Oracle的Wnnn进程有何作用
Wnnn进程是: Space Management Worker Processes (Wnnn) populate or repopulate data on behalf of IMCO.
During population, Wnnn processes are responsible for creating IMCUs, SMUs, and IMEUs. When creating IMEUs, the worker processes perform the following tasks:
Identify virtual columns for population
Create virtual column values
Compute values for each row, transform the data into columnar format, and compress it
Register the objects with the space layer
Associate the IMEUs with their corresponding IMCUs
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