Oracle DBA | Tasks Of An Oracle Database Administrator (DBA) | dba1-02
Oracle DBA | Tasks Of An Oracle Database Administrator (DBA) | dba1-02
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Dear viewer, In this tutorial you will know about tasks of Database Administrator (DBA)
Task 1: Evaluate the Database Server Hardware:
Evaluate how Oracle Database and its applications can best use the available computer resources. This evaluation should reveal the following information:-How many disk drives are available to the Oracle products-How many, if any, dedicated tape drives are available to Oracle products-How much memory is available to the instances of Oracle Database you will run (see your system configuration documentation)
Task 2: Install the Oracle Database Software:
As the database administrator, you install the Oracle Database server software and any front-end tools and database applications that access the database. In some distributed processing installations, the database is controlled by a central computer (database server) and the database tools and applications are executed on remote computers (clients). In this case, you must also install the Oracle Net components necessary to connect the remote systems to the computer that executes Oracle Database.
Task 3: Plan the Database:
As the database administrator, you must plan: -The logical storage structure of the database -The overall database design -A backup strategy for the databaseConsider how the logical storage structure of the database will affect: -The performance of the computer running Oracle Database -The performance of the database during data access operations -The efficiency of backup and recovery procedures for the database
Task 4: Creating, migrating, and opening the database:
After you complete the database design, you can create the database and open it for normal use. You can create a database at installation time, using the Database Configuration Assistant (DBCA), or you can supply your own scripts for creating a database.
Task 5: Backup the Database :
After you create the database structure, perform the backup strategy you planned for the database. Create any additional redo log files, take the first full database backup (online or offline), and schedule future database backups at regular intervals.
Backup Strategy May Include:
Entire database (whole)
Portion of the database (partial)
Whole database backup: Includes all data files and at least one control file (Remember that all control files in a database are identical.)
Partial database backup:
May include zero or more tablespaces and zero or more data files; may or may not include a control file.
Backup Types (RMAN)
All data blocks within your chosen files (full)
Incremental
Cumulative
Differential
Backup Mode May Be:
Offline (consistent, cold)
Online (inconsistent, hot)
Offline backups (also known as “cold” or consistent backup):
Are taken while the database is not open. They are consistent because, at the time of the backup, the system change number (SCN) in data file headers matches the SCN in the control files.
Online backups (also known as “hot” or inconsistent backup):
Are taken while the database is open. They are inconsistent because, with the database open, there is no guarantee that the data files are synchronized with the control files.
Task 6: Enroll System Users
Task 7: Implement the Database Design
Task 8: Recovering from database failure
Task 9: Monitoring Database Performance
Task 10: Download and Install Patches
Task 11: Roll Out to Additional Hosts
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