- SCN blog Effective usage of sampling for update statistics in ASE says:
- if a column appears in multiple indexes, the update index statistics table_name [index_name] command updates statistics for that column multiple times.
- the sampling can be used on non-leading columns only.
- in some cases, it may just take too much time and resources.
- e.g. We have two indexes;
Index 1 : IX_TRANSACTIONS_SBAC_ID_SEC_ID( SUBACCOUNT_ID, SECURITY_ID)
Index 2 : IX_TRANSACTIONS_SEC_ID_SBAC_ID (SECURITY_ID, SUBACCOUNT_ID)
- If we run update index statistics on Index 1 and the same column list is present on Index2 , then will Index2 use the same statistics OR will it require its own statistics?
SAP Adaptive Server Enterprise (ASE) 15.7 and 16.0
leading, nonleading, print_progress , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , How To
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