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Emmanuel Bernard commented on HHH-2448:
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Not at the moment. It would be great to have someone of the community step up on that
one.
Generate identical column aliases among cluster
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Key: HHH-2448
URL:
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2448
Project: Hibernate3
Issue Type: Improvement
Components: query-criteria, query-hql
Affects Versions: 3.2.2
Environment: Hibernate version: 3.2.2, 2.1.8
Database: Oracle 9.2.0.8
Reporter: Loïc LEFEVRE
Attachments: report_1.txt, report_2.txt
Among our weblogic cluster (12 instances), we can see that a query can have different
column aliases.
Although all seems correct, when regarding database reports like StatsPack or Spotlight
we can see that because of these different aliases, the reports are wrong. Indeed, a
resource consuming query can see its associated report properties (cpu usage, buffer gets,
number of executions...) divided by the number of weblogic instances of our cluster (i.e.
divided by 12) thus preventing us to pinpoint the queries to look at.
On a 3 instances cluster, we can see this report:
REPORT#1: one statement with a poor number of buffer gets/execution is reported splitted
in 3, see the alias generated for column DTO.CREATION_DATE
for example
On a 4 instances cluster, we can see this report:
REPORT#2: one statement responsible of the latch free/cache buffers chains wait events
splitted in 4, note the column alias generated fordeffcashcy0_.BEST_EXPECTED_CY
More than confusing the DBAs about the same query with n different "faces", our
reports don't show us all the queries to look at: indeed, in our "Top 50
queries", a lot of them are duplicates! Also the memory required in the SGA to store
the queries, the execution plan and so on is increased...
Finally, although the column aliases can have up to 30 characters under Oracle, the limit
is set to 10, why?
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