Here is what RDMBS is , do you call any SQL quries while backup, are they 
working independently, check your scripts and procedures for oracle 
backups, explore rman, you may need help from a dBA, to sort out the 
process.
Short for relational database management system and pronounced as separate 
letters, a type of database management system (DBMS) that stores data in 
the form of related tables. Relational databases are powerful because they 
require few assumptions about how data is related or how it will be 
extracted from the database. As a result, the same database can be viewed 
in many different ways. 
An important feature of relational systems is that a single database can 
be spread across several tables. This differs from flat-file databases, in 
which each database is self-contained in a single table. 

Almost all full-scale database systems are RDBMS's. Small database 
systems, however, use other designs that provide less flexibility in 
posing queries. 

 

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