Sergey Stadnik

Melbourne Area, Australia Australia

Highly skilled Oracle Developer / DBA, financial industry background

Technology / Software / Internet

I am an Oracle developer with deep understanding of how Oracle database works. I know how to write SQL and PL/SQL code for optimised maximum performance. I specialise on Business Intelligence, Data Analysis and Data Warehouse areas, data migrations and ETL/ELT, where maximum database performance is paramount. My colleagues regard me as a master in black art of SQL performance tuning. I am often asked to look at SQL queries which take hours to complete. For example, I was asked to look at a data transformation procedure which was running for over 5 hours, which was unacceptable due to limited run window. By changing just 1 line of an SQL query I was able to bring down the run time to 15 ...