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Access table updating time stamp

This is more efficient than verifying that all the other columns still have the same values they had when the dynaset was last refreshed. For views, you can recreate the link and select one or more columns in the dialog box that appears after you select the view. In addition, you must contend with the fact that, unlike the Access database engine, the SQL Server database engine assumes that a single update statement can only modify columns in a single table. It is not necessary to create an index for the view on the server. Supporting concurrency checks Probably the leading cause of updatability problems in Access linked tables is that Access is unable to verify whether data on the server matches what was last retrieved by the dynaset being updated. To diagnose and fix these problems, you need to understand the capabilities that Access relies on when performing updates. If the link is to a table, you can also create a new unique index on the server and recreate the link. There are several types of data that Access is unable to check reliably for matching values.

Access table updating time stamp


Note that data types that cause updatability problems can also cause problems when included in keysets. If Access fails to find a matching value on the server, it assumes that the row has been deleted. To diagnose and fix these problems, you need to understand the capabilities that Access relies on when performing updates. A quick and easy way to remedy these problems is to add a timestamp column to the table on SQL Server. There are several types of data that Access is unable to check reliably for matching values. These include large object types such as text, ntext, image, and the varchar max , nvarchar max , and varbinary max types introduced in SQL Server This is more efficient than verifying that all the other columns still have the same values they had when the dynaset was last refreshed. The Access database engine has a different set of rules affecting what types of queries can be updatable. This term is supported in SQL Server. It is not necessary to create an index for the view on the server. If the link is to a table, you can also create a new unique index on the server and recreate the link. You should see the familiar primary key icon to the left of a column or set of columns in the table. Access also has trouble updating tables containing bit columns that do not have a default value and that contain null values. For views, you can recreate the link and select one or more columns in the dialog box that appears after you select the view. In addition, you must contend with the fact that, unlike the Access database engine, the SQL Server database engine assumes that a single update statement can only modify columns in a single table. You also may encounter updatability issues with linked SQL Server views. Supporting concurrency checks Probably the leading cause of updatability problems in Access linked tables is that Access is unable to verify whether data on the server matches what was last retrieved by the dynaset being updated. Access needs a set of unique keys for any rows being updated. The ANSI standard term for this type of column is rowversion. Specifying a unique index If you find that a linked table or view is not updatable, see if the link has been assigned a unique index in Access. If Access cannot perform this verification, it assumes that the server row has been modified or deleted by another user and it aborts the update. In Adjusting Dynaset Behavior earlier in this paper, you learned how Access selects this index and how you can execute SQL statements in Access to designate a unique index. The data in a timestamp column is completely unrelated to the date or time. When choosing unique identifiers, pick columns with values that can be matched reliably. Instead, it is a binary value that is guaranteed to be unique across the database and to increase automatically every time a new value is assigned to any column in the table.

Access table updating time stamp


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