile to a tablespace.
B. Use the ALTER TABLESPACE command to increase the MINEXTENTS for the tablespace.
C. Use the ALTER TABLESPACE command to increase the MAXEXTENTS for the tablespace.
D. Use the ALTER TABLESPACE command to increase the MINIMUM EXTENT for the tablespace.
35) What does the command ALTER DATABASE . . . RENAME DATAFILE do?
A. It copies a data file.
B. It updates the control file.
C. It copies a data file and updates the control file.
D. It copies a data file, deletes the obsolete file, and updates the control file.
36) Can you drop objects from a read-only tablespace?
C. Only when using the DBA role
D. Only when the tablespace is online
37) SYSTEM TABLESPACE can be made off-line.
38) Datadictionary can span across multiple Tablespaces.
39) Multiple Tablespaces can share a single datafile.
40) All datafiles related to a Tablespace are removed when the Tablespace is dropped?
41) In which situation would you need to create a new control file for an existing database?
A. When all redo-log files are lost.
B. When MAXLOGMEMBERS needs to be changed.
C. When RECOVERY_PARALLELISM needs to be changed.
D. When the name of the parameter file needs to be changed
42) When configuring a database for ARCHIVELOG mode, you use an initialisation parameter to specify which action?
A. The size of archived log files.
B. How frequently log files will be archived.
C. That the database is in ARCHIVELOG mode.
d. To Store Archive log Files
43) Which command creates a text backup of the control file?
A. ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
B. ALTER DATABASE BACKUP CONTROLFILE TO BACKUP;
C. ALTER DATABASE BACKUP CONTROLFILE TO filename;
D. ALTER DATABASE BACKUP CONTROLFILE TO TEXT filename;
44) You are configuring a database for ARCHIVELOG mode. Which initialization parameter should you use?
45) How does a DBA specify multiple control files?
A. With the ADD CONTROLFILE command.
B. By using the files in the STARTUP command.
C. With the MULTIPLEX control file command.
D. By listing the files in the CONTROL_FILES parameter.
46) Which dynamic view should a DBA query to obtain information about the different sections of the control file?
47) Which statements about online redo log members in a group are true?
A. All files in all groups are the same size.
B. All members in a group are the same size.
C. The rollback segment size determines the member size.
D. Differently size of transactions requires that the DBA should differently sized members.