Hotsos Symposium Speaker – Andrey Nikolaev

Andrey Nikolaev is a returning Hotsos Symposium presenter.


Andrey NikolaevAndrey Nikolaev was first met with Oracle 5 in 1988. Since that time his professional interests have evolved from high performance particle physics computing, through application development, to database performance consulting, but always stay centered on performance. Working in RDTEX, Russian First Line Support company, he devotes his time to tuning and diagnosing the largest Oracle databases in Russia. As an Oracle University trainer, Andrey taught the full spectrum of Oracle database administration courses.

Presentation Title

Mutex Internals


KGX mutexes is new type of spinlocks used in the latest Oracle versions. Despite being known since 2005, mutex is still Terra incognita. The mutex contention is frequently observed in high concurrency OLTP environments.

Using oradebug and DTrace, this presentation explores how mutex operates, spins, and sleeps. It will show how Oracle instruments the mutex operations; discuss parameters and statistics related to mutex performance diagnostics and tuning.

Presentation Materials

Presentation materials are available online to attendees only.


The speaker schedule is as follows:

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