Performance Aspects of Shadowing
In multi-user systems, performance is not noticeably affected by shadowing, even though the shadowing system needs more machine resources because more files need to be updated.
Applications do not have to wait for the shadows to be updated as this is done in the background. Actually, all updates to the disk, even to master databanks, are performed by background processes (except for updates to
TRANSDBand its shadows).
In single-user systems, no background process is used. This means that an application has to wait for the shadows to be updated.
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