hi I am some question, i want some opinion below question We planning ERP solution convert oracle to mariaDB so erp application pattern and BIG DB SIZING IS ISSUE. Our IT background & goal 1) Apppliciation Complexity & Pattern: ERP Level complexity (high , OLTP & many batch) 2) DB SIZE : 10 TB Over (Single DB , NO sharding) 3) replication Gap issue ** My Question ** 1) Any Global reference is in MariaDB (on ERP level complexity and application pattern) 2) Any some reference in BIG DATA SIZING ? (EX: 5TB DB Exists in XX COMPARY e-commerce soluntion..) IS Only solution is DB Sharding? no big data global reference ?? 3) Replication performance : Our test result 2MB/SEC binlog written in master , so slave node get replication lag glorwing. (in row binlog format) ( 1master - 1 slave ) Any Body have experience some reference max transaction in no replication gap ? ( ex : 20MB / SEC but no replication gap our application experience..) : parellel slave thread is good performance in single domain-id and ordered method replicaiton ? ( how much better performance in parallel replication? (ex single repliation 2MB/SEC BINLOG => Replication GAP GROW but, parellel replicaiton is good in 10MB/Sec binlog write Environment) thanks a lot. regards, seung hoon yoo.