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  • Book Overview & Buying Oracle 10g/11g Data and Database Management Utilities
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Oracle 10g/11g Data and Database Management Utilities

Oracle 10g/11g Data and Database Management Utilities

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Oracle 10g/11g Data and Database Management Utilities

Oracle 10g/11g Data and Database Management Utilities

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Overview of this book

Does your database look complicated? Are you finding it difficult to interact with it? Database interaction is a part of the daily routine for all database professionals. Using Oracle Utilities the user can benefit from improved maintenance windows, optimized backups, faster data transfers, and more reliable security and in general can do more with the same time and resources.
Table of Contents (18 chapters)
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Oracle 10g/11g Data and Database Management Utilities
Credits
About the Author
About the Reviewer
Preface

Blocking sessions


When two or more different sessions compete for the same row simultaneously, Oracle will immediately raise the lock enqueue mechanism, which lets one process at a time modify the row. The lock will be released once the transaction is finished (after a commit or rollback command is issued). The first process that takes the row locks it, meanwhile the other processes will have to wait. If this wait time is visible to the user then it can be misinterpreted as a slow performance problem.

Blocking sessions are issues that should be solved at the program level, but in the mean time it is the DBA's responsibility to detect them and fix them. A blocking session may be normal during production time, this is not the real problem. Oracle is prepared to queue sessions, the real problem begins when a session hangs and leaves the other session indefinitely waiting for the row lock to be released.

Blocking sessions can easily be detected with Enterprise Manager. Besides the intermittent...

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