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    Type:Sub-task 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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    Component/s: None
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    None
Problem
We don't have foreign keys on history tables, so there is no automatic indexing. However, we use the columns ACT_HI_PROCINST(PROC_INST_ID_) and ACT_HI_VARINST(ACT_INST_ID_) for the export queries. To avoid slow queries, let's add indices.
Acceptance Criteria
- Add the following indicex: ACT_HI_VARINST(ACT_INST_ID_)
- An index on ACT_HI_PROCINST(PROC_INST_ID_) is not needed since it has a unique key constraint