Caching Getting Data In general, getting data from a service once is better than getting it twice. Consider the example of an MVC web application running in a web role that has already retrieved a 50MB blob from the storage service to serve as content to a user. The application could then retrieve that same blob every time a user requests it, or it could cache it locally to disk and reuse the cached version for subsequent user requests.
Automatic Seeding will come as a breath of fresh air to you. Whether you used the AG wizard or scripts to create AGs, you likely created a file share first where the backup files will be written to, and from where the secondary pick up the backup files to restore.
With automatic seeding, gone are the file share and the numerous IOs to the file share. Instead, automatic seeding uses the database mirroring endpoints to stream the bytes after reading from database files to the secondary and apply them.
Getting rid of the file share and the IO involved with it, automatic seeding dramatically reduces the transactional writing activities time for AGs. You can choose mixed seeding techniques in an AG, i. AG wizard selection to generate script for automatic seeding This selection is not intuitive, given your ultimate goal, but is a workaround till the future version of the wizard includes an option for automatic seeding.
You need to make two changes to the generated script: Adding a replica transactional writing activities an existing AG To use automatic seeding while adding a replica to an existing AG, add the replica as you would normally do, and after the replica is added, do the following two steps to start the seeding: This helps reduce the end-to-end seeding time for an AG.
Figure 2 compares the time taken to seed a database of about GB through backup-restore with backup compression and automatic seeding. Use trace flag to compress the seeding stream.
As illustrated in Figure 3, you can see significant reduction in network traffic. Reduced network traffic using seeding compression Important to Know There are a couple of things to be aware of while using automatic seeding.
Transaction Log cannot be Truncated while Seeding Automatic seeding blocks log truncation. If there is no or little workload on the primary while seeding the secondary, then there may be no impact. But if there is a workload on the primary generating significant transaction log, then you may run the risk of filing up the transaction log file.
Be aware of the workload volume, log growth rate, and time to seed the replica s while using automatic seeding. When using automatic seeding be aware that there is a known issue with diagnosing the reason for blocked log truncation.
This is a known issue, and is expected to be addressed in the product soon. However, there is a known issue on this. While seeding with compression, this column shows a value of 0 meaning no compressionwhich is incorrect.
This known issue is expected to be addressed in the product soon. My Wish List Given that automatic seeding reduces the seeding time significantly, it is a very useful feature.
I have three items on my wish list to make it practical for more scenarios. The Create AG wizard to have an option to specify automatic seeding.
Generating the script through the wizard and then editing it cumbersome and error-prone. An option in the wizard to specify automatic seeding will significantly improve user experience.
Should be able to truncate the log while seeding in progress. Filling up the transaction log file or the log drive is nightmare for any database. All activities on the database will come to a halt till log space is cleared. To eliminate that risk, it will be great if automatic seeding can read from transaction log backups, and allow the transaction log to be truncated while the seeding is in progress.
The Create AG wizard and the DDL should provide an option to enable compression when using automatic seeding, instead of a trace flag trace flags are instance level settings, whereas automatic seeding is scoped to an AG.
What is on your wish list?General instructional activities. To correspond with a typical reading lesson, comprehension strategy instruction can be organized into a three-part framework, with specific activities used before, during, and after reading..
Providing instruction such as the following example allows students to see, learn, and use a variety of comprehension strategies as they read. Transactional writing is writing that is part of a chain of written communication intended to communicate, persuade or inform.
Often transactional writing takes the form of letters or emails and is part of a written conversation. Other types of transactional writing include grant proposals and job.
Microsoft Azure Storage Performance and Scalability Checklist. 12/08/; 39 minutes to read Contributors. In this article Overview. Since the release of the Microsoft Azure Storage services, Microsoft has developed a number of proven practices for using these services in a performant manner, and this article serves to consolidate the most important of them into a checklist-style list.
Ta Today: A New Introduction to Transactional Analysis. (Second Edition) Ian Stewart, Vann Joines 2nd Revised edition Edition. Learn about transaction processing systems, processing systems components and different service-oriented architecture approaches, including representational state transfer.
Jun 28, · This selection is not intuitive, given your ultimate goal, but is a workaround till the future version of the wizard includes an option for automatic seeding.