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Don Burleson Blog 







Parallel Server V$PING contention

Oracle Tips by Burleson Consulting

The Data Warehouse Development Life Cycle

Parallelism And Oracle Data Warehousing


If you suspect that there may be data contention, there are several remedies. For example:

* If you identify a specific table as a source of contention, try increasing the freelists for the table.

* If you identify an index as the source of contention, try localizing all access to the index on a single instance.

But, how can we identify the source of contention? Oracle parallel server provides a view called V$PING to show lock conversions. We start by querying the V$PING view to see if there are any data files experiencing a high degree on lock conversions, as follows:

GROUP BY 1, 2, 3
ORDER BY 1, 2, 3;

You will receive an output that looks similar to Table 7.1.

Name               File #                  Class #                  Max (XNC)
Customer        13                    1                          556
Customer        13                    4                           32
Item                6                    1                           11
Item                3                    4                           32
Order             16                    1                       33456

Table 7.1 Querying the V$PING view.

This is an excerpt from "High Performance Data Warehousing", copyright 1997.

If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.

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