Oracle 10g 关于控制文件的等待事件

Oracle 10.2

control file parallel write

This event occurs while the session is writing physical blocks to all control files. This happens when:

• The session starts a control file transaction (to make sure that the control files are up to date in case the session crashes before committing the control file transaction)

• The session commits a transaction to a control file

• Changing a generic entry in the control file, the new value is being written to all control files

control file sequential read

Reading from the control file. This happens in many cases. For example, while:

• Making a backup of the control files

• Sharing information (between instances) from the control file

• Reading other blocks from the control files

• Reading the header block

Wait Time: The wait time is the elapsed time of the read