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Is my general understanding that a typical database management systems bypass file system correct? I understand that they manage their own space on disk and they write actual data and index systems like B tree directly into disk blocks bypassing any intermediate help from file system.
This assumes that root would provide the database user permission to directly read and write from disk blocks. In Linux, this is still easier as disk can be treated as a file.
Any pointer to real case studies will be greatly appreciated.
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Data sharing: The file system does not allow sharing of data or sharing is too complex. Whereas in DBMS, data can be shared easily due to a centralized system. Data concurrency: Concurrent access to data means more than one user is accessing the same data at the same time.
While a file system stores unstructured, often unrelated files, a DBMS is used to store and manage structured, related data. A DBMS creates and defines the restraints for a database. A file system allows access to single files at a time and addresses each file individually.
Database Management Systems (DBMS) are software systems used to store, retrieve, and run queries on data. A DBMS serves as an interface between an end-user and a database, allowing users to create, read, update, and delete data in the database.
File System Vs DBMS: Explore What is the Difference between File System and DBMS. File System helps to store a collection of raw files of data into a hard disk, while DBMS is a software system, and it helps to store, manipulate or recover data.
Most rely on the underlying file system for WAL etc: basically they outsource it to the OS.
Some DBMS support (Oracle, MySQL) "raw" partitions, but it isn't typical. Too much hassle (see this chat about Postgres) because you still need WAL etc on your raw partition.
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