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Deadlocks Подготовим две транзакции в разных окнах QA и, соответственно, в разных подключениях. Первая транзакция: 1 -- установим необходимый уровень изоляции SE RA SAC IO ISOLA IO LEVEL READ COMMI ED BEGI RA UPDA E bl SE X = 4 WHERE X = 4 –- обновим строку X=4 WAI FOR DELAY '00:00:10' UPDA E bl SE X = 6 WHERE X = 6 –- обновим строку X=6 COMMI RA Стоит заметить, что уровень изоляции в данном случае соответствует уровню изоляции, выставляемому по умолчанию, и делать его ниже крайне не рекомендуется. Оператор WAI FOR нужен для того, чтобы сервер исполнял команды не сразу друг за другом, а с разрывом в 10 секунд, чтобы мы успели переключиться во второе окно и стартовать вторую транзакцию, имитируя тем самым одновременность их выполнения. Вторая транзакция: 2 --- установим необходимый уровень изоляции SE RA SAC IO ISOLA IO LEVEL READ COMMI ED BEGI RA UPDA E bl SE X = 2 WHERE X = 2 –- обновим строку X=2 COMMI RA Естественно, совершенно не важно, какие значения мы запишем в X в этих транзакциях, в данном случае важно лишь условие выборки. | |
![]() Используется для ношения именных, магнитных или пропускных карточек. Крепление бейджа: карабин-петля. Подходит ко всем бейджам, имеющим 383 руб Раздел: Бейджи, держатели, этикетки ![]() Движение – это жизнь! Небольшая настольная кинетическая скульптура в собранном виде демонстрирует закон сохранения энергии, открытый 891 руб Раздел: Антистрессы ![]() Универсальный упаковочный материал. Препятствует повреждению товаров при ударе, предотвращает проникновение влаги и пыли, защищает от 423 руб Раздел: Фольга | ![]() Activities provide Cambridge Young Learner Exams preparation. Shipton P. Oxford University Press Oxford Read and Imagine 433 руб | ![]() Oxford Read and Imagine graded readers are at eight levels (Starter, Beginner, and Levels 1 to 6) for students from age 4 and older. Oxford University Press Oxford Read and Imagine 545 руб |
![]() They offer great stories to read and enjoy. Shipton P. Oxford University Press Oxford Read and Imagine 419 руб | ![]() Oxford Read and Imagine graded readers are at eight levels (Starter, Beginner, and Levels 1 to 6) for students from age 4 and older. Oxford University Press Oxford Read and Imagine 603 руб |
![]() At Levels 1 to 6, every storybook reader links to an Oxford Read and Discover non-fiction reader. Oxford University Press Oxford Read and Imagine 335 руб | ![]() Oxford Read and Imagine graded readers are at eight levels (Starter, Beginner, and Levels 1 to 6) for students from age 4 and older. Oxford University Press Oxford Read and Imagine 672 руб |
![]() Activities provide Cambridge Young Learner Exams preparation. Oxford University Press Oxford Read and Imagine 335 руб | ![]() They offer great stories to read and enjoy. Oxford University Press Oxford Read and Imagine 315 руб |
![]() Audio in a choice of American and British English is available for every reader. Shipton P. Oxford University Press Oxford Read and Imagine 298 руб | ![]() At Levels 1 to 6, every storybook reader links to an Oxford Read and Discover non-fiction reader. Shipton P. Oxford University Press Oxford Read and Imagine 591 руб |
![]() Club members, or from the Student' s Site at. At Levels 1 to 6, audio is available in CD packs for every reader. Ben, Rosie, and Max are at the recycling centre. Max drops his house key on a machine - oh no! Can Clunk help? What is Rosie' Oxford University Press Oxford Read and Imagine 577 руб | ![]() The first six Oxford Read and Imagine readers are publishing in January 2014, with more soon - teacher support materials and more information to follow. Shipton P. Oxford University Press Oxford Read and Imagine 419 руб |
![]() Activities provide Cambridge Young Learner Exams preparation. Oxford University Press Oxford Read and Imagine 315 руб | ![]() At Levels 1 to 6, every storybook reader links to an Oxford Read and Discover non-fiction reader. Shipton P. Oxford University Press Oxford Read and Imagine 315 руб |
![]() Activities provide Cambridge Young Learner Exams preparation. Oxford University Press Oxford Read and Imagine 298 руб | ![]() Activities provide Cambridge Young Learner Exams preparation. Shipton P. Oxford University Press Oxford Read and Imagine 433 руб |
![]() Young learners follow Rosie, Ben and Grandpa on their adventures and grow up with the characters as they read and learn. 591 руб | ![]() Listen while you read with the included Audio CD. Today Ben' s wearing new glasses. What happens when he plays ball with his friends in the school playground? And what happens when Grandpa makes Ben some fantastic new glasses? Oxford Read and 577 руб |
![]() At Levels Starter and Beginner, this audio is free to download from below for Oxford Teachers' Club members, or from the Student' s Site. At Levels 1 to 6, audio is available in CD packs for every Shipton P. Oxford University Press Oxford Read and Imagine 315 руб | ![]() They offer great stories to read and enjoy. Shipton P. Oxford University Press Oxford Read and Imagine 315 руб |
![]() Listen while you read with the included Audio CD. When Rosie and Ben wanted to understand an old cave painting, Grandpa took them back in time in his amazing van. 591 руб | ![]() At Levels Starter and Beginner, this audio is free to download from below for Oxford Teachers' Club members, or from the Student' s Site. At Levels 1 to 6, audio is available in CD packs for every Oxford University Press Oxford Read and Imagine 419 руб |
![]() Watch your students grow up with Rosie and Ben as they enjoy reading at the right level. Shipton P. Oxford University Press Oxford Read and Imagine 336 руб | ![]() Shipton P. Oxford University Press Oxford Read and Imagine 538 руб |
![]() A powerful partnership with the non-fiction series Oxford Read and Discover means students can explore the same topic through fact and fiction. Shipton P. Oxford University Press 577 руб | ![]() Penn J. Oxford University Press Oxford Read and Discover 433 руб |
![]() Oxford University Press Oxford Read and Discover 591 руб | ![]() New non-fiction graded readers for primary - 8-year-olds and up. Cross-curricular topics and colour photos make learning English through other subjects exciting. Oxford University Press Oxford Read and Discover 583 руб |
![]() Oxford University Press Oxford Read and Discover 618 руб | ![]() Why is exercise good for you? Oxford University Press Oxford Read and Discover 618 руб |
![]() Oxford University Press Oxford Read and Discover 315 руб | ![]() The readers are graded at four levels, from 3 to 6, suitable for students from age 8 and older. Oxford University Press Oxford Read and Discover 630 руб |
![]() The World of Science and Technology The Natural World The World of Arts and Social Studies Also available for each reader: Robert Q. Oxford University Press Oxford Read and Discover 583 руб | ![]() This exciting new series of non-fiction readers provides interesting and educational content, with activities and project work. Oxford University Press Oxford Read and Discover 569 руб |
![]() They can support Content and Language Integrated Learning (CLIL), and cover a broad range of topics, within three curriculum areas: Geatches H. Oxford University Press Oxford Read and Discover 645 руб | ![]() The Audio CD Pack contains a copy of the book along with an audio CD with a recording of the complete text in both British and American English. Oxford University Press Oxford Read and Discover 583 руб |
![]() What can you see in the sky? What are stars? Read and discover more about the world! Khanduri K. Oxford University Press Oxford Read and Discover 419 руб | ![]() Two new levels for younger or lower-level students. 577 руб |
![]() How tall can a skyscraper be? Oxford University Press Oxford Read and Discover 577 руб |
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