Exadata MAA Best Practices Series Using DBFS on Exadata (Use Cases and Performance Expectations)

Introduction and Brief Architectural Overview

• Oracle Database File System (DBFS) is a generic Oracle Database 11g feature
• On the Exadata Database Machine, DBFS can be a mounted file system suitable for many use cases
• Mounted DBFS is a distributed file system
  • Not a cluster file system
  • More akin to NFS or CIFS
  • No cluster membership necessary to mount

DBFS – Architecture Overview

• FUSE (File system in UserSpacE)
  • An API and Kernel modules used to implement file systems in user space.
• DBFS is a file system interface for SecureFiles
  • DBFS Content Repository implements a file server
  • PL/SQL package implements file calls
  • File create, open, read, list, etc.
  • Files are stored as SecureFile LOBs
  • Directories and file metadata stored in tables/indexes

kevin.jernigan@oracle.com has told me that While the information was correct at the time the slides were created, it is no longer accurate.

So I would like to remove the old slide, and now they are in the midst of running benchmark tests on DBFS to demonstrate its performance and scalability characteristics with large numbers of files.

They provide a new DBFS benchmark results as below one,These results are focused on sustained throughput with various file sizes and workloads, and we can see that DBFS can deliver very high throughput for a wide range.

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