This topic describes the internal architecture of PolarDB for PostgreSQL(Compatible with Oracle).
Architecture component | Description |
---|---|
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. |