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efficiency is very low. However, in the case of multi-stream concurrency, because the original stream is not associated with the stream, i/O executed at the source end may be transferred to the peer end but then executed. In this case, more complex logic needs to be introduced to ensure that the data synchronized to the past is executed in sequence. There are two ways to consider this. One is to ensure RPO, maintain strong consistency among multiple
terms of normal running time and reliability? What are our requirements for RTO/RPO (recovery time and recovery target point? After the configuration is completed, the configuration will be rich. What you need to do is to find answers to key questions that will guide us (or even third parties) design a new infrastructure that can bear the necessary load and meet the enterprise's own policy requirements. If you do not provide all the information for
application.The captured data is then copied to the remote location.The remote node processes a copy of the data and delays the return acknowledgment to the source copy.Because replication performance is no longer in the application IO path, the response speed and distance of the remote site are less important factors. If the source data is lost and the destination copy of the data is still in the buffer without leaving the source, there is a risk of data loss.With a higher version than zero
is not counted as downtime.RPO (Recovery point Objective, target recovery points)RPO indicates how much data loss is tolerated. Typically, you can make your data non-lost by just doing a backup. However, when a disaster occurs, recovering from a backup causes the database to be unavailable at this stage, and if the recovery time is particularly long, the loss may be more severe than the loss of a small amount of data. Especially for databases with ve
various failure scenarios. During the planning phase, the architects and administrators of the solution will determine the deployment requirements. In particular, site recovery requirements. They determine the location to use and the desired recovery SLA targets. The SLA will identify two specific elements, and these two elements should be the basis for designing high availability and site recovery solutions: Recovery time Objective (RTO) and Recovery point Objective (
Data processing becomes more and more important and critical in modern enterprise operations, and may even become a bottleneck of enterprise development. the importance of data protection is self-evident. if an enterprise does not have a good data protection solution or strategy, once important data is lost, the consequences will be disastrous, with economic losses. Major server hardware vendors (such as IBM and HP) provide good data protection policies (hardware or software ). redundant Ar
) Data backup is a data recovery service. Before establishing a data backup plan, you should first consider whether the backup can be used to effectively restore data (within the time range allowed by downtime ). the RPO (Recovery Point Objective) and RTO (Recovery Time Objective) permitted by the system should also be considered, the system recovery tool or solution used allows the system or data to be restored to a normal state, the time required ).
, this is related to the cost, the more redundancy, the higher the cost. Disaster backup and recovery have two indicators: RPO (rediscoveryPoint Objective), One is RTO (recoveryTime Objective), That is, the data loss rate and the recovery interval. For traditional SANOr remote backup, these two indicators basically depend on the cost, the better the indicator, the higher the cost, Google in this regard, the use of synchronous replication technology, s
storage space, restore timeliness.(8) Data GuardDG, is one of the data storage disaster solution, through the construction of the same-city disaster preparedness and remote disaster preparedness environment, and thus achieve real-time protection database.Professional terminology:(1) RPOThe RPO (Recovery point Objective, Recovery points target) refers to the point at which the recovered data corresponds when the service is restored.(2) RTOThe RTO (Rec
account, click "admin" in the upper right corner, and select the "plugins" Link under "general" in the left column on the new page, you can upload and install the compiled Python egg in the upper-right corner of the "Management plug-in" page, and then edit TRAC. configure the INI file.Next, we will officially start introducing plug-ins, which are categorized by experience and functions. Experience autocompleteusers Home page: http://trac-hacks.org/wiki
1. install Tomcat, version 4, and later. Note that it is best to select a folder without spaces during installation and put it in the root directory. For example, D:/tomcat55 /. This is mainly because some wiki plug-ins have requirements for this. 2. download jspwiki: http://www.jspwiki.org/wiki/jspwikidownloaddownload file: jspwi%2.2.33-bin.zip 3. copy the jspwiki In the compressed package. war to Tomcat's
simple, fast and reliable software. Click [here] (https://github.com/golang/go/wiki/GoUsers) to see what good companies are using the go language to drive their business. This article will provide you with all the information necessary to help developers learn more about the best choice for developing WEB applications using the Go language. This article contains the most detailed framework comparisons, from a variety of perspectives, such as populari
Previously, moinmoin1_topedition was installed in Windows XP as its local Wiki (using MoinMoin desktop edition as a personal local knowledge accumulation tool). Because Ubuntu and Winxp systems are used, it is hoped that the two systems share the same wiki program without data synchronization, which will cause trouble for Data Query and save the maintenance of data synchronization. MoinMoin does not require
Don ' t Repeat yourself (DRY)DRY is one of the simplest laws and is the easiest to understand. But it can also be the hardest to apply (because to do so, we need to do a lot of work on generic design, which is not an easy task). It means that when we find some similar code in two or more places, we need to abstract their generality into a unique new method, and change the existing code so that they can invoke the new method with some appropriate parameters.Reference : http://en.wikipedia.org/
Original article: team collaboration with GitHub GitHub has become the cornerstone of all open source software. Developers like it, collaborate based on it, and constantly develop amazing projects through it. Except ?? Code hosting, GitHub's main attraction is to use it as a collaborative development tool. In this tutorial, let's take a look at some of the most useful GitHub functions, especially those that make the team work more efficient, more productive, and very important and fun! GitHub a
A good programmer generally consists of four aspects: Operation Skills, Knowledge Level, experience layer and ability. I would like to share with you some of the principles in design. I think these things are lessons learned from long-term experience. Every programmer should understand these principles. However, we recommend that you do not adopt dogmatism. You must consider the actual situation when using it. In fact,The following principles can not only be applied to software development, but
1,363 Fork895 Renfufei edited this page in Sep 2014 · Wuyi Revisions PagesBenchmark_aliyun Contributors dbcp Migration Druid Change Log Druid Monitor design druiddatasource dynamic configuration druiddatasource Statistic data log output format Druiddatasource Configuration Druiddatasource Configuration Properties list Druid How to configure the master-slave, have automatic recognition SQL Read only write policy. Druid Support for fair mode issues like WebLogic multiple data source Druid Locks
Foundation was set up on the Wikipedia project, and that the server, which was originally placed in Wales and Bomis, was also handed over to the Wikimedia Foundation for use. As a non-profit organization, the Wikimedia Foundation can donate money to sustain its own development.as a concept of "wiki" . I don't know what it was like when Wales made the big decision not to publish commercials on Wikipedia, even when we were speculating with malice, per
"Emacs is not an editor. emacs is a way of thinking about the world, and as such is a way of thinking about editors. the process of editing is Emacs, but Emacs is more than the process of editing. when you ask what Emacs does, youAre asking a question with no answer, because Emacs doesn't do, it is done to. emacs just is... I hope this makes things clearer. "-Scott Dorsey In short, Emacs is a text editing software, but it can be used to write programs, write papers, write web pages, write blogs
done.Again, the partitioned partition is formatted. In fact, and win installation is the same.# MKFS.EXT4/DEV/SDAIt's important to remember that formatting is here, and if it's not formatted, the direct mount will promptMount:/mnt:wrong FS type, bad-option, bad Superblock ON/DEV/SDA, missing-codepage or helper program, or other error.If you know a little bit about the order, you can actually read it. It says that you may not have formatted the device.Then the
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