Large Datafile Sizes with Oracle 10g on ECC 6.0 SR3

We installed ECC 6.0 SR3 on Oracle 10.2.0.2 and are wondering if the space usage is normal. We've allocated 125 GB for the partition, and the datafiles have the following sizes:
Sapdata1: 30.5 GB
Sapdata2: 26.2 GB
Sapdata3: 31.5 GB
Sapdata4: 28.6 GB
This leaves us with 7GB of free space on the database drive. 116GB of used space for the datafiles of a brand new SAP installation does not seem right. It doesnu2019t seem normal to me, coming from a MS SQL Server background where around 75 GB is sufficient.
Any feedback or assistance will be greatly appreciated....

> We installed ECC 6.0 SR3 on Oracle 10.2.0.2 and are wondering if the space usage is normal. We've allocated 125 GB for the partition, and the datafiles have the following sizes:
>
> Sapdata1: 30.5 GB
> Sapdata2: 26.2 GB
> Sapdata3: 31.5 GB
> Sapdata4: 28.6 GB
> This leaves us with 7GB of free space on the database drive. 116GB of used space for the datafiles of a brand new SAP installation does not seem right. It doesnu2019t seem normal to me, coming from a MS SQL Server background where around 75 GB is sufficient.
Oracle doesn't use the datafiles the same way SQL server does. If you e. g. drop a table from the database, the spaces is still occupied whereas on SQL server the allocated spaces is getting decreased automatically.
Oracle uses "Extents" to expand the space a table consumes, the size of that extent may be much more than actually necessary.
Those 116 GB are not filled completely, they are allocated on the filesystem.
Markus

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