![]() ![]() They are not, however, completely fail-safe. DBISAM offers transaction support in the form of buffered, serialized transactions that allow tables to survive unexpected client workstation power-downs with little, or in most cases, no data corruption. Record locking can be configured to be pessmistic (default) or optimistic. Automatic record locking and manual table locking is provided in DBISAM. It uses a LRU cache management algorithm that also includes intelligent read-ahead buffering, optimized, serialized writes, and support for read-only devices like CD-ROMs with optimized buffering. These figures can be adjusted in the engine to allow for more memory consumption, if so desired. DBISAM does not pre-allocate large blocks of memory and uses, by default, a very small 128k of memory for each physical table in a session that contains BLOB fields and 96k for each physical table in a session that does not contain BLOB fields - 32k for records, 64k for indexes, and 32k for BLOBs (if present). ![]() Engine Features DBISAM can be used as a single-user, multi-user, or client-server engine. BDE aliases as well as normal directories are supported as the source for transfers, making it easy to transfer an entire database with little or no effort. BDE Database Transfer Utility This utility allows the developer or end user to transfer any BDE-accessible table(s) to DBISAM format with a few clicks of the mouse. All functions are subject to having administrator rights on the database server being administered and access can be controlled on a per-user basis. This utility can modify server configuration data, users, databases, and user rights as well as retrieve server log information. Server Administration Utility This utility allows the developer or end user to administer a DBISAM database server from a convenient and easy-to-use interface. Utility Description Database System Utility This utility allows the developer or end user to create, browse, update, restructure, search, query, and print DBISAM tables from a convenient and easy-to-use interface. The complete source code for all utilities provided, and source code for DBISAM itself is available for an additional charge. The DBISAM ODBC Driver contains an easy-to-use configuration wizard for creating and modifying user and system data sources, and also supports direct driver connections using a. It can be used with Visual Studio using the ODBCDirect access layer, and with Visual Studio.NET or higher with the ODBC.NET Data Provider. Overview The DBISAM ODBC Driver is contained within a single DLL with no external libraries required. ![]()
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