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New Background Processes Oracle 10g/11g

原创 Oracle 作者:shiyihai 时间:2007-11-26 18:11:39 0 删除 编辑

There are several new other background processes in 10g/11g,as following:
MMON performs various manageability-related background tasks, for example:
*Issuing alerts whenever a given metrics violates its threshold value
*Taking snapshots by spawning additional process (MMON slaves)
*Capturing statistics value for SQL objects which have been recently modified
MMNL
stands for manageability monitor light which is responsible to flush the information to the repository and performs frequent and light-weight manageability-related tasks, such as session history capture and metrics computation.

[@more@]MMAN
stands for memory manager which manage the automatic shared memory. MMAN serves as the SGA memory broker and coordinates the sizing of the memory components. It keeps track of the sizes of the components and pending resize operations.
RBAL
coordinates rebalance activity for disk groups in an Automatic Storage Management instance. It performs a global open on Automatic Storage Management disks.ORBn performs the actual rebalance data extent movements in an Automatic Storage Management instance. There can be many of these at a time, called ORB0, ORB1, and so forth.
OSMB
is present in a database instance using an Automatic Storage Management disk group. It communicates with the Automatic Storage Management instance.
VKTM
The virtual keeper of time provides wall-clock time and reference time for other sessions/processes.
FBAR
The flashback data archiver writes old row-versions of tables with 'flashback archive' enabled into flashback data archives on commit.
DIAG
The diagnosibility process (DIAG) runs oradebug commands and triggers diagnostic dumps as part of the new ADR (automatic diagnostic repository) feature, which is a replacement (and major enhancement) for the much-reviled RDA.
DIA0
detects hangs then triggers DIAG do take diagnostics.
SMCO/WnnnThe space management coordinator and slaves perform space allocation and reclamation.

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