Oracle Database - Input/Output (I/O)

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How to handle excessive I/O waits?

There are several ways to handle excessive I/O waits. In the order of effectiveness, these are as follows:

  • Reduce the I/O activity by SQL tuning
  • Reduce the need to do I/O by managing the workload (in the time)
  • Gather system statistics with DBMS_STATS package, allowing the query optimizer to accurately cost possible access paths that use full scans
  • Add more disks to reduce the number of I/Os for each disk
  • Alleviate I/O hot spots by redistributing I/O across existing disks

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