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This summary describes measurement errors identified in an I/O bottleneck problem in a 3-node RAC database environment: - Instance 1 was showing substantially higher single block read times than the other instances during off hours, when 5 batch jobs were running, indicating the timings for Instance 1 were incorrect. - The "sandwich syndrome" was observed, where gettimeofday calls showed excessive wait times between initiating and completing a single block read, exaggerated by the process waiting in the run queue for CPU. - The facts suggest the measurement errors were caused by the batch jobs causing Instance 1 to wait for CPU, inflating the perceived read latencies in the performance metrics.
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Jože Senegačnik is an Oracle ACE Director and co-author of the book "Expert Oracle Practices" who has over 25 years of experience with Oracle databases. He is the owner of Dbprof d.o.o. in Slovenia and maintains blogs on Oracle, flying, and cooking in addition to being a member of the OakTable Network and VP of the Slovenian OUG board.
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Izmantojiet iespēju piedalīties plašākajā IT nozares konferencē Baltijā Riga Dev Day 2016, kas jau otro gadu no 2. līdz 4. martam norisināsies Rīgā.
Ko iegūsiet?
Praktiski pielietojamu informāciju par IT nozares aktuālākajām un jaunākajām tēmām – mobilo ierīču aplikāciju izstrādi, Java/JVM, JavaScript jaununiem, Oracle datu bāzes risinājumiem un modernākajām tehnoloģijām.
My two cents about Mysql backup
in LATVIAN language: Viens no galvenajiem datubāzes administratora uzdevumiem ir veikt datubāzes backup un prast no tā atjaunot datubāzi. Mysql bezmaksas versija nepiedāvā datubāzes administratoram ļoti daudz izvēles. Sava prezentācija es pastāstīšu par šādiem rīkiem:
-- MySQLdump
-- Percona XtraBackup
-- Mysql enterprise backup (MEB)
--Un citiem rīkiem kas palīdz man veikt db backup
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Par grupas dalībnieku var kļūt jebkurš interesents.
Middleware upgrade to Oracle Fusion Middleware(FMW) 12c.Real Case stories.
Tēmas apraksts: Middleware atjaunināšana līdz FMW 12c. Reālu projektu pieredze. Salīdzinoši nesen tika publicēta Oracle FMW 12c produktu līnija. Šoreiz gribu padalīties ar atjaunināšanas līdz Oracle FWM 12c pieredzi. Pamatu pamati, zemūdens akmeņi un tehniskie triki, kas var palīdzēt jums ietaupīt laiku un var būt arī saglabāt nervus.
Тема (РУ): Обновление Middleware до FMW 12c. Опыт реальных проектов.Описание: Относительно недавно вышла в свет линейка продуктов Oracle FMW 12c. В этот раз я хочу поделиться своим опытом обновления до Oracle FWM 12c.
Прописные истины, подводные камни и технические хитрости, которые помогут сберечь ваше время и, возможно и нервы.
Description(ENG): Relatively recently Orcale FMW 12c product line has been published.Today I would like to share my experience of middleware upgrade to Oracle FWM 12c.
Basics, pitfalls and technical tricks, that can save your time and nerves, may be.
How to Make Awesome SlideShares: Tips & Tricks
Turbocharge your online presence with SlideShare. We provide the best tips and tricks for succeeding on SlideShare. Get ideas for what to upload, tips for designing your deck and more.
Getting Started With SlideShare
SlideShare is a global platform for sharing presentations, infographics, videos and documents. It has over 18 million pieces of professional content uploaded by experts like Eric Schmidt and Guy Kawasaki. The document provides tips for setting up an account on SlideShare, uploading content, optimizing it for searchability, and sharing it on social media to build an audience and reputation as a subject matter expert.
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Middleware upgrade to Oracle Fusion Middleware(FMW) 12c.Real Case stories.
Middleware upgrade to Oracle Fusion Middleware(FMW) 12c.Real Case stories.
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Thank you for being with LVOUG on meetup 17.
For those who was not able to attend;
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Why we are talking about this
How – minimal survival kit
Database provisioning:
Database provisioning
Pluggable database provisioning
Schema provisioning
Middleware provisioning:
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Integration provisioning
Restrictions
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Q&A
Peteris Arajs
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Alex Gorbachev & Yury Velikanov
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LVOUG news 5-OCT-2015
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In the realm of cybersecurity, offensive security practices act as a critical shield. By simulating real-world attacks in a controlled environment, these techniques expose vulnerabilities before malicious actors can exploit them. This proactive approach allows manufacturers to identify and fix weaknesses, significantly enhancing system security.
This presentation delves into the development of a system designed to mimic Galileo's Open Service signal using software-defined radio (SDR) technology. We'll begin with a foundational overview of both Global Navigation Satellite Systems (GNSS) and the intricacies of digital signal processing.
The presentation culminates in a live demonstration. We'll showcase the manipulation of Galileo's Open Service pilot signal, simulating an attack on various software and hardware systems. This practical demonstration serves to highlight the potential consequences of unaddressed vulnerabilities, emphasizing the importance of offensive security practices in safeguarding critical infrastructure.
Connector Corner: Seamlessly power UiPath Apps, GenAI with prebuilt connectors
Join us to learn how UiPath Apps can directly and easily interact with prebuilt connectors via Integration Service--including Salesforce, ServiceNow, Open GenAI, and more.
The best part is you can achieve this without building a custom workflow! Say goodbye to the hassle of using separate automations to call APIs. By seamlessly integrating within App Studio, you can now easily streamline your workflow, while gaining direct access to our Connector Catalog of popular applications.
We’ll discuss and demo the benefits of UiPath Apps and connectors including:
Creating a compelling user experience for any software, without the limitations of APIs.
Accelerating the app creation process, saving time and effort
Enjoying high-performance CRUD (create, read, update, delete) operations, for
seamless data management.
Speakers:
Russell Alfeche, Technology Leader, RPA at qBotic and UiPath MVP
Charlie Greenberg, host
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Katja Glaß
OpenStudyBuilder Community Manager - Katja Glaß Consulting
Marius Conjeaud
Principal Consultant - Neo4j
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Gursev Pirge, PhD
Senior Data Scientist - JohnSnowLabs
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Artificial Intelligence and Electronic WarfarePapadakis K.-Cyber-Information Warfare Analyst & Cyber Defense/Security Consultant-Hellenic MoD
AI & Electronic WarfarezkStudyClub - LatticeFold: A Lattice-based Folding Scheme and its Application...
Folding is a recent technique for building efficient recursive SNARKs. Several elegant folding protocols have been proposed, such as Nova, Supernova, Hypernova, Protostar, and others. However, all of them rely on an additively homomorphic commitment scheme based on discrete log, and are therefore not post-quantum secure. In this work we present LatticeFold, the first lattice-based folding protocol based on the Module SIS problem. This folding protocol naturally leads to an efficient recursive lattice-based SNARK and an efficient PCD scheme. LatticeFold supports folding low-degree relations, such as R1CS, as well as high-degree relations, such as CCS. The key challenge is to construct a secure folding protocol that works with the Ajtai commitment scheme. The difficulty, is ensuring that extracted witnesses are low norm through many rounds of folding. We present a novel technique using the sumcheck protocol to ensure that extracted witnesses are always low norm no matter how many rounds of folding are used. Our evaluation of the final proof system suggests that it is as performant as Hypernova, while providing post-quantum security.
Paper Link: https://eprint.iacr.org/2024/257
Apps Break Data
How information systems are built or acquired puts information, which is what they should be about, in a secondary place. Our language adapted accordingly, and we no longer talk about information systems but applications. Applications evolved in a way to break data into diverse fragments, tightly coupled with applications and expensive to integrate. The result is technical debt, which is re-paid by taking even bigger "loans", resulting in an ever-increasing technical debt. Software engineering and procurement practices work in sync with market forces to maintain this trend. This talk demonstrates how natural this situation is. The question is: can something be done to reverse the trend?
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Joze senegacnik rt_topics
- 2. I/O Bottleneck Problem Response Time Component Time % Elap AvgEla ---------------------------------------- ----------- ------- --------- CPU service 3934.97s 48.39% 0.000716 un-accounted for time 1363.01s 16.76% db file sequential read 1122.00s 13.80% 0.032253 gc buffer busy 451.73s 5.56% 0.011746 log buffer space 451.64s 5.55% 0.123974 buffer busy waits 176.79s 2.17% 0.029579 gc cr block 2-way 156.49s 1.92% 0.003287 gc cr grant 2-way 100.20s 1.23% 0.006541 latch: cache buffers chains 98.92s 1.22% 0.005708 gc current grant 2-way 69.68s 0.86% 0.006728 latch: library cache 30.10s 0.37% 0.010030 row cache lock 28.95s 0.36% 0.018727 gc current block 2-way 26.72s 0.33% 0.003828 gc cr block busy 19.35s 0.24% 0.006802 gc current grant busy 15.30s 0.19% 0.004999 latch: row cache objects 14.28s 0.18% 0.006165 gc cr block 3-way 11.73s 0.14% 0.002952 gc current block 3-way 11.34s 0.14% 0.003440 log file sync 10.71s 0.13% 0.315066 enq: SQ - contention 9.14s 0.11% 0.060911
- 3. Timings for Single Block Reads – 3 node RAC Single Block Read Times From AWR 0 5 10 15 20 25 30 35 40 45 50 0:00 1:40 3:20 5:00 6:40 8:20 10:00 11:40 13:20 15:00 16:40 18:20 20:00 21:40 23:20 Snapshot ID - 20 minutes interval SingleBlockReadTimein Milliseconds Inst 1
- 4. Timings for Single Block Reads – 3 node RAC Single Block Read Times From AWR 0 5 10 15 20 25 30 35 40 45 50 0:00 1:40 3:20 5:00 6:40 8:20 10:00 11:40 13:20 15:00 16:40 18:20 20:00 21:40 23:20 Snapshot ID - 20 minutes interval SingleBlockReadTimein Milliseconds Inst 1 Inst 2 Inst3
- 5. The Facts About The I/O Bottleneck Problem • Facts: – 3 node RAC – Same storage – Single block read time for Instance 1 was substantially different from read times for other instances during off hours – 5 batch jobs during off hours • The timings for Instance 1 are obviously not correct • The sandwich syndrome (output from strace) gettimeofday({1159440978, 931945}, NULL) = 0 pread(14, "6242003752302+254.000160054001050"..., 8192, 455 057408) = 8192 gettimeofday({1159440978, 944159}, NULL) = 0 • Waiting in runque for CPU exaggerates all wait times of the process.
- 7. Too many sessions • 35000 sessions per instance • database level 70000 (2-node RAC)