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For queries requiring table scan agsinst of large, 100,000,000+ row tables, split the query into multiple threads based on a percentage of total table pages
WHY: Improved one off query performance against large, 100,000,000+ row tables.
WHO: My customer has transaction log tables that can record millions of transactions per day. Peaking just above 58 million per month in the last 6 months. Maintaining indexes to satisfy infrequent query request would be a waste of storage and other system resources. Records are purged that are older than 12 months and re-use deleted records is employed.
HOW: For queries that require a table scan, generate query threads based on a physical page ranges as a percentage of the total table pages. Add a System Value for Table Scan Scale, with scale being the percentage of total table pages. Default set at 10%, generates 10 separate query threads, with the results consolidated before presentation to user. The lowest value being 5%, or a maximum of 20 threads scanning the table pages to satisfy the user’s query.
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