Refer the link nice blog

http://dbaocm.blogspot.com/p/oem-13c.html -- oem13 ***

http://db.geeksinsight.com/18c-database/

https://richardfoote.wordpress.com/2014/11/  --- index


https://anandoracledba.blogspot.com/search/label/RAC   --RAC

http://oracleinaction.com/add-node/ --RAC


http://netsoftmate.blogspot.com/search/label/ASM%20disk%20Group -- ASM


http://select-star-from.blogspot.com/search/label/RAC --  INTERVIEW


https://samadhandba.wordpress.com/category/performance-tunning/   - PERFORMANCE


http://facedba.blogspot.com/2017/06/applying-psu-apr-2017-patch-on
-oracle.html -- PATCH


https://www.oraclenext.com/2016/04/installing-oracle-12c-database-software.html  --INSTALLATION



http://www.br8dba.com/category/rac/   -- RAC DBA


https://juliandontcheff.wordpress.com/category/cloud/   -- ORACLE CLOUD

https://mandysandhu.com/ -- CLOUD


http://www.ashdba.com/upgrade-oracle-grid-infrastructure-from-12-1-0-1-to-12-1-0-2/ -- UPGRADE


http://oracledbwr.com/  -- DBA   *******

https://oracledbwr.com/oracle-video-tutorial-with-demo-performance-tuninggoldengateracdataguard/


http://o-dba.blogspot.com/search/label/RAC -- DBA RAC -LATEST ********



http://dbakeeda.blogspot.com/  -- PERFORMANCE


http://expertoracle.com/category/tuning/ --- TUNINNG *********


https://www.ktexperts.com/category/aws/ ---AWS

http://db.geeksinsight.com/amazon-rds/   -- AWS


http://raghavt.blogspot.com/2011/04/postgresql-90-architecture.html?m=1  --POSTGRES


https://channel9.msdn.com/Series/SQL-Server-2014-Essentials-for-Oracle-DBAs/10 -- SQLSERVER


http://dbamanojsimar.blogspot.com/search/label/Performance%20Tuning  -- interview questions

Oracle blogs to refer

https://anuragkumarjoy.blogspot.com/2018/01/step-by-step-procedure-for-applying-psu_30.html

1) http://www.dbacentre.com/oracle-dba-tutorials/

2) http://select-star-from.blogspot.in/2013/07/oracle-dba-interview-questions-answers_2192.html

3)https://sujeetdba.blogspot.in/2015/01/oracle-database-upgrade-11203-to-1210.html

4)http://www.hhutzler.de/blog/crs-doesnt-start-due-to-crs-1714-error/   ----ASM

5)https://databaseinternalmechanism.com/2016/09/22/datapump-export-everything-need-to-know/

6)http://www.runningoracle.com/product_info.php?cPath=84&products_id=226  --scripts


7) http://dbakeeda.blogspot.com/search/label/Performance%20Tuning?updated-max=2017-10-09T13:55:00-07:00&max-results=20&start=6&by-date=false

8) https://oracledbwr.com/oracle-12c-multitenant-database-backup-using-rman/

9) http://facedba.blogspot.com/2017/06/applying-psu-apr-2017-patch-on-oracle.html