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We know Windows NTFS compression on Oracle Database datafiles is a bad idea.

See here and here.

It prevents Asynchronous Random Disk I/O which can increase the risk of corruption and generally slow down the database.

However, we have some Oracle databases (11g & 12c) on Windows Server 2012 R2 servers with Windows file compression on the datafiles. How do we safely deactivated this file compression? Are there any watch-outs?

Thanks.

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    I have done it on MSSQL. Just shut down the database service and uncompress the files. – paparazzo Aug 12 '16 at 15:56
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As Paparazzi said for MSSQL, just shutdown the database and then decompress the files and startup again. If your architecture allows, you could offline a tablespace at a time and then just decompress the datafiles for that tablespace. Eventually though you will need do do the system tablespace and will need to shutdown the whole system.

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