Search results “Oracle distributed lock timeout”
01 Oracle database Table lock
Purpose Use the LOCK TABLE statement to lock one or more tables, table partitions, or table subpartitions in a specified mode. This lock manually overrides automatic locking and permits or denies access to a table or view by other users for the duration of your operation. Some forms of locks can be placed on the same table at the same time. Other locks allow only one lock for a table. A locked table remains locked until you either commit your transaction or roll it back, either entirely or to a savepoint before you locked the table. A lock never prevents other users from querying the table. A query never places a lock on a table. Readers never block writers and writers never block readers. See Also: Oracle Database Concepts for a complete description of the interaction of lock modes COMMIT ROLLBACK SAVEPOINT Prerequisites The table or view must be in your own schema or you must have the LOCK ANY TABLE system privilege, or you must have any object privilege on the table or view. ROW SHARE ROW SHARE permits concurrent access to the locked table but prohibits users from locking the entire table for exclusive access. ROW SHARE is synonymous with SHARE UPDATE, which is included for compatibility with earlier versions of Oracle Database. ROW EXCLUSIVE ROW EXCLUSIVE is the same as ROW SHARE, but it also prohibits locking in SHARE mode. ROW EXCLUSIVE locks are automatically obtained when updating, inserting, or deleting. SHARE UPDATE See ROW SHARE. SHARE SHARE permits concurrent queries but prohibits updates to the locked table. SHARE ROW EXCLUSIVE SHARE ROW EXCLUSIVE is used to look at a whole table and to allow others to look at rows in the table but to prohibit others from locking the table in SHARE mode or from updating rows. EXCLUSIVE EXCLUSIVE permits queries on the locked table but prohibits any other activity on it. NOWAIT Specify NOWAIT if you want the database to return control to you immediately if the specified table, partition, or table subpartition is already locked by another user. In this case, the database returns a message indicating that the table, partition, or subpartition is already locked by another user. WAIT Use the WAIT clause to indicate that the LOCK TABLE statement should wait up to the specified number of seconds to acquire a DML lock. There is no limit on the value of integer. If you specify neither NOWAIT nor WAIT, then the database waits indefinitely until the table is available, locks it, and returns control to you. When the database is executing DDL statements concurrently with DML statements, a timeout or deadlock can sometimes result. The database detects such timeouts and deadlocks and returns an error.
Views: 533 OnLinE ReSoUrCe
Light Weight Transactions Under Stress  (Christopher Batey, The Last Pickle) | Cassandra Summit 2016
Slides: https://www.slideshare.net/DataStax/light-weight-transactions-under-stress-christopher-batey-the-last-pickle-cassandra-summit-2016 | The Strong Consistency provided by QUORUM reads in Cassandra can still lead to read-write-modify problems when applications want to do things such as guarantee uniqueness or sell exactly 300 cinema tickets. Fortunately Light Weight Transactions (LWT) are designed to solve the problems Strong Consistency can not. In this talk Christopher Batey, Consultant at The Last Pickle, will discuss: - Syntax and semantics: Theoretical use cases - How they work under the covers Then we will go through LWTs in practice: - How do the number of nodes/replicas/data centres affect performance? - How does contention (multiple concurrent queries using LWTs) affect availability and performance? - What consistency guarantees do you get with other LWTs and non-LWTs? - How does LWT timeout differ from normal write timeout? - Use case: LWTs as a distributed lock and how it went wrong 5 times. About the Speaker Christopher Batey Consultant / Software Engineer, The Last Pickle Christopher (@chbatey) is a part time consultant at The Last Pickle where he works with clients to help them succeed with Apache Cassandra as well as a freelance software engineer working in London. Likes: Scala, Haskell, Java, the JVM, Akka, distributed databases, XP, TDD, Pairing. Hates: Untested software, code ownership. You can checkout his blog at: http://www.batey.info
Views: 1658 DataStax
Deadlock Prevention using Timestamps - Wait Die and Wound Wait Scheme
DBMS Tutorial in Hindi, English - Deadlock Prevention using Timestamps - Wait Die and Wound Wait Scheme for students of IP University Delhi and Other Universities, Engineering, MCA, BCA, B.Sc, M.Sc Colleges.
Database Lesson #6 of 8 - Database Administration
Dr. Soper gives a lecture on database administration. Topics covered include concurrent access / concurrency control, database security, database backup and recovery strategies, database locking (including optimistic locking, pessimistic locking, and deadlock), and database transactions.
Views: 83763 Dr. Daniel Soper
Lecture - 25 Basic 2-Phase and 3-phase commit protocol
Lecture Series on Database Management System by Prof. D. Janakiram, Department of Computer Science and Engineering,IIT Madras. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 56440 nptelhrd
Analyze Your Applications and Storage Together
Break the siloed tradition of capacity management. Listen to TeamQuest Advocate Dave Wagner explain the new goals of optimizing resources and accelerating the value from all your tools and processes with capacity management.
Two-phase commit protocol
In transaction processing, databases, and computer networking, the two-phase commit protocol is a type of atomic commitment protocol. It is a distributed algorithm that coordinates all the processes that participate in a distributed atomic transaction on whether to commit or abort the transaction. The protocol achieves its goal even in many cases of temporary system failure, and is thus widely utilized. However, it is not resilient to all possible failure configurations, and in rare cases, user intervention is needed to remedy an outcome. To accommodate recovery from failure the protocol's participants use logging of the protocol's states. Log records, which are typically slow to generate but survive failures, are used by the protocol's recovery procedures. Many protocol variants exist that primarily differ in logging strategies and recovery mechanisms. Though usually intended to be used infrequently, recovery procedures compose a substantial portion of the protocol, due to many possible failure scenarios to be considered and supported by the protocol. In a "normal execution" of any single distributed transaction, i.e., when no failure occurs, which is typically the most frequent situation, the protocol consists of two phases: This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 22232 Audiopedia
Basic Time Stamp Ordering Protocol
Learn about Basic Time Stamp Ordering Protocol
Load balancing (computing)
Load balancing is a computer networking method for distributing workloads across multiple computing resources, such as computers, a computer cluster, network links, central processing units or disk drives. Load balancing aims to optimize resource use, maximize throughput, minimize response time, and avoid overload of any one of the resources. Using multiple components with load balancing instead of a single component may increase reliability through redundancy. Load balancing is usually provided by dedicated software or hardware, such as a multilayer switch or a Domain Name System server process. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
Views: 170 Audiopedia
Google I/O 2012 - SQL vs NoSQL: Battle of the Backends
Ken Ashcraft, Alfred Fuller Google App Engine now offers both SQL and NoSQL data storage -- but which is right for your application? Advocates of each try to settle the issue once and for all, and show some of the tricks for getting the most out of each. For all I/O 2012 sessions, go to https://developers.google.com/io/
Views: 352734 Google Developers
Tips and Tricks to Replication Server Part 02 of 05
mLogica, a leading database consulting firm with specialization in Sybase technologies, in partnership with the International Sybase User Group (ISUG), offers these tips as part of our Sybase ASE Replication Web Series
Views: 1219 mlogica
Best Practices for Data Replication Tool Upgrades
DataKinetics' Best Practices Series: Upgrade your DB2 and IMS Data Replication Solutions.
Views: 188 DataKinetics
Optimizing Applications, Schemas, and Query Design on Cloud Spanner (Cloud Next '18)
Cloud Spanner is a powerful product, but many users do not maximize its benefits. This talk highlights best practices, strategies for optimizing applications and workloads, and ways to improve performance and scalability. Through live demos, attendees will witness real-time speed-ups of transactions, queries, and overall performance. Additionally, this talk explores techniques for monitoring Cloud Spanner to identify performance bottlenecks. Come learn how to save thousands of dollars and maximize performance with Cloud Spanner. Event schedule → http://g.co/next18 Watch more Infrastructure & Operations sessions here → http://bit.ly/2uEykpQ Next ‘18 All Sessions playlist → http://bit.ly/Allsessions Subscribe to the Google Cloud channel! → http://bit.ly/NextSub
Code S Ro4 Match 1 Set 6, 2014 GSL Season 1 - Starcraft 2
Zest vs Rain: GOM eXP presents 2014 GSL Season 1 "The GSL" returns with slight change from its old format. GSL has been evaluated as one of the most prestigious StarCraft II league in the world since the release of StarCraft® II: Wing of Liberty™ in 2010. In 2014, the GSL, which has contributed to the global popularity of StarCraft II, will be the sole partner for StarCraft II WCS in Korea and the WCS points will be distributed in the same manner as the other regions. GSL's unique names for the different leagues such as Code S (Premier League), Code A (Challenger League), and Code B (Qualifiers) will be applied to all 3 seasons in 2014. Players who participate in the GSL will receive WCS points which will be applied to the WCS global rankings as well. The 2014 GSL season champions will now receive larger prize for winning it all. GSL Code S Champions will receive 70,000,000 KRW, which is far more than the WCS or GSL prize money payout had been before. This big prize reflects the competitiveness of the players in Korea, and as such, the GSL will be held with more prize money compared to other regions. We received feedbacks from player, teams, and other persons concerned regarding the 2013 WCS Season's prize pool and this too factored into the payout for 2014. Watch live and the rest at: http://twitch.tv/gsl Check out! GSL Global Championship http://gomexp.com/gsl Subscribe! Schedule: https://www.google.com/calendar/embed?src=gomgsl%40gmail.com&ctz=Asia/Seoul Facebook: http://www.facebook.com/officialexp Twitter: http://www.twitter.com/gomexp
Views: 3170 GOM eXP Official
Nimble Storage Introduces the Predictive Flash Platform and New All Flash Arrays
The Nimble Storage predictive flash platform ensures non-stop availability, unrivalled performance and cloud-like agility for your business, closing the app data gap. The platform combines Nimble's InfoSight analytics, unified flash fabric and timeless storage to ensure greater than 99.9997% uptime with 33% to 66% lower TCO compared to the competition. InfoSight predictive analytics prevents issues, predicts future needs, simplifies planning and avoids downtime by constantly collecting and monitoring huge amounts of data from its intelligent sensors. Nimble Storage unified flash fabric combines all flash and adaptive flash arrays in a single architecture for sheer performance, scalability and resilient storage. Timeless storage offers unwavering customer commitment, guarantees for all-inclusive software licensing, support and a capex or storage-on-demand pricing model. Nimble Storage's new 4U chassis with superior controllers and backplane, offers up to 2PB of effective capacity and 1.2M IOPS in just 12U! Learn about the new all-flash arrays and how the predictive flash platform can deliver data velocity for your enterprise at https://www.nimblestorage.com?utm_source=youtube
Views: 3663 Nimble Storage
What's Adaptive Query Processing in SQL Server? (Dear SQL DBA Episode 21)
Learn about emerging features to speed up SQL Server queries. Kendra talks about automatic index tuning and speculates about Adaptive Query Processing. Prefer a readable transcript? Get it here: https://www.littlekendra.com/2016/11/03/whats-adaptive-query-processing-dear-sql-dba-episode-21/
Views: 991 SQL Workbooks
openEHR Day - November 22, 2017 - Introduction and keynote "The Postmodern EHR"
Introduction, Jon Hoeksma CEO at Digital Health Intelligence Keynote: "The Postmodern EHR", Tomaz Gornik, CEO, Marand d.o.o. Want to learn more about Think!EHR Platform™ click here: http://bit.ly/2B8hepJ
Views: 985 Marand d.o.o.
Apps Script Crash Course: ScriptDb
In this episode Arun covers the basics of ScriptDb, a JavaScript object store that's built into Apps Script. He'll demonstrate how to store, retrieve, and query for records, as well cover best practices for organizing your data. You can download the source code of Arun's ScriptDB visualizer application here: https://github.com/entaq/GoogleAppsScript/tree/master/ScriptDbVisualizer
Views: 8350 Google Developers
Mike Olson: Opportunities Abound in the Big Data Space [Entire Talk]
Cloudera Co-Founder Mike Olson shares his insights on the present landscape and possible future of big data and the data management industry. In conversation with Ping Li of Accel Partners, Olson also discusses the advantages of building a business on top of open source technologies and the many surprising benefits of competition. View more clips and share your comments at http://ecorner.stanford.edu/authorMaterialInfo.html?mid=3223
Views: 3444 Stanford eCorner
Lec 19 | MIT 6.033 Computer System Engineering, Spring 2005
Transactions and Consistency View the complete course at: http://ocw.mit.edu/6-033S05 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 9347 MIT OpenCourseWare
RubyConf 2016 - Diving into the Details with DTrace by Colin Jones
RubyConf 2016 - Diving into the Details with DTrace by Colin Jones "Argh, why is this so slow?!" We've all asked questions like this without getting satisfying answers. And so we slog along, finding workarounds and architecting around the slow bits. But what if we had a friend who could see things we can't? Someone who could say whether our guesses were right, and what to look at next? DTrace is that friend, and it's here to help! In this talk, I'll show you how DTrace can answer incredibly general and specific questions about systems performance, and help us to generate new ones. Along the way, we'll see that it's easier to use than you might think!
Views: 585 Confreaks
Google Test Automation Conference - 11/11/2015
https://developers.google.com/google-test-automation-conference/2015/ GTAC 2015 will be held at the Google office in Cambridge Massachusetts, on November 10th and 11th, 2015. We will be choosing a diversity of attendees and presenters from industry and academia. The talks will focus on trends we are seeing in industry combined with compelling talks on tools and infrastructure that can have a direct impact on our products. We are committed towards creating a conference that is focused for engineers by engineers. In GTAC 2015 we want to continue to encourage the strong trend toward the emergence of test engineering as a computer science discipline across companies and academia alike.
Views: 8460 GoogleTechTalks
Joint Legislative Budget Hearing on Transportation - 01/29/15
Joint Legislative Budget Hearing on Transportation - 01/29/15
Views: 399 nysenateuncut
HSN | Customer Celebration with Colleen & Geoff 10.30.2016 - 07 PM
Customers select what items make the final cut of this show Prices shown on the previously recorded video may not represent the current price. View hsn.com to view the current selling price.SHOP NOW http://www.hsn.com
Views: 126 HSNtv
ANDROID (operating system) - WikiVidi Documentary
Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is mainly based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, Google has further developed Android TV for televisions, Android Auto for cars, and Android Wear for wrist watches, each with a specialized user interface. Variants of Android are also used on game consoles, digital cameras, PCs and other electronics. Initially developed by Android Inc., which Google bought in 2005, Android was unveiled in 2007, along with the founding of the Open Handset Alliancea consortium of hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. Beginning with th... ____________________________________ Shortcuts to chapters: 00:03:25: History 00:12:07: Interface 00:15:15: Applications 00:18:53: Memory management 00:19:42: Virtual reality 00:20:17: Hardware 00:24:45: Development 00:26:12: Update schedule 00:31:25: Linux kernel 00:35:24: Software stack 00:39:54: Open-source community 00:42:47: Scope of surveillance by public institutions 00:44:56: Common security threats 00:50:37: Technical security features 00:54:47: Licensing 00:58:39: Leverage over manufacturers 01:00:47: Reception 01:05:39: Market share 01:13:38: Adoption on tablets 01:17:51: Platform usage 01:18:24: Application piracy 01:19:45: Legal issues ____________________________________ Copyright WikiVidi. Licensed under Creative Commons. Wikipedia link: https://en.wikipedia.org/wiki/Android_(operating_system)
#AGDQ2015 Shovel Knight (Any%) by Capndrake
Run starts at 6:58 Watch live: http://www.twitch.tv/GamesDoneQuick Official page: https://gamesdonequick.com/ Runner(s): http://www.twitch.tv/capndrake Official Schedule: https://gamesdonequick.com/schedule Games Done Quick is a series of charity video game marathons. These events feature high-level play by speedrunners raising money for charity. Games Done Quick has teamed up with several charities in its five-year history, such as Doctors Without Borders and the Prevent Cancer Foundation. http://www.doctorswithoutborders.org/ http://preventcancer.org/ Donate here: https://gamesdonequick.com/tracker/donate/12 Donation Tracker: https://gamesdonequick.com/tracker/12 Uploading the runs here for convenience. @runner: Feel free to leave a comment or drop me a message if you want your run removed. @all Drop a comment if there's something wrong. Playlist here: http://youtube.com/playlist?list=PL_NsA72Bgro96PNeBjK7G07qQ1PtCTrVe Subtitles: Barely beta. Chatlog can be turned on/off optionally by en-/disabling captions. Check out the options, especially background and font opacity (transparency). Until youtube fixes their v3 API, they may be distributed across several languages, in alphabetic order.
Views: 12534 Yuuki DeName