SMA and LLA Guide : Overview of shared memory access and linked library access
Overview of shared memory access and linked library access
The solidDB®shared memory access (SMA) and linked library access (LLA) allow applications to link to solidDB® server directly, without the need to communicate through performance-consuming network protocols such as TCP/IP. SMA allows to link multiple applications while LLA allows to link one application.
SMA and LLA are implemented as library files that contain a complete copy of the solidDB® server in library format.
With SMA, the library that the applications link to can be seen as a driver. Before the linked application is started, the solidDB® server is started in a SMA mode, which loads the SMA driver dynamically and allocates and initializes a shared memory segment that the applications use to access the database.
▪With LLA, the application links to the LLA library and the application and server are built into a single executable program.
Your application does not have to be rewritten to use SMA or LLA. The applications communicate with the solidDB® server using ODBC or JDBC calls, or the solidDB® proprietary SA API.
The SMA and LLA servers can also handle requests from remote applications which connect to the server through communications protocols such as TCP/IP. The remote applications see the SMA or LLA server as similar to any other solidDB® server, while the local SMA and LLA applications see a faster, more precisely controllable version of the solidDB® server.
Also, similarly to network-based servers, multiple SMA and LLA servers can be run on the same node.
The solidDB® server used with SMA and LLA can be disk-based or diskless. Both in-memory tables and disk-based tables are also supported.
Configurations with SMA, LLA, and network-connection-based solidDB® server
1 In a standard solidDB® database configuration the applications and the server are separate programs.
2 In LLA configuration, LLA is a library that is linked into an application. Other applications may also communicate with the LLA server.
3 In SMA configuration, SMA is a driver library that multiple applications can link to. Other network connections based applications may also communicate with the SMA server.
