Where is my PL/SQL? – restore and recovery of PL/SQL code

Sometime it can happen to loose PL/SQL code from the database. What’s the reason behind is not important. The only important thing is to recover it as soon as possible. Fortunately Oracle is storing the PL/SQL code in tables, that makes the recovery quite easy. For this I’m using two techniques, which I’m gonna cover […]

I’m speaking at SrOUG and beIT

Next month I’m honored to speak at two great conferences – SrOUG and beIT.         See you there! Kovachev

Optimizer statistics – Gathering Statistics and Histograms

It’s such a mess with those histograms and statistics that I had to rewrite this post at least ten times. It’s such a mess that I still cannot believe how poorly maintained the global statistics are and how badly created the histograms are. Because of this mess and the depth of the topic this post […]

I’m speaking at OUG Ireland

Next March 19th I’ll be speaking at OUG Ireland in Dublin, presenting some cool stuff around Oracle Database 12c, PDB Cloning, ZFS snapshots and Change management through EM12c. The topic is easy going and can be interesting for DBA’s and developers as well. The abstract and agenda of OUG Ireland is in here http://bit.ly/1vg3Lie . […]

Optimizer statistics – Stale percentage and partitioning

Oracle is full of surprises, dbms_stats and optimizer statistics as well. That’s why I’m starting a new series named “Optimized statistics” in which I’ll cover some gathering and usage issues related to them. As we know 11g have a cool feature which tracks how much data we had changed in our objects and if it’s […]

RAC, 12c and Direct Path Reads

Yes, direct path reads again :) No worries I’m already a bit bored from digging in this algorithm, so I think this is going to be my last post about it. Till they change it again of course. And yes, in 12.1.0.2 they did. For introduction to DPR, you can check my previous post, because […]

I’m speaking at…

HROUG,SIOUG and BGOUG. At HROUG and SIOUG I’ll be speaking for Exadata and at BGOUG, maybe for near zero downtime migration or some similar geeky topic ;) Links to the events:         Have fun! Kovachev

12c HCC Row-Level Locking

In Oracle Database 12c we can find many new and shiny things… So many that we can miss the little good things really easy. I think that this one, is one of them. Previously I made a post “All About HCC“, describing how HCC is working and some of the issues that we can hit […]

B-tree and nulls

Today while I was scrolling my “WordPress reader” page I saw a post which reminds me to something I had fun before /and find it useful in many situations/: So if we have an index based on null column followed by not null column we can use it to filter the rows with null value. […]