Sybase 12.4.2 - Manual (Page 415)

CHAPTER 11 Backup and Data Recovery
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Figure 11-1: sp_iqcheckdb results
Concurrency issues for sp_iqcheckdb
When you run sp_iqcheckdb , it reads every database page in use. This
procedure consumes most of the database server’s time, so that the I/O is as
efficient as possible. Any other concurrent activities on the system will run