Quickly Resolve Oracle Blocking Sessions with KeepTool Hora

Updated October 2025

Why Blocking Sessions Matter

Analyzing Oracle blocking sessions is one of the most important tasks in high-concurrency database environments.
When a session keeps a lock for too long, performance can quickly deteriorate.
Other sessions start to wait, transactions slow down, and in critical cases, entire processes may come to a halt.

For this reason, it is essential to detect blocking sessions and their dependencies as quickly as possible.
With KeepTool Hora, you can do this effortlessly, thanks to its integrated visualization and diagnostic tools.

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Powerful Built-In Tools for Lock Analysis

KeepTool Hora provides a detailed overview of all sessions that are currently active in your Oracle database.
With the Session Monitor, you can easily answer key questions such as:

• Which sessions are currently connected to the database?

• Which ones have active transactions in progress?

• Which session is holding a lock?

• Which one is waiting for a resource?

• What SQL statement is each session executing?

• And from which user or client terminal does each session originate?

If blocking occurs, the Lock Wait Graph page provides a clear visual representation of all dependencies.
The root node of the graph displays the blocking session, including key details like SID, terminal, program, and user.
The child nodes represent sessions waiting for the blocked resource and show the respective lock modes.
Moreover, if any of these waiting sessions also block others, additional levels are automatically displayed.

Thanks to this graphical visualization, you can immediately identify the source of the blockage and understand how it propagates through the system.

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Drill Down to the Locked Record

A particularly powerful feature in KeepTool Hora allows you to determine exactly which data record is locked.
This detailed insight enables you to locate the cause of the blocking situation much faster and helps you resolve the issue efficiently.

Furthermore, this record-level visibility makes collaboration between DBAs, developers, and support engineers much easier,
since everyone can clearly see which data is affected and where corrective action is required.

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Terminate Blocking Sessions Safely

In urgent situations, when a blocking session interferes with important processes,
DBAs can safely terminate the blocking session directly from within KeepTool Hora.
This can be done conveniently via a toolbar button or a right-click context menu.

Once the session has been terminated, the lock is released immediately,
allowing waiting sessions to continue their work without manual intervention.

However, this option should be used with caution,
as prematurely ending a session may trigger rollbacks or partial transactions.
Still, when used responsibly, it provides a fast and effective solution for restoring normal database operation.

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Summary & Benefits

With KeepTool Hora, analyzing and resolving Oracle blocking sessions becomes much simpler, faster, and more transparent.

• You can visually identify blocking and waiting sessions in seconds.

• The Lock Wait Graph shows a clear, hierarchical dependency structure.

• You can drill down to see the exact locked record when needed.

• And with DBA privileges, you can safely terminate blocking sessions to restore performance.

Altogether, these features save valuable time, reduce system downtime, and improve overall database reliability.
KeepTool puts you back in control of your Oracle environment — efficiently and intuitively.

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Try It Yourself

If you want to make your Oracle session monitoring more efficient,
try the Session Monitor and Lock Wait Graph features in KeepTool Hora.
They provide an interactive, visual way to analyze blocking sessions and resolve lock conflicts in real time.