Hi, I wanted to create a post series about cloning/duplicating database on the same or remote servers. There are so many options and combinations about this like rman duplicate database with/without target/source db connection, rman restore using backups, ASM to OS or OS to ASM, same server or remote server, OMF or regular file naming
Administration
Pragma UDF & Deterministic
Hello everyone, I wanted to write about something simple and can improve the performance of your sql statements. Unfortunately, many database developers use too much plsql function in their SQL statements. I say too much because if you learn more about the SQL, you will use less plsql. SQL is very capable language to process
PLSQL and Flashback Data Archive Problems.
Hi, I have written about flashback data archive before. if you didn’t read please check these post first. http://mustafakalayci.me/2019/03/02/goodbye-log-triggers-welcome-flashback-data-archive/ http://mustafakalayci.me/2020/09/10/flashback-data-archive-problems/ I’ve already mentioned about some problems on my second post but these are not kind of problems which will stop your work. The problem I am about talk is that kind of problem. From my
ORA-24244: invalid host or port for access control list (ACL) assignment
Hello everyone, So you wanted to migrate your ACLs to another database or you are trying to add a new acl entity but you got ORA-24244. There are many reasons for that error unfortunately. I wish Oracle provides us more detail about what is the error but I wanted to share what I have seen
export import ACL & ORA-24244 error during import
Hello everyone, it’s been a while since my last post. So, I wanted to write about export and import ACL privileges. They always become a pain (at least for me). after 12c, Oracle introduce us a new and easy way of ACL copying from db to db. export&import. so here is the basic command on
Which Column has Changed in Every Row?
Hi, Edit: Thanks to Chris Saxon who is from asktom team, checked my code and warned me about a problem. Not to overload the PGA fetch_rows function only fetches 1024 rows at once so every row set chunk size is 1024. In this case for the 1025th row, previous row information is lost because fetch_rows
Direct Path Insert &/vs Conventional Insert
Hi there, I couldn’t write anything for a while. Those days were busy. So I would talk to about direct path insert and conventional insert. Many people think that they are using “direct path insert” when used sqlldr utility but they are not. it is easy to confused batch insert and direct path insert. of
Flashback Data Archive Problems!
Hi, if you don’t know about flashback data archive you can check this post first: http://mustafakalayci.me/2019/03/02/goodbye-log-triggers-welcome-flashback-data-archive/ I mentioned about flashback data archive (FDA) in that post and really flattered it. Well, maybe I shouldn’t! FDA is really fast dml tracking method but thanks to Peter Schlaeger, I noticed some potential problems and “some” solutions. Few
Oracle Table Compression Part1
Hi, I have been dealing with table compression a lot during my development period and I still do. I wanted to share some information about table information but I believe this will be a long explanation so I will write them in parts and this is part1. Table compression is a very useful feature of
Redo Log Switch Order
Hi, I always have the impression that redo log switch occurs in group number order but a small test showed me, I was wrong. As you know redo log is one of the most important part of a Oracle database. it almost protect everything! your data in memory, data file, your transaction etc. whenever you