Storage Model
Decomposition Storage Model (Columnar)
QuasarDB is a column-oriented time series database. The time series are column oriented and can have an arbitrary number of columns, each column has an unique name.
Storage Architecture
Entries are often kept resident in a write cache so the daemon can rapidly serve a large amount of simultaneous requests. When a user adds or updates an entry on the cluster the entry’s value may not be synced to the disk immediately. However, quasardb guarantees the data is consistent at all times, even in case of hardware or software failure.
Concurrency Control
Multi-version Concurrency Control (MVCC) Two-Phase Locking (Deadlock Prevention)
If two transactions attempt to write to the same entry, the first transaction to operate on the entry wins and the other transaction is canceled. When a transaction writes to an entry, other transactions may access the previous value of the entry.
