With the large number of high-concurrency access, massive data processing and other scenarios more and more, how to achieve the high availability of web sites, scalability, scalability, security and other goals are becoming more and more important.
With the large number of high-concurrency access, massive data processing and other scenarios more and more, how to achieve the high availability of web sites, scalability, scalability, security and other goals are becoming more and more
This text connection: http://blog.csdn.net/bluishglc/article/details/7612811, reprint please indicate the source!1.XAXA is a specification of distributed transactions presented by the X/open organization. The XA specification primarily defines the
The original Article connection: http://blog.csdn.net/bluishglc/article/details/7612811, reproduced please indicate the source!
1. XA
XA is a distributed transaction specification proposed by X/Open organizations. XA specifications mainly define
Transaction and two phase commit, three-phase commit protocol (finite state automata)
• Acid for 1 transactionsA transaction is the fundamental to ensure that a database is permanently changed from one consistent state to another, where acid is the
I. BACKGROUNDThe first chapter of this book, distributed architecture, writes from a stand-alone acid to a distributed cap. See the previous article. This is the second chapter of the consistency agreement part, divided into two pieces of finishing.
Transferred from Http://blog.163.com/[email protected]/blog/static/1394892972011611111559962/#userconsent #1. Explicit DB CommitThe explicit DB commit does not have a corresponding ABAP statement to execute the DB commit, which is done by the usual
Source: http://www.ruanyifeng.com/blog/2016/01/commit_message_change_log.htmlEvery time Git commits the code, it writes a commit message (the commit), otherwise it is not allowed to commit.
-m "hello world"
The parameters of the above
Because transactions need to implement acid, that is, atomicity, consistency, isolation, and durability, a certain mechanism is required to ensure that transactions are committed in stages.
XA: XA protocol, which specifies the Transaction Manager
[Oracle]-[impact of COMMIT on indexes]-from trace, we can see the impact of COMMIT on indexes. Recently, due to work requirements, there is a task involving data migration, therefore, I have been paying attention to the time-consuming issue of
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