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Oracle database

Oracle DBA Interview Questions Answered: Technical

View Also: Oracle DBA Interview Questions Answered: UNIX 60 Oracle Database Administration (DBA) Interview Questions (Technical) 1. What is an Oracle Instance? An Oracle database server consists of an Oracle database and an Oracle instance. Every time a database is started, a system global area (SGA) is allocated and Oracle background processes are started. The combination of […]

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Copy SQL Profiles to another Oracle database

Copying SQL Profiles from one database to another involves the following steps: Creating a staging table to store the SQL Profiles Packing the SQL Profiles to the staging table Export the table using Datapump or Export/Import Importing the SQL Profiles to the target database Unpack the SQL Profiles in the target database  1. Creating a staging […]

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Physical Logical Oracle Database Limits

Physical Oracle Database Limits Item Type of Limit Limit Value Database Block Size Minimum 2048 bytes; must be a multiple of operating system physical block size Maximum Operating system dependent; never more than 32 KB Database Blocks Minimum in initial extent of a segment. 2 blocks Maximum per datafile Platform dependent; typically 222-1 blocks Controlfiles Number of control files 1 minimum; 2 or more […]

Oracle database startup shutdown script

Automate Oracle Database startup shutdown script orarun – script automates database start, stop, status query tasks, also allows user to manage isqlplus console and em database control Usage: orarun {start|stop|status|isqlstart|isqlstop|emstart|emstop} orarun start|stop|status  – starts/stops database, query for database status orarun isqlstart/isqlstop – starts/stops isqlplus console orarun emstart/emstop  – starts/stops enterprise manager database control Requirements: configured […]

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Data Files: moving renaming deleting

Let’s have a look at what do we have after default database installation: SQL> SELECT name FROM v$datafile; NAME ——————————————————— /u01/app/oracle/product/10.2.0/oradata/DBSID/SYSTEM01.DBF /u01/app/oracle/product/10.2.0/oradata/DBSID/UNDOTBS01.DBF /u01/app/oracle/product/10.2.0/oradata/DBSID/SYSAUX01.DBF /u01/app/oracle/product/10.2.0/oradata/DBSID/USERS01.DBF /u01/app/oracle/product/10.2.0/oradata/DBSID/EXAMPLE01.DBF   Shutdown the database first: SQL> SHUTDOWN IMMEDIATE;   Rename a datafile:

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