Recovery, logging and the transaction log
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The document discusses transaction log architecture, log records, checkpoints, transaction log operations, recovery and crash recovery, and recovery models and minimal logging in SQL Server. It covers topics such as how the transaction log file is created and grows, what log records are and where they are stored, how checkpoints work and the different types of checkpoints, how recovery brings databases to a consistent state after failures, and the different recovery models including minimal logging.
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一、工作未确定，回国需先给父母、亲戚朋友看下文凭的情况，办理一份就读学校的毕业证【微信bwp0011】文凭即可
二、回国进私企、外企、自己做生意的情况，这些单位是不查询毕业证真伪的，而且国内没有渠道去查询国外文凭的真假，也不需要提供真实教育部认证。鉴于此，办理一份毕业证【微信bwp0011】即可
三、进国企，银行，事业单位，考公务员等等，这些单位是必需要提供真实教育部认证的，办理教育部认证所需资料众多且烦琐，所有材料您都必须提供原件，我们凭借丰富的经验，快捷的绿色通道帮您快速整合材料，让您少走弯路。
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
【关于价格问题（保证一手价格）】
我们所定的价格是非常合理的，而且我们现在做得单子大多数都是代理和回头客户介绍的所以一般现在有新的单子 我给客户的都是第一手的代理价格，因为我想坦诚对待大家 不想跟大家在价格方面浪费时间
对于老客户或者被老客户介绍过来的朋友，我们都会适当给一些优惠。
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The importance of sustainable and efficient computational practices in artificial intelligence (AI) and deep learning has become increasingly critical. This webinar focuses on the intersection of sustainability and AI, highlighting the significance of energy-efficient deep learning, innovative randomization techniques in neural networks, the potential of reservoir computing, and the cutting-edge realm of neuromorphic computing. This webinar aims to connect theoretical knowledge with practical applications and provide insights into how these innovative approaches can lead to more robust, efficient, and environmentally conscious AI systems.
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Claudio Gallicchio is an Assistant Professor at the Department of Computer Science of the University of Pisa, Italy. His research involves merging concepts from Deep Learning, Dynamical Systems, and Randomized Neural Systems, and he has co-authored over 100 scientific publications on the subject. He is the founder of the IEEE CIS Task Force on Reservoir Computing, and the co-founder and chair of the IEEE Task Force on Randomization-based Neural Networks and Learning Systems. He is an associate editor of IEEE Transactions on Neural Networks and Learning Systems (TNNLS).
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- 1. ©2011 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice Recovery, Logging and the Transaction Log Miroslav Dimitrov
- 2. Agenda • Transaction Log Architecture • Log Records • Checkpoints • Transaction Log operations • Recovery and Crash Recovery • Recovery Models and Minimal Logging
- 3. Transaction Log Architecture • Creating and growing the log file • Log is always zero-initialized • TF 3004 and 3605 • VLFs, Log blocks and LSNs • Undocumented DBCC LOGINFO • DBCC SQLPERF (Logspace)
- 4. Log Records • What are they? • Where they stayed? • Are they all part of transactions? • TVF fn_dblog (startLSN,endLSN) – TF 2537 • Compensation records (rollback) – only roll forward
- 5. Conundrum If a full backup is being taken, then you have transaction updated 100 000 records but it is rolled back why is the diff backup so large? Surely nothing has changed.
- 6. Checkpoints • Why they exists? • Thresholds 20 ms and 100 ms?! • Log records during checkpoint • Log records are written to disk via three ways: – When we have commit/rollbacked transaction – When a data file page is written to disk – When a log block hits the maximum of 60 kb size and must be flushed to disk
- 7. Checkpoints (cont.) • Types: – Automatic – Indirect (new in SQL 2012) – Internal – Manual • TF 3502 (for which db), 3504 (write latency), 3605 • XE Events - checkpoint_begin and checkpoint_end
- 8. Transaction Log operations • VLF is either active or inactive • DBCC OPENTRAN • VLF is made inactive by log clearing (truncation) • Circular nature of log • log_reuse_wait_desc in sys.databases – why log clearing did not succeed last time it was attempted
- 9. Recovery and Crash Recovery • Recovery brings db to a consistent point in time • Types: – Crash recovery after a system failure – Recovery at the end of restore – Recovery after a failover (CL, AG, Mirroring) • REDO • UNDO
- 10. Recovery and Crash Recovery (cont.) • Recovery during restore • Crash Recovery • Where the crash recovery stops?! • How SQL is recovering DBs? – TF 3408 single thread • Fast Recovery (from SQL 2005 onwards – only ENT) – does not apply for restore
- 11. Recovery Models and Minimal Logging • Minimal Logged vs Efficiently Logged • FULL • SIMPLE • BULK-LOGGED (why to use it only temp) • Minimally Logged: – Creating, Dropping, Rebuilding indexes (reorganize is always fully logged) – Bulk operations – bcp, bulk insert etc.
- 12. Recovery Models and Minimal Logging (cont.) • pseudoSimple recovery model? • Is switching between FULL and BULK-LOGGED breaking the log backup chain? • Deferred drop and TRUNCATE table (two ways)
- 13. Questions?
- 14. Demo time