UKOUG2020

Tuesday, November 12, 2019

nVision Bug in PeopleTools 8.55/8.56 Impacts Performance

I have recently come across an interesting bug in nVision that has a significant performance impact on nVision reports in particular and can impact the database as a whole.

Problem nVision SQL

This is an example of the problematic SQL generated by nVision.  The problem is that all of the SQL looks like this. There is never any group by clause, nor any grouping columns in the select clause in from of the SUM().
SELECT SUM(A.POSTED_BASE_AMT) 
FROM PS_LEDGER A, PSTREESELECT10 L2, PSTREESELECT10 L1 
WHERE A.LEDGER='ACTUAL' AND A.FISCAL_YEAR=2018 AND A.ACCOUNTING_PERIOD BETWEEN 1 AND 8
AND L2.SELECTOR_NUM=159077 AND A.ACCOUNT=L2.RANGE_FROM_10 
AND (A.BUSINESS_UNIT='10000') 
AND L1.SELECTOR_NUM=159075 AND A.DEPTID=L1.RANGE_FROM_10 
AND A.CURRENCY_CD='GBP' AND A.STATISTICS_CODE=' '
Each query only returns a single row, that only populates a single cell in the report, and therefore a different SQL statement is generated and executed for every cell in the report.  Therefore, more statements are parsed and executed, and more scans of the ledger indexes and look-ups of the ledger table and performed.  This consumes more CPU, more logical I/O.

Normal nVision SQL

This is how I would expect normal nVision SQL to look.  This example, although obfuscated, came from a real customer system.  Note how the query is grouped by TREE_NODE_NUM from two of the tree selector tables, so this one query now populates a block of cells.
SELECT L2.TREE_NODE_NUM,L3.TREE_NODE_NUM,SUM(A.POSTED_TOTAL_AMT) 
FROM PS_LEDGER A, PSTREESELECT05 L2, PSTREESELECT10 L3 
WHERE A.LEDGER='S_UKMGT' 
AND A.FISCAL_YEAR=2018 
AND A.ACCOUNTING_PERIOD BETWEEN 0 AND 12 
AND (A.DEPTID BETWEEN 'A0000' AND 'A8999' OR A.DEPTID BETWEEN 'B0000' AND 'B9149' 
OR A.DEPTID='B9156' OR A.DEPTID='B9158' OR A.DEPTID BETWEEN 'B9165' AND 'B9999' 
OR A.DEPTID BETWEEN 'C0000' AND 'C9999' OR A.DEPTID BETWEEN 'D0000' AND 'D9999' 
OR A.DEPTID BETWEEN 'G0000' AND 'G9999' OR A.DEPTID BETWEEN 'H0000' AND 'H9999' 
OR A.DEPTID='B9150' OR A.DEPTID=' ') 
AND L2.SELECTOR_NUM=10228 
AND A.BUSINESS_UNIT=L2.RANGE_FROM_05 
AND L3.SELECTOR_NUM=10231 
AND A.ACCOUNT=L3.RANGE_FROM_10 
AND A.CHARTFIELD1='0012345' 
AND A.CURRENCY_CD='GBP' 
GROUP BY L2.TREE_NODE_NUM,L3.TREE_NODE_NUM

The Bug

This Oracle note details an nVision bug:
"UPTO SET2A-C Fixes - Details-only nPlosion not happening for Single Chart-field nPlosion Criteria.
And also encountered a performance issue when enabled details-only nPlosion for most of the row criteria in the same layout
Issue was introduced on build 8.55.19.
Condition: When most of the row filter criteria enabled Details-only nPlosion. This is solved in 8.55.22 & 8.56.07.
UPTO SET3 Fixes - Performance issue due to the SET2A-C fixes has solved but encountered new one. Performance issue when first chart-field is same for most of the row criteria in the same layout.
Issue was introduced on builds 8.55.22 & 8.56.07.
Condition: When most of the filter criteria’s first chart-field is same. The issue is solved in 8.55.25 & 8.56.10."

In summary

  • Bug introduced in PeopleTools 8.55.19, fully resolved in 8.55.25.
  • Bug introduced in PeopleTools 8.56.07, fully resolved in 8.56.10.

2 comments :

Raistlin Majere said...

David, thank you for great information about nVision on your blog. We moved from Oracle 11G db to 12C this year when we moved to tools 8.56.15. To be honest we have had nothing but issues with nVision performance. It seems like we generate stats to fix an issue with Actuals reports, and the Budget reports go in the tank and vice versa. I wish there was an easier solution to solve the performance aspects of nVision. Especially when Oracle knows how many people are using this functionality. Any suggestions?

Surinder

David Kurtz said...

It never ceases to surprise me the range of trouble people have with nVision. The problems really do vary from customer to customer. Without specific information, I can only generalise, but please feel free to contact me directly.
I expect you have already read the series of posts on nVision performance tuning. The 12.2 defaults optimizer_adaptive_plans=TRUE and optimizer_adaptive_statistics=FALSE are generally best for PeopleSoft. If your budget data is now in PS_LEDGER rather than PS_LEDGER_BUDG then you have a much stronger case for partitioning. First range partition on the combination of FISCAL_YEAR and ACCOUNTING_PERIOD and then list sub-partition on LEDGER. Then how you tackle statistics on the tree selector tables will depend on the size and complexity of your trees, how you use them, and whether this is an engineered system or not.