Performance Issue Encountered When Clicking On The [Status/Notes] Button. (Doc ID 3000273.1)

Last updated on JANUARY 26, 2024

Applies to:

Symptoms

1)
Performance issue encountered when:

• navigating to say the 'Classify VT Omissions' screen
• querying a term
• clicking on the [Status/Notes] button.

2)
This was only happening for a 'non-super' user.

3)
Below query was found to be problematic:

4)
Issue goes goes away when the TMS tables are analyzed using the 'Analyze Tables' job from within the TMS UI. This can be seen in the below execution plans:

• Before (click here to download execution plan)
  Here we see Actual Time (A-Time) of 2 minutes 56 seconds is being taken to access the TMS_DICT_CONTENTS table using the TMS_DICT_CONTENTS_NK4 index. Cardinality misestimate between estimated and actual can also be seen: E-Rows=26 versus A-Rows=22M!

• After (click here to download execution plan)
  Here we see Actual Time (A-Time) of 00:00:00.02 is being taken to access the TMS_DICT_CONTENTS table using the TMS_DICT_CONTENTS_UK1 index. Cardinality is estimated as 1 and actually zero rows are returned.

5)
Issue subsequently returns.

6)
Customer has a heavily skewed TMS_DICT_CONTENTS table i.e.

• 90% of the TMS_DICT_CONTENTS records (22M) are for the MedDRA dictionary
• 20M records are current (have END_TS=3MJ)

Changes

Cause

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