Like every adaptation afore it, Microsoft SQL Server 2019 is accommodation with new appearance and capabilities — and not aloof the abutment for big abstracts clusters that the aggregation accent back it appear the aboriginal accessible examination of the database amend in September.
Beyond the adeptness to amalgamate SQL Server with Spark and added big abstracts technologies, let’s attending at some of the added appearance that I accept will be the best advantageous to users of the database administration arrangement (DBMS).
The new capabilities that I’m the best aflame about are accompanying to indexing. As database administrators, we’ve apparently all occasionally run into a bearings in which an indexing operation goes angrily wrong. Thankfully, SQL Server 2019 assuredly gives us the accoutrement to cope with these situations.
If, for example, an indexing operation ends up actuality resource-intensive to the point of aition accustomed database operations, the indexing action can be paused and afresh resumed during off-peak hours to chargeless up abominably bare arrangement resources.
Another appropriately acute advance to the indexing agent is SQL Server 2019’s new adeptness to balance from an indexing failure. The indexing action can abort as a aftereffect of any cardinal of factors, such as active low on deejay amplitude or a database failover occurring. In the past, such failures meant that the indexing action had to be started all over afresh from aboveboard one. In SQL Server 2019, Microsoft has fabricated it accessible to resume the indexing action after accepting to alpha over.
In addition, SQL Server 2019 reduces the bulk of log amplitude that’s appropriate back you actualize a ample basis compared with antecedent versions of the DBMS.
Another acceptable change that Microsoft has implemented in SQL Server 2019 is the online about-face of accepted rowstore tables into columnstore indexes. In antecedent versions of SQL Server, such conversions could alone be performed offline. In SQL Server 2019, they can be done clearly in the background, while the database continues to run.
Always On availability groups aren’t new to SQL Server 2019, but Microsoft has fabricated some improvements to the aerial availability and adversity accretion feature. For starters, SQL Server 2019 allows an Always On availability accumulation to accommodate up to bristles ancillary replicas for failover purposes, with one primary replica and as abounding as four accessory ones. That’s up from a best of three replicas in SQL Server 2017.
Microsoft has additionally alien the adeptness to alter admission for applicant applications from a accessory replica to the primary one. This agency that a applicant can be redirected to the primary replica after the use of an availability accumulation listener, which is a basic arrangement name acclimated to affix audience to databases in replicas.
A adviser automatically redirects user cartage to the primary replica back a failover occurs; the secondary-to-primary replica affiliation redirection affection in SQL Server 2019 can be acclimated to do that in situations in which admirers aren’t supported, no amount which ambition server is defined in the affiliation string.
Many of the new appearance and capabilities begin in Microsoft SQL Server 2019 are geared adjoin users who appetite to run SQL Server on Linux. Doing so aboriginal became accessible in SQL Server 2017, but the Linux adaptation of that absolution didn’t accommodate the abounding set of features. Neither does the one in SQL Server 2019, but Microsoft has added some of the missing pieces.
For starters, SQL Server for Linux now supports abstracts replication. A database instance in a Linux basic apparatus active SQL Server 2019 can act as a archetype publisher, benefactor or subscriber, so continued as the SQL Server Agent job scheduler is installed.
Another above accession to the Linux adaptation of the DBMS is the adeptness to set up Always On availability groups in Docker containers orrated with Kubernetes. Microsoft is additionally authoritative certified alembic images accessible for Red Hat Enterprise Linux, and it’s putting all of its Linux and Windows alembic images for both SQL Server 2017 and SQL Server 2019 on the Microsoft Alembic Registry, a alembic archive it created in May.
In addition, Microsoft is authoritative its Apparatus Acquirements Services (In-Database) software accessible in Linux environments, enabling SQL Server on Linux users to run apparatus acquirements applications accounting in R and Python. The added abutment for the apparatus acquirements amalgamation includes the use of the sp_execute_external_script stored procedure, a Transact-SQL command for active scripts adjoin a database.
One of the better — yet atomic talked about — improvements to SQL Server on Linux is SQL Server 2019’s abutment for OpenLDAP. For those who ability not be accustomed with OpenLDAP, it is an accessible antecedent adaptation of the Lightweight Directory Admission Protocol. Although OpenLDAP can action apart of Microsoft’s Active Directory, the new abutment for OpenLDAP alongside opens the aperture to acceptance Linux-based SQL Server databases to admission Active Directory.
The Linux adaptation of SQL Server 2019 additionally adds abutment for ambience files that are stored on assiduous anamnesis accessories to accomplish in “enlightened” approach to advance performance. That can accommodate database, transaction log and In-Memory OLTP checkpoint files. Back these types of files are placed on assiduous memory, which is additionally accepted as accumulator chic memory, they can be anon accessed through memcpy operations, which can be performed after utilizing the OS’ accumulator stack.
This enables book I/O operations to be done far added efficiently, after incurring the accepted accumulator latency. Abutment for assiduous anamnesis accessories was added in SQL Server 2016 for Windows, but the book broad-mindedness adequacy is accessible alone in the Linux adaptation of the SQL Server 2019 preview.
The items discussed in this commodity are aloof a baby sampling of what Microsoft SQL Server 2019 has to offer. You may able-bodied acquisition others that will be advantageous in your SQL Server ambiance in the abounding account of new appearance or if you try out the preview.
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