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statement must relocate the changed index entries to maintain the index order.
For that, the database must remove the old entry and add the new one at the new location.
And combined with several other settings, like an Update Options.
When no unique identifying columns are specified and no row identifying column is found, Fire DAC will switch Update Options. Setting to False will include all fields, wihch helps to reuse the same generated statement for posting all updates and minimize DBMS work to prepare the statements.
Update Mode to Note: To avoid the above issues with an SQL Server table, which also has triggers, the triggers should have SET NOCOUNT ON specified at the beginning. To disable updates to columns, exclude controls automatic refreshing of the column values, which may be changed by the DBMS after inserting or updating a record.
The columns, which may require refreshing after record inserting are as follows: Sometimes setting Update Changed Fields to False may improve the performance.
He minimizes the development time using modern SQL and optimizes the runtime with smart indexing.
His book entitled SQL Performance Explained has become standard reading.“Use The Index, Luke!