Christo Kutrovsky

An Oracle ACE with a deep understanding of databases, application memory, and input/output interactions, Christo is an expert at optimizing the performance of the most complex infrastructures. Methodical and efficiency-oriented, he equates the role of an ATCG Principal Consultant in many ways to that of a data analyst: both require a rigorous sifting-through of information to identify solutions to often large and complex problems. A dynamic speaker, Christo has delivered presentations at the IOUG, the UKOUG, the Rocky Mountain Oracle Users Group, Oracle Open World, and other industry conferences.

Oracle

Oracle parallel query hints reference - part 6: USE_PARTITION_WISE_GBY

Welcome to part 6 of the series. The USE_PARTITION_WISE_GBY hint is "brand new," introduced in 12.2. I personally ...

Oracle

What's in your Exadata Smart Flash Cache?

One of the exclusive Exadata features is the Smart Flash Cache ( Oracle White Paper PDF). On a full rack, there is 5 TB ...

Oracle

Oracle parallel query hints - part 1: PQ_DISTRIBUTE

One of the most powerful features of the Oracle database is its ability to leverage multiple CPU cores across many RAC ...

Oracle

Oracle parallel query hints - part 3: PX_JOIN_FILTER

In part one of this series on Oracle Parallel Query Hints, I looked at PQ_DISTRIBUTE, and part two was about ...

Oracle

Pythian goodies: the answer to free memory, swap, oracle, and everything

I gave this talk at the UKOUG, and I have received a few requests to post the slides online. Instead of just posting ...

Oracle

Oracle parallel query hints reference - part 5: PQ_DISTRIBUTE_WINDOW

Welcome to part 5 of the series.

Oracle

Oracle parallel query hints. A reference series part 2: PQ_REPLICATE

The Mechanics of PQ_REPLICATE in Oracle 12.2 In part 1 of this series, we talked about the basic mechanics of the ...

Oracle

Oracle's CREATE INDEX command can take a hint

While experimenting with Auto DOP (parallel_degree_policy) in Oracle 12c, I stumbled upon a highly effective (and ...

Oracle

Oracle's OPT_ESTIMATE hint: Usage Guide

It's one of those hints that you've heard about many times, but all the information is scattered, and finding what you ...

Oracle

Oracle parallel query hints reference - part 7: PQ_DISTRIBUTE and partitioned tables

In Part 1 of the series, we covered in detail how the PQ_DISTRIBUTE can change the data distribution method across ...

Oracle

Oracle 10g R2 RAC - vip on wrong interface

Problem Statement I was installing RAC, and during the clusterware install I picked up the wrong interfaces for public ...

Oracle

Locating most current record using ROW_NUMBER() vs. Index Full Scan (Min/Max)

Very often when reading data, we need to locate the most current record for a set of conditions. One typical example is ...

Oracle

Exadata Join Offloading in Action

One of the biggest selling features of Oracle's flagship engineered system - Exadata - is the storage offloading ...

Oracle

How to Make an In-Database listener.log File

Introduction Ever wished the listener.log file was a table in the database? Wish no more! About three years ago, I sent ...

Oracle

Sequences in Oracle 10g RAC

Just recently I got a call from a developer. He had a table with a primary key populated by a sequence, a timestamp ...

Oracle

Oracle RAC Cache Fusion Efficiency: A Buffer Cache Analysis

My apologies — there will be no broccoli in this post. Introduction Many people would like to know how well their ...

Oracle

Bind Peeking, Ad Hoc Queries, Stable Performance

I got to troubleshoot an amazing situation a few weeks ago. I think, we can all agree that assuming we are on a ...

Oracle

Adding Columns with Default Values and Not Null in Oracle 11g

Oracle 11g has a new performance enhancement when adding columns. In the pre-11g releases, adding a new not null column ...

Oracle

ASM multi-disk performance

This is a fascinating look into storage architecture! It perfectly illustrates that "more hardware" doesn't always ...

Oracle

Oracle: How to move a table to another schema?

Backstory A client asked me, “How can I move a table to another schema in Oracle?” The quick answer I gave him is, “not ...

Oracle

Aligning ASM Disks on Linux

Linux is a wonderful operating system. However there are a number of things that one needs to do to make sure it runs ...

Oracle

Designing for Exadata: Maximizing Storage Indexes Use

Oracle Exadata V2 is a very well balanced database machine combined with smart and innovative software. One of these ...

Oracle

How to Recover Deleted Oracle Datafiles with No Downtime

So you have accidentally removed a datafile from your production database? First thing, DON’T PANIC! There’s an easy ...

Oracle

Recent Spike Report from v$active_session_history (ASH)

Background For the past few months I’ve been using a query that I refer to as “ash report – recent spike”. That’s the ...

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Christo Kutrovsky

Posts by Christo Kutrovsky

Oracle parallel query hints reference - part 6: USE_PARTITION_WISE_GBY

What's in your Exadata Smart Flash Cache?

Oracle parallel query hints - part 1: PQ_DISTRIBUTE

Oracle parallel query hints - part 3: PX_JOIN_FILTER

Pythian goodies: the answer to free memory, swap, oracle, and everything

Oracle parallel query hints reference - part 5: PQ_DISTRIBUTE_WINDOW

Oracle parallel query hints. A reference series part 2: PQ_REPLICATE

Oracle's CREATE INDEX command can take a hint

Oracle's OPT_ESTIMATE hint: Usage Guide

Oracle parallel query hints reference - part 7: PQ_DISTRIBUTE and partitioned tables

Oracle 10g R2 RAC - vip on wrong interface

Locating most current record using ROW_NUMBER() vs. Index Full Scan (Min/Max)

Exadata Join Offloading in Action

How to Make an In-Database listener.log File

Sequences in Oracle 10g RAC

Oracle RAC Cache Fusion Efficiency: A Buffer Cache Analysis

Bind Peeking, Ad Hoc Queries, Stable Performance

Adding Columns with Default Values and Not Null in Oracle 11g

ASM multi-disk performance

Oracle: How to move a table to another schema?

Aligning ASM Disks on Linux

Designing for Exadata: Maximizing Storage Indexes Use

How to Recover Deleted Oracle Datafiles with No Downtime

Recent Spike Report from v$active_session_history (ASH)

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