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. […]

Solaris 11 – Zones for Oracle Database and RAC

As simple as that! ZONE CONFIGURATION Steps: 1.Create the zone configuration; 2.Specify datasets and devices; 3.Configure network; 4.Configure resources and limits; 5.Verify and commit; 1.Create the zone configuration: Zone configuration is created and maintained through zonecfg utility. To create a new zone we shall use the following syntax: This will open an interactive interface for […]

Solaris 11 – IPS Local Repository

A fast and straight approach for creating local IPS repository. CREATING THE REPOSITORY The steps are basic: 1.Download the repository; 2.Concatenate the iso files; 3.Mount the iso; 4.Create the zfs dataset; 5.Create the repository; 6.Copy the repository; 7.Build the search index; 8.Set the repository; 9.Unmount the iso; Code example: Note – pkg set-publisher: -G ‘*’ […]

I’m Speaking at BGOUG

See you there folks!

Direct Path Reads and Cell Offloading

Most people are relating direct path reads with an algorithm which is just controlling the way our read is performed. But actually in Exadata environment this is the algorithm which is balancing the load between the Compute and the Storage nodes. Something really important. As usual, the algorithm is not perfect and for some situations […]

ALL about HCC

If you try to find out what is HCC and how it works you could start reading the documentation, then some books, blog posts and at the end you will have to put all together. In this post I’ll do exactly this. Put all together. Starting with the basic and going through the internals with […]