SQL Server 2014 had the adequacy to abundance database backups on the Microsoft Azure platform, which brings cogent extenuative in accumulator bulk and minimizes administering effort. The adeptness to accumulate database backups on Azure was added added to accommodate adversity accretion by assuming asynchronous archetype amid the on-premise database and the billow database backup. This accessory reduces CAPEX and OPEX bulk of physically advancement added accouterments in the abstracts centers.
In the aing adaptation of SQL Server, SQL Server 2016, Microsoft introduces a new feature, alleged Amplitude Database. This affection brings an adeptness to extend the “on-premise” SQL database to the Azure platform. This affection allows the movement of actual abstracts from on-premise SQL database to an Azure SQL database clearly while acceptance admission to the abstracts seamlessly. This commodity explains business use cases, business allowances and abstruse accomplishing of the “Stretch Database” feature.
The afterward are use cases for Amplitude Database feature.
The afterward are a few business allowances with the accomplishing of Amplitude Database feature.
The afterward are limitations with the Amplitude Database affection as of SQL Server 2016 CTP Adaptation 2.2.
Both of these limitations are accepted to be taken affliction in the SQL Server 2016 RTM version.
The Amplitude Database affection allows the movement of balmy and algid abstracts automatically to the Azure SQL database platform. This affection is benign to accumulate on-line transactional abstracts for best periods of time central on-premise accumulator and move actual abstracts to billow storage. The concern achievement is bigger while accessing transactional abstracts from the on-premise database as the concern optimizer alone has to action a bound bulk of data. The actual abstracts will be migrated to Azure SQL database clearly and the applicant applications will be able to concern the abstracts seamlessly afterwards acute any changes to appliance code.
The afterward are prerequisites to advantage the Amplitude Database feature.
Note:* – Microsoft recommends using database-level firewall rules wherever accessible to accomplish the user database added portable. The server-level firewall rules may be acclimated back there are abounding databases absolute with aforementioned admission requirements.
Note: ** The Amplitude Database Advisor is allotment of SQL Server 2016 Advancement Advisor. SQL Server 2016 Advancement Advisor is a standalone apparatus that enables users of above-mentioned versions to run a set of advancement rules adjoin their SQL Server database to define breaking and behavior changes and deprecated appearance as able-bodied as accouterment advice with the acceptance of new appearance such as Amplitude Database. This apparatus does not appear forth with SQL Server 2016 CTP2, can be downloaded from: here.
Footfall 1: Set the “remote abstracts archive” instance-level agreement constant application sp_configure, as mentioned below.
With this agreement is done, one can accredit Amplitude Database affection for database, drift data, and concern abstracts on the alien endpoint.
Footfall 2: Accredit Amplitude affection for the database application either SSMS astrologer or T-SQL.
Use can use the SSMS astrologer to baddest the database and accommodate all-important server area advice and login accreditation for Azure. This will actualize a defended affiliated server ogue on the bounded SQL Server instance to the alien SQL database on cloud.
You will charge to actualize a credential for Azure SQL database application the SSMS astrologer (at the time of enabling Amplitude Database), or you can use the T-SQL apparent below.
Accredit Amplitude Database affection from adept database, as apparent below.
Footfall 3: Run the Amplitude Database Advisor to yze the applicant tables for Amplitude Database enablement. Select all the tables that crave amplitude enablement in the SSMS wizard, or use the afterward T-SQL cipher to accredit for anniversary table.
The afterward are a few checks for the Amplitude Database setup.
First, ysis the amount of the column, is_remote_data_archive_enabled, in the sys.databases and sys.tables system tables (0 – not enabled, 1 – enabled) for anniversary database and anniversary table to apperceive whether the accurate database or table is stretch-enabled.
Analysis the cachet of abstracts clearing to Azure for every database and table by querying the sys.dm_db_rda_migration_status DMV.
Use the archive views sys.remote_data_archive_databases and sys.remote_data_archive_tables to account all the remote databases and tables that are acclimated by bounded Stretch-enabled database.
Amplitude enablement does not change the permission archetypal for an absolute database. The user logins will be able to admission the Azure SQL database through the bounded instance database only. User logins cannot affair queries anon to the alien endpoint (Azure) through the affiliated server definition.
As of the CTP adaptation 2.2, SQL Server 2016 supports only shallow backup for a Stretch-enabled database. i.e., the database advancement does not accommodate abstracts migrated to the alien server, but contains alone bounded abstracts and acceptable abstracts at that point in time back the advancement runs, forth with the alien endpoint location. The adeptness to take complete advancement is accepted to be accessible with SQL Server 2016 RTM version.
Back the bounded advancement has been restored, this operation restores the bounded abstracts and acceptable abstracts to the database. Afterwards restore operation is completed, the bounded database contains bounded abstracts and acceptable abstracts from the point back the advancement ran. It is adapted for the bounded database instance to affix to the Azure SQL database for abstracts reconciliation. Establish affiliation to the Azure SQL database by application a stored action call, as apparent below
Already the affiliation is accustomed with the alien SQL database, Amplitude Database attempts to accommodate acceptable abstracts in the bounded database with alien abstracts by creating a archetype of the alien abstracts on the alien endpoint and bond it with the bounded database.
Already adaptation runs, the bounded database and the alien endpoint are in a constant state. Then, the antecedent archetype of alien abstracts can be deleted. The abstracts restore action can be represented as below.
Fig 1: Abstracts Restore Action on to Stretch-enabled database
Actuality are the accomplish to chase to attenuate Amplitude Database on a table.
Footfall 1: In adjustment to attenuate Amplitude Database affection for a table, abeyance abstracts clearing on the table. This can be done either by application SSMS (select the table, right-click à Go to Tasks — Amplitude — Pause) or by application T-SQL, as apparent below.
Footfall 2: Actualize a new bounded table with some approximate name in the aforementioned database action as the Stretch-enabled table.
Footfall 3: Archetype the abstracts from the Stretch-enabled table into the new table by application an INSERT INTO <new table>… SELECT FROM <Stretch-enabled table> statement.
Footfall 4: Drop the Stretch-enabled table.
Footfall 5: Rename the new table with the aforementioned name as the Stretch-enabled table that was alone in the antecedent step.
The Amplitude database affection can be disabled for a database alone back all the tables with in the database are no best enabled with the Amplitude database feature. This affection can be disabled for a database application SSMS (right-click database, baddest Tasks — Attenuate Database for Stretch) or T-SQL statement, as apparent below
The database on bounded instance can be alone application DROP DATABASE statement. However, the alien Azure SQL database can be alone via the Azure Management aperture only.
The Amplitude Database affection comes with afterward limitations.
The afterward are a few accepted issues encountered while implementing the Amplitude Database feature.
Firewall settings – Verify the firewall rules configured for the database in the Azure Management Portal. In case of abortion to affix with the Azure SQL database, try some of the following:
Abstracts movement: Rows from the Stretch-enabled table are not actuality migrated to Azure SQL database. Verify the following:
Concern performance: Queries accessing the Stretch-enabled table are active apathetic afterwards Amplitude enablement. Verify the following:
The “Stretch Database” affection alien in SQL Server 2016 is a way to extend your on-premise SQL Server database to Azure platform. This affection brings cogent bulk accumulation to organizations by befitting algid abstracts on billow accumulator and added acquaintance for users while accessing on-line transactional abstracts due to advance in concern performance.
1. Amplitude database – https://msdn.microsoft.com/en-us/library/dn935011.aspx
2. Accredit Amplitude Database – https://msdn.microsoft.com/en-IN/library/mt163698.aspx
3. Amplitude Database Advisor – https://msdn.microsoft.com/en-us/library/dn935004.aspx
4. Manage and troubleshoot Amplitude Database – https://msdn.microsoft.com/en-IN/library/mt484151.aspx
5. Advancement and restore Stretch-enabled databases – https://msdn.microsoft.com/en-IN/library/dn934993.aspx
6. Attenuate Amplitude Database – https://msdn.microsoft.com/en-IN/library/dn935010.aspx
7. Abeyance and resume Amplitude Database – https://msdn.microsoft.com/en-IN/library/dn934998.aspx
8. How to: Configure firewall settings on SQL Database – https://azure.microsoft.com/en-us/documentation/articles/sql-database-configure-firewall-settings/#next-steps
9. Azure SQL Database firewall – https://azure.microsoft.com/en-us/documentation/articles/sql-database-firewall-configure/
10. Azure SQL Database Account Tiers and Achievement Levels – https://azure.microsoft.com/en-us/documentation/articles/sql-database-service-tiers/?rnd=1
About the Author: Suresh Yaram is a Abstracts Architect with 16 years of acquaintance in Abstracts Management space. Suresh works in Abstracts Modeling (ER Modeling/Dimensional Modeling), Abstracts Architecture and Database Design and Development of OLTP Systems and OLAP systems application industry accepted tools, technologies, and frameworks. His areas of interests accommodate Abstracts Modeling, ETL Action Design, Business Intelligence, Big Data, Abstracts Science etc.,. Currently, Suresh works with Computer Science Corporation (CSC) India Limited, Hyderabad, India as Abstracts Architect.
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