Azure SQL Database (public cloud) As seen in the diagram below, each offering can be characterized by the level of administration you have over the infrastructure, and by the degree of cost efficiency achieved by database level consolidation and automation. SQL Database Managed Instance is an expansion of the existing SQL Database resource types, combining the best of SQL Server with all the benefits of a fully-managed (platform as a service) PaaS, minimizing or eliminating the need to re-design the application.
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( June 2010) The specification defines what an 'SQL schema' is; however, databases implement it differently. To compound this confusion the functionality can overlap with that of a parent database.
An SQL schema is simply a within a database; things within this namespace are addressed using the member dot '.' This seems to be a universal among all of the implementations.A true query is exemplified as such: SELECT. FROM database.schema.tableBoth a schema and a database can be used to isolate one table, 'foo', from another like-named table 'foo'.
The following is pseudo code:. SELECT. FROM database1.foo vs. SELECT. FROM database2.foo (no explicit schema between database and table). SELECT.
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FROM database1.default.foo vs. SELECT.
FROM database1.alternate.foo (no explicit database prefix)The problem that arises is that former users will create multiple databases for one project. In this context, MySQL databases are analogous in function to PostgreSQL-schemas, insomuch as PostgreSQL lacks off-the-shelf cross-database functionality that MySQL has. Conversely, has applied more of the specification implementing cross-table, cross-schema, and then left room for future cross-database functionality.MySQL aliases schema with database behind the scenes, such that CREATE SCHEMA and CREATE DATABASE are analogs. It can therefore be said that MySQL has implemented cross-database functionality, skipped schema functionality entirely, and provided similar functionality into their implementation of a database. In summary, PostgreSQL fully supports schemas but lacks some functionality MySQL has with databases, while MySQL does not even attempt to support standard schemas.Oracle has its own spin where creating a user is synonymous with creating a schema.
Thus a database administrator can create a user called PROJECT and then create a table PROJECT.TABLE. Users can exist without schema objects, but an object is always associated with an owner (though that owner may not have privileges to connect to the database).
With the 'shared-everything' architecture, the same database can be opened by multiple servers concurrently. This is independent of replication, which can also be used, whereby the data is copied for use by different servers. In the Oracle implementation, a 'database' is a set of files which contains the data while the 'instance' is a set of processes (and memory) through which a database is accessed.Informix supports multiple databases in a server instance like MySQL.
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It supports the CREATE SCHEMA syntax as a way to group DDL statements into a single unit creating all objects created as a part of the schema as a single owner. Informix supports a database mode called ANSI mode which supports creating objects with the same name but owned by different users.PostgreSQL and some other databases have recently added support for foreign schemas, which is the ability to import schemas from other servers as defined in (published as part of ).
This appears like any other schema in the database according to the SQL specification while accessing data stored either in a different database or a different server instance. The import can be made either as an entire foreign schema or merely certain tables belonging to that foreign schema. While support for ISO/IEC 9075-9 bridges the gap between the two competing philosophies surrounding schemas, MySQL and Informix maintain an implicit association between databases while ISO/IEC 9075-9 requires that any such linkages be explicit in nature.See also. (includes market share data). some of which have relational (SQL/ODBC) interfaces.References.
Retrieved 2019-03-11. Stevens, O. (Oct–Dec 2009). Annals of the History of Computing. 31 (4): 87–91.
Retrieved 2014-07-06. (PDF)., Firebird SQL., Firebird SQL. 2019-08-01., CWI., Products, AU: Hughes. Retrieved 14 May 2019. Colgan, Maria (23 July 2018). Retrieved 3 December 2018., Oracle Corporation., Press Release, EECatalog. The PostgreSQL Global Development Group.
Retrieved 2019-08-09., PostgreSQL Community., SQLite., SQream Technologies. Citation url = publisher = PingCAP title = TiDB 3.0 Release Notes. Citation url = publisher = YugaByte title = v1.3.1 Release Notes.
AskMonty KnowledgeBase. Retrieved September 30, 2011. MariaDB Android Version by Tautvydas Andrikys. Run Apache, Mysql, Php – Web server on Android mobile or Tablet. ^. developer.polyhedra.com/history/polyhedra-8-7 Polyhedra 8.7 new headline feature: locking.
SAP SQL Anywhere Reference - Types of Lock. SAP SQL Anywhere Reference - HTTP Web Services. (like, ).
MariaDB KnowledgeBase.
Quite often someone asks me how an external SQL Server database can be accessed by an SAP system, e.g. To:. Access data in an external SQL Server database with the SAP system.
Report against data in an external SQL Server database with Business Intelligence / Business Warehouse. Use DBACockpit to monitor an external SQL Server instanceDepending on:. Which operating system your SAP application servers run on. Which purpose you want to use the connection for.
Which type of SAP application servers (ABAP, Java, Dual-stack) are available in the SAP systemThere are different connection types, technical requirements and restrictions. This blogpost clarifies the possibilities and restrictions and covers frequently asked questions:. Options and technical requirements to access an external SQL Server database.
How to setup a connection with UDConnect. How to setup a connection with DBCon / Multiconnect. How to monitor an external SQL Server Database using DBACockpit. Troubleshooting1. Options and technical requirements to access an external SQL Server DatabaseThe SAP standard ways to connect an external SQL Server instance with an SAP system are:.Multiconnect (DBCON).UDConnect (Universal Data Connect)Regardless of the way you choose you can only connect to remote databases which are reachable via network from your SAP Application Server.DBCON / MulticonnectDBCON / Multiconnect uses the Microsoft SQL Server Native Client Software (SNAC) to establish a connection to the remote SQL Server instance. The Microsoft SQL Server Client Software for Windows consists of several.dll files. For long time it was available for Windows platforms only.
Recently, Microsoft ported its ODBC SQL Native Access driver to Linux. For this reason heterogeneous Linux/Windows scenarios are now possible. DBCON utilizes the SAP ABAP stack to access the external databases so your system requires at least one ABAP-stack-based SAP Application Server running on Windows or Linux x8664.UDConnectUDConnect uses a JDBC (Java Database Connectivity) driver to establish a connection to the remote SQL Server instance. The JDBC driver consists of one or more.jar files and can be used on Windows, Unix and Linux operating systems. As UDConnect utilizes the J2EE engine of the SAP Application server to access the external databases you need to have at least one Java-Stack-based SAP Application Server in your SAP system in order to use UDConnect.Connectivity MatrixWindowsLinux x8664UnixJava StackUDConnectUDConnectUDConnectABAP StackDBConDBConnoneDual StackUDConnectDBConUDConnectUDConnectRemarks:. If your system comprises solely of ABAP stack-based servers running on Unix platforms you can neither use UDConnect nor DBCON. Because UDConnect requires at least one Java-stack based SAP Application Server (regardless of the operating system) and DBCON requires at least one Windows- or Linux x8664-based SAP Application Server.
Using DBCon on a Linux x8664 based application server can only be used to connect to SQL Server versions 2005 and higher. Predecessor releases are not supported by the Microsoft driver. Furthermore, the driver is only supported for Red Hat Enterprise Linux 5.x and higher and for Suse SLES11 SP2 and higher.2.
How to setup a connection with UDConnectUDConnect cannot be used for remote monitoring a SQL Server based system. However, you can use it to access data in an external SQL Server database.Setting up UDConnect in order to access data in an external SQL Server Database with BW/BI requires four steps:. Adding an RFC server on Java-stack side. Defining an RFC destination on BW/BI side. Installing and configuring the JDBC driver on Java-stack side. Configure the connection URL for the external database on Java-stack sideFor step-by-step instructions please see the configuration guide available under:SAP Netweaver ’04:SAP Netweaver 7.1: see attached guide (UDConnectfor710.pdf) 3.
How to setup a connection with DBCON / MulticonnectTo access data in an external SQL Server Database with DBCON / Multiconnect three steps are required:.Installing the SAP DBSL for SQL Server (dbmssslib.dll / dbmssslib.so). Creating a DBCON entry for the external databaseSAP note explains the steps required to prepare your SAP instance to connect to a remote SQL Server instance.SAP DBSL for WindowsDBCON utilizes the ABAP-stack to connect to an external database. The ABAP-stack itself requires the Database Shared Library (DBSL) to communicate with a database.
For each Relational Database Management System (RDBMS) supported by the ABAP-stack there is a separate DBSL provided by SAP. Hi BeateThats a very informative documentation around the SQL server as external data base. I have a query regarding the following set up1.
We have our ECC system(ABAP stack) installed on HP-UX2. We have SAP Process Orchestration system (JAVA only stack) on AIX3. We have MS SQL as an external database installed on WinTelGiven the above set up, my question is1. Can we connect our ECC system with MS SQL data base via DBCon or UDConnect?2. Can we connect our SAP Process Orchestration system with MS SQL data base via DBCon or UDConnect?RegardsRahul. Hi Rahul,I am wondering about these questions as I have even put it in a matrix 😉 but ok:Question 1:ECC = ABAP STACK in your case, HP-UX = Unix – no connectivityNote 1644499 also points out that the required executables for connecting to a SQL Server DB are not available for any platforms other than Windows (which is obvious) and Linux (while HP-UX is not Linux). This means if you ECC system does not include any SAP dialog instance running on a Windows Server, there is NO connectivity.You can only still connect your ECC to the SQL Server DB if you add a Windows-based SAP Application Server to this system and make sure that you only run your code connecting to this DB on this Windows Application Server.Question 2:SAP Process Orchestration is a Java stack according to you, and the platform is AIX (=UNIX).
The matrix says: UDConnect which means yes you can connect using UDConnect.Again: if you can add a Windows-based application server to your ECC system (check the SAP Product Availability Matrix for supported combinations of Windows/your product/your DB) you can have a DBCON connection to the SQL DB, if there is no supported connection or you can’t add a Windows based server for another reason you can’t.Regards,Beate. Hi Beate,Thanks a lot for this helpful post! It’s definitely very informative.I have one question thoughI have previously set up a connection from a BW to an external SQL DB using a BI Portal as the middle man (via UDConnect). Now I want to add a second SQL server to this same BW. I’ve tried copying the existing Connection Factory as well as the JavaResourceAdapter but no luck as I’m not able to start the new resources I create.Would you happen to know if that’s even possible?
If so, would you have any information you could share on adding this second source?Thanks a lot,Ricardo.