Three stone slabs were found by Romanian archaeologist Nicolae Vlassa , in the mid-20th century (1961) in Tărtăria (present-day Alba county , Transylvania ), Romania , ancient land of Dacia , inhabited by Dacians, which were a population who may have been related to the Getaes and Thracians . One of the slabs contains 4 groups of pictographs divided by lines. Some of the characters are also found in Ancient Greek , as well as in Phoenician , Etruscan , Old Italic and Iberian . The origin and the timing of the writings are disputed, because there are no precise evidence in situ , the slabs cannot be carbon dated, because of the bad treatment of the Cluj museum. There are indirect carbon dates found on a skeleton discovered near the slabs, that certifies the 5300–5500 BC period.
The checkpoint process periodically scans the buffer cache for buffers with pages from a specified database and writes all dirty pages to disk. Checkpoints save time during a later recovery by creating a point at which all dirty pages are guaranteed to have been written to disk. The user may request a checkpoint operation by using the CHECKPOINT command, or the Database Engine may generate automatic checkpoints based on the amount of log space used and time elapsed since the last checkpoint. In addition, a checkpoint is generated when certain activities occur. For example, when a data or log file is added or removed from a database, or when the instance of SQL Server is stopped. For more information, see Checkpoints and the Active Portion of the Log .