Drop Down MenusCSS Drop Down MenuPure CSS Dropdown Menu

Oracle DBA Interview Questions and Answers - Datapump

-
1) What is the use of root.sh & oraInstRoot.sh?
Ans:
Changes ownership & permissions of oraInventory
Creating oratab file in the /etc directory
In RAC, starts the clusterware stack


2) How can you transport tablespaces across platforms with different endian formats?
Ans:
RMAN

3) What is transportable tablespace (and across platforms)?

4)  What is xtss (cross platform transportable tablespace)?

5)  What is the difference between restore point & guaranteed restore point?

6) How to find if your Oracle database is 32 bit or 64 bit?
Ans:
execute the command "file $ORACLE_HOME/bin/oracle", you should see output like /u01/db/bin/oracle: ELF 64-bit MSB executable SPARCV9 Version 1

means you are on 64 bit oracle.

If your oracle is 32 bit you should see output like below
oracle: ELF 32-bit MSB executable SPARC Version 1


7) How to find opatch Version ?
Ans:
opatch is utility to apply database patch, In order to find opatch version execute"$ORACLE_HOME/OPatch/opatch version"


8) suppose i created one table after few days i did some insert,update how can i know when will i did ddl or dml operation is undergone on that table ?

ANS:

DDL:

select OWNER,OBJECT_NAME,CREATED,LAST_DDL_TIME,from dba_objects where OBJECT_NAME='&object_name';


DML:

SQL> select max(ora_rowscn), scn_to_timestamp(max(ora_rowscn)) from PS_PAY_TAX;

MAX(ORA_ROWSCN) SCN_TO_TIMESTAMP(MAX(ORA_ROWSCN))
--------------- ---------------------------------------------------------------------------
     6016929147 04-JAN-12 08.41.20.000000000 AM

SQL>

SQL> select table_name, inserts, updates, deletes, timestamp,truncated  from user_tab_modifications where table_name='TEST1';

TABLE_NAME  INSERTS    UPDATE  DELETES   TIMESTAMP         TRU DROP_SEG

---------   --------  ------- -------- ------------------- --- --------

TEST1        4         0        0     04.08.2008 12:03:32  NO   0

Comments

Post a Comment

Popular posts from this blog

postgreSQL Compress format backup

-
The -F option on pg_dump allows you to specify the format of the output. The default output is plain-text. That’s what you get when you do this: pg_dump bacula > bacula.sql and is functionally equivalent to doing: pg_dump -Fp bacula > bacula.sql There are other formats (directory, tar), but today I’m concerned with the custom (c) option. By default, this output is also compressed (see the -Z option). What is of most value is the ability to use  pg_restore  with the custom output. What’s the big deal about custom format? The more interesting option on pg_restore was -j. This allows you to run multiple concurrent jobs for the loading of data and building of indexes. This can greatly reduce the amount of time needed to restore a large database if your server has multiple processors. pg_restore can be much more useful than just doing: psql bacula < bacula.sql With pg_restore you can be very selective about what you restore. See the -L and -l options. How much do
Read more

How to find the server is whether standby (slave) or primary(master) in Postgresql replication ?

-
Method 1 You can check the mode of the server using "pg_controldata". [pgsql@test~]$ pg_controldata /usr/local/pgsql/data84/ Database cluster state: in archive recovery --> This is Standby Database Database cluster state: in production --> This is Production Database [Master] Method 2 You can use pg_is_in_recovery() which returns True if recovery is still in progress(so the server is running in standby mode or slave) postgres=# select pg_is_in_recovery(); pg_is_in_recovery ------------------- t (1 row) If Return    false   so the server is running in primary mode or master postgres=# select pg_is_in_recovery(); pg_is_in_recovery ------------------- f (1 row)
Read more

Top 10 Highest Paying URL Shortener Companies - Best URL Shorteners To Earn Fast

-
Image
These are the lists of top paying url shortening websites that are similar to Adfoc.us or Shrink url Websites like Adfoc.us. The websites are similar in the sense that you can use the same pattern of registration and earnings for all them, but the only difference is the amount of money each pays to its members and also the percentage of earnings from their referral programs. 1. ADF.LY – Free Url Shortening similar to adfocus that will pay you $4 for 1000 clicks on your shorten url. You can Also refer your friends and earn 20% of their earnings for life. Their payment is quick and consistant. Paypal Or Alertpay. It’s legit and very popular. JOIN  HERE Payment Options Details :- Payout for 1000 Views: Upto $9 Minimum Payout: $5 Referral Commission: 20% Payment Options:Payoneer, Payza Payment Time : Daily and On Request You can Withdraw money Following Accounts:- 2. LINKBUCKS – free url shortening LINKBUCKS is a free url shortening service website si
Read more

7 Steps to configure BDR replication in postgresql

-
Image
 The  BDR  (Bi-Directional Replication) project adds multi-master replication to PostgreSQL 9.4.  Postgres-BDR has a lower impact on the masters(s) than trigger-based replication solutions. There is no write-amplification, as it does not require triggers to write to queue tables in order to replicate writes.   Here We are using  postgres version 9.4.12 and bdr version 1.0.2. for configuring  multi master replication . Simply Following 7 steps you can configure the multi master replication in postgresql. To download the bdr in below link. .   https://github.com/2ndQuadrant/bdr/archive/bdr-pg/REL9_4_12-1.tar.gz $ tar -xzvf REL9_4_12-1.tar.gz $ wget https://github.com/2ndQuadrant/bdr/archive/bdr-plugin/1.0.2.tar.gz $ tar -xzvf 1.0.2.tar.gz 1. To install BDR. $ cd ~/bdr-bdr-pg-REL9_4_12-1 $ ./configure --prefix=/usr/lib/postgresql/9.4 --enable-debug --with-openssl $ make -j4 -s install-world $ cd ~/bdr-bdr-plugin-1.0.2 $ PATH=/usr/lib/postgresql/9.4/bin:"$PATH" ./c
Read more

Postgres Streaming Replication Configuration

-
Primary - Existing Test Server: ======= Hostname: nijam-1 IP Address: 53.99.198.11 Secodary - New Test Server ======== Hostname: nijam-2 IP Address: 53.99.198.12 ===================================================== Step 1. stop the slave server /optt/10.5/bin/pg_ctl -D /DATA stop Step 2. move the slave data directory to backup location: mv /DATA/* /tmp/backup Step 3. change below parameter on master postgresql.conf & pg_hba.conf files . listen_addresses = 'localhost,53.99.198.11' wal_level = replica # minimal, replica, or logical archive_mode = on archive_command = 'cp %p /ARCHIVES/%f' max_wal_senders = 10 wal_keep_segments = 25 On pg_hba.conf: host replication postgres 53.99.198.12/24 trust host replication postgres 53.99.198.11/24 trust Step 4. Restart the master server: /optt/10.5/bin/pg_ctl -D /DATA restart Step 5. taking consistancy backup: psql -c "sele
Read more