I did a database replication and users are complaining the database is very slow.Before i did the exercise there were no complaints.I haven't changed anything from the database. How can i increase speed or the performance of the database.Can someone help me. Am new in oracle database.
Too little information to collaborate. Since you said you're new to Oracle, I suppose you are not the person who set up the replication, therefore I suggest you seek for that person and have him explain what he did to you.
Sorry, this seems like a no-no answer but there's so much to talk about your problem that I do not know where to even start.