x):# part 1getlock(key=x,owner=T,mode=SIREAD)ifthereisaWRITElock(wl)onxsetwl.owner.inConflict=truesetT.outConflict=true# part 2existingSIcodeforread(T,x)# part 3foreachversion(xNew)ofxthatisnewerthanwhatTread:ifxNew.creatoriscommittedandxNew.creator.outConflict:abort(T)returnUNSAFE_...
看这篇文章的主要目的是为了了解《Serializable Isolation for Snapshot Databases》[1]的出发点。说来惭愧,在看完看论文的第一二节之后,后面的程序分析大致都略过了。不过个人还是挺推荐大家读一下整篇文章的内容的,主要原因如下: 文章从最基本的概念开始描述,并且整篇文章的连续性也很好 ...
Multiple database replication protocols have used replicas supporting the snapshot isolation level. They have provided some kind of one-copy equivalence, but such concept was initially conceived for serializable databases. In the snapsho... FD Muñoz-Escoí,JM Bernabé-Gisbert,RD Juan-Marín,.....
Serializable Isolation for Snapshot Databases Categories and Subject DescriptorsCahill, Michael JFekete, Alan D
PostgreSQL在版本9.2之后根据论文《Serializable Isolation for Snapshot Databases》提出的算法实现了Serializable隔离级别,可以说是这篇论文的开源实现。 回想一下《Serializable Isolation for Snapshot Databases》论文中的内容,为了实现Serializable,我们需要追踪rw-dependency,这不仅需要记录每行的修改事务,同时也要记录每行...
Serializable isolation for snapshot databases Many popular database management systems implement a multiversion concurrency control algorithm called snapshot isolation rather than providing full serial... MJ Cahill,U R?Hm,AD Fekete - 《Acm Transactions on Database Systems》 被引量: 284发表: 2009年 ...
Determination of serialization order for Serializable Snapshot Isolation (SSI).Time-travel queries on consistent database state for SSI.Sharpness of results: what can happen in non-SSI executions.A parametrized version of SSI that bounds the settle-time in serialization order....
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TRANSACTION_READ_COMMITTED; case REPEATABLE_READ: return Connection.TRANSACTION_REPEATABLE_READ; case SNAPSHOT: // TODO: not accurate for all databases. return Connection.TRANSACTION_SERIALIZABLE; case SERIALIZABLE: return Connection.TRANSACTION_SERIALIZABLE; } } ...
If the key does not exist, then the ‘range’ lock is taken on the ‘next’ key both for ...