1882396 - How does 'alter table' command decide on using table scan or index access - SAP ASE | SAP Knowledge Base Article

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1882396 - How does 'alter table' command decide on using table scan or index access - SAP ASE

Symptom

When running 'alter table' on a number of tables, it is noted some perform better (using a table scan) than other tables (using an index scan). As the 'alter table' command is not a SQL query , for which the performance can be influenced by user hints or statistics, how does ASE decide the access method when running 'alter table' ?


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Environment

  • SAP Adaptive Server Enterprise (ASE) 12.5
  • SAP Adaptive Server Enterprise (ASE) 15.0
  • SAP Adaptive Server Enterprise (ASE) 15.5
  • SAP Adaptive Server Enterprise (ASE) 15.7

Product

SAP Adaptive Server Enterprise all versions

Keywords

alter table, optimizer,table scan , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , How To

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