Oracle Archives - Page 28 of 30

Parameters which require DB bounce.

In v$parameter we can find one column ie. ISSYS_MODIFIABLE. This column contains three phases: 1) Immediate 2) Deferred 3) False 1. Immediate : We can change the parameter in fly…

asrblogger March 7, 2022No Comments

Oracle

Creating pluggable database from another pdb, when pdb$seed in in mount state

SQL> create pluggable database PDB1 from DEV1 create_file_dest='+DEV_DG_FLASH'; Pluggable database created. SQL> show pdbs CON_ID CON_NAME OPEN MODE RESTRICTED ---------- ------------------------------ ---------- ---------- 2 PDB$SEED MOUNTED 3 PDB1 MOUNTED 4…

asrblogger February 28, 2022No Comments

Oracle

Datafiles in Oracle (Physical Storage)

Overview of Data Files At the operating system level, Oracle Database stores database data in structures called data files. Every Oracle database must have at least one data file. Use…

asrblogger February 18, 2022No Comments

Oracle

Oracle Database 19c – Practical & Assignments

PARAMETER & PASSWORDFILE: * Create pfile from spfile to location '/home/oracle/init<sid.ora>' * Create password file with sys password as oracle1 * Create parameterfile in different location /u01 & start the…

asrblogger February 13, 2022No Comments

Oracle

System Change Numbers (SCNs)

A system change number (SCN) is a logical, internal time stamp used by Oracle Database. SCNs order events that occur within the database, which is necessary to satisfy the ACID…

asrblogger January 17, 2022No Comments

Oracle

Password File management in 12C/19C

Below are the list of additional privileged user in 12c apart from the privileged user SYSOPER, SYSDBA, SYSASM. SYSBACKUP : It will be used to perform all backup and recovery related operations either…

asrblogger December 30, 2021No Comments

Oracle Scripts

Determining the Size of Oracle database tables and indexes

Useful views to get index details: dba_indexes dba_segments dba_ind_columns dba_ind_partitions user_indexes user_segments user_ind_columns user_ind_partitions Query to check Index on a Table in Oracle. set lines 200 col index_name from a30…

asrblogger December 23, 2021No Comments

Oracle

Oracle Instance and Database Shutdown Sequence

In a typical use case, you manually shut down the database, making it unavailable for users while you perform maintenance or other administrative tasks. You can use the SQL*Plus SHUTDOWN…

asrblogger December 12, 2021No Comments

Oracle RAC

ASH (Active Session History) Report in Oracle

Oracle ASH report introduced in Oracle 10g release 2. ASH collects samples of active sessions every second (waiting for non-idle events, or on the CPU working) from v$sessions (inactive sessions…

asrblogger November 26, 2021No Comments

Interview Questions Oracle

Database Buffer Cache : SGA Component of Oracle

The database buffer cache, also called the buffer cache, is the memory area that stores copies of data blocks read from data files. A buffer is a main memory address in which the buffer…