I have been working in Oracle Database Administration since almost 8 years. I have mostly worked on Dev-Test Platforms where we maintain zero downtime. I do not have any hands on RAC or much knowledge . I have worked on 10g,19c and and pluggable database .
I know the concepts and methods of implementing Data guard (standby), I have worked on RMAN(duplication,incremental backup,complete/incomplete recovery and etc),expdp/impdp and exp/imp, little amount of scripting (SQL/Shell), basic Server management(mostly have exp on Linux), Installation of RDBMS/ASM, Creation of Databases(manually/DBCA), Security(privs,roles,auditing), Tablespace and other logical structure management, HOT backup,Cold backup(and restoration from it), Database upgradation,patching(PSU, one-off,inventory attach/detach), Tracing, SQL Loader, standby monitoring and creation, Database Monitoring and maintenance, segment management and defragmentation, Database object maintenance, Configuration of OEM etc, handling different types of Oracle errors including critical errors like 600,7445 etc... Reading and extracting AWR/ASH..
and oracle apex devopler since almost 8 years.