> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenverwaltung/register-datenbank.md).

# Database tab

Basic settings for the resource demand and data compression of the ACRON Database Engine

## Resource requirement <a href="#resourcenbedarf" id="resourcenbedarf"></a>

### Memory requirements

Memory allocation for data compression

The higher the memory requirement, the faster the data compression will run. The setting should be selected so that at least 20% of the memory capacity remains available during operation, so that an effective hard disk cache is operative.

### Priority

Specify the process priority of the Database Engine

If you set the priority low, you will be able to run many other tasks on the computer, but the processing speed of the Database Engine will decrease.

If you set the priority high, other tasks will run sluggishly on this computer, but the processing speed of the Database Engine will increase.

### Time resolution of database

This entry determines how precisely the time stamp of the process values is stored in milliseconds. The entry "200 milliseconds" signifies, for example, that all time stamps are rounded to 200 milliseconds. If milliseconds are not generally important for your installation, it is best to enter "1 second". Note that your hardware must also be able to generate the programmed accuracy for the process values.

## Compression levels <a href="#verdichtungsstufen" id="verdichtungsstufen"></a>

A key component of ACRON is data compression. The process data is compressed in multiple stages, enabling users to access compressed data from any time frame. This greatly increases the speed of data display, since for a diagram covering a period of one year with the 'Day' data basis only 365 values need to be displayed. For process data (such as 1 second data recording), about 31,536,000 values would have to be displayed. The display of the 365 values is thus more informative.

### Interval widths

Time interval for the respective compression level. Activation/deactivation can only be sequential.

Note

The interval is used to display the data in the Reporter.

For day reports and diagrams, the secondary or primary compression data can be applied.

The length of the week can be applied to select how many days a weekly report can cover (7 or 14 days).

The interval times are freely selectable (1, 5, 10, 15 and 30 minutes, and 1, 2, 4, 8, 12 and 24 hours), but are only available once.

### Compression parameters Day, Week, Month, Year <a href="#verdichtungsparameter" id="verdichtungsparameter"></a>

Generation of data based on the previous compression level (weekly data optional).


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