# Miscellaneous {% hint style="warning" %} **This is the manual for older MicroStream versions (Version < 5.0).** **The new documentation (Version >= 5.0) is located at:** [https://docs.microstream.one/](https://docs.microstream.one/manual) {% endhint %} ## **Are transactions possible in MicroStream?** Yes. In fact, every storing of data is executed as a transaction, an atomic all-or-nothing action. When one or more entities are stored, their data is collected into a continuous block of bytes and that block is written to the physical form (the "files") in one fell swoop. Any problem during the IO-operation causes the whole block to be deleted (rolled back). ## **Is MicroStream multi-threaded?** Yes. The storing and loading process can be parallelized by using multiple threads and thus be strongly accelerated. There is no limitation on how many threads can be used, apart from the mathematical constraint that the thread count must be a power of 2 (1, 2, 4, 8, 16, etc.). ## **Does MicroStream support a backup strategy?** Yes. There are currently two options available to create backups: An on-the-fly backup that copies and validates stored entity data after it has been written and the possibility to export all database files to a target location (which is in fact just a low-level file copying, but executed in a concurrency-safe way). ## **Does MicroStream provide data export/import functionality?** Yes. MicroStream provides a per-type export of binary data and a utility to convert its binary data into the CSV format. The other way around (convert CSV to binary an import binary files) is also possible. ## **Does MicroStream provide a user management, authentication and authorization etc., like conventional DBMS ?** No, because it doesn't need to. Such concerns are long covered by the application itself, with the DBMS usually being degraded to only being the application's exclusive database. Thus, all that is needed for a modern business application is just an application-exclusive data storage solution, which is exactely what MicroStream is. ## **Is it possible to migrate an existing database to MicroStream?** Yes, if the data is structured in a format conforming to the entity classes and with references being represented in globally unique and bijective numbers. How hard that is for a given database depends on its specifics, but it can be as easy as executing one generically created SELECT per table. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://manual.docs.microstream.one/2.2/data-store/faq/miscellaneous.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.