This topic describes the internal architecture of PolarDB-O.
|shared_buffer_pool||The shared buffer, which is used to buffer data for fast data processing.|
|wal buffer||The log buffer. Write-ahead logging (WAL) logs must be written to the log buffer first, and then flushed to disks after the log size reaches the threshold or the commit operation is triggered.|
|clog buffer||The buffer for storing the commit log (clog). The clog is used to record the transaction commit status. You can determine the transaction visibility based on the clog.|
|local storage||The local storage.|