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