A PeriData database is one file with the extension .PHF The associated index file with the extension .PHD is automatically created and automatically regenerated in case of loss or damage
An unlimited number of databases with any file name is possible. PeriData can open with several databases simultaneously. Examinations can be transferred from one database to another (with copy and paste).
In the LINK MODE, the EMR software defines the database path and file name with the call using the command line parameter /FILE. Each patient should get his own database file. Usually, the file name is generated from the ID (z.B. 00012345.phf). Recommended path name: ../PeriDataFiles
In the normal mode, the user creates new databases using the menu "File > New". The preliminary name is NONAME...phf. When the database is closed, the user defines the name and path. The path should be on a PC with a regular backup (server).
The simultaneous access to the same database is allowed and an important feature of PeriData. Only the workstation that opens a database at first will obtain full read and write permission. This is a Windows rule ("first come first served"). The following workstations get the title text [readonly]. And the icon is crossed-out -- To prevent a blocking of data transmission, all workstations without perimeter connection should set the option "Viewing Mode". They will open databases always in readonly mode. Only the perimeter workstation gets full write permission.
<...>.PHF: contains all data. Per examination 1280 byte.
<...>.PHD: associated index file. Generated automatically. Per examination 57 byte. The index file is needed for a quick build-up of the examination list and a quick search function. It is located in the same folder. In case of loss, it is reconstructed automatically. In case of corrupted data, it can be reconstructed on demand (Menu Extra > REPAIR).
Deleted examinations are only marked in the PHD index file in a first step. In a second step (Menu Extra > CLEANUP), the examinations are deleted in the PHF data file and the file is packed. This function is offered automatically when the database is closed. Small databases are cleaned up immediately without asking.
Maximum size: 64,000 examinations = 82 MB (PHF file). For safety reasons, it is recommended to keep the file size much smaller. The best solution is the combination with an EMR (electronical medical record) system.
The data are upwards compatible since more than 30 years. The downwards compatibility is limited. Data can always be read, but it may occur that an examination that was stored with a newer version is displayed incorrectly with an older version.