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Printing Denso QR Bar Code in C#.NET An Introduction to Microsoft SQL Server Manageability Features

An Introduction to Microsoft SQL Server Manageability Features
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Querying for Changes
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You use either the cdc.fn_cdc_get_all_changes_<capture_instance> or the cdc.fn_cdc_get_net_ changes_<capture_instance> function to query data in the change table. If you enable CDC and set the supports_net_changes argument to 1, both functions are available for the CDC instance defined. If you set the supports_net_changes argument to 0, or if you do not include the argument, only the cdc.fn_cdc_get_all_changes_<capture_instance> is available. With net changes enabled, if you want to write a query that returns one row in the result set for each changed row in the Log Sequence Number (LSN) range and includes only the final content, even if intermediate changes have occurred, you should use the cdc.fn_cdc_get_ net_changes_<capture_instance> function. The cdc.fn_cdc_get_net_changes_<capture_instance> function includes the following arguments:
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Defines the starting LSN number to create the range within which rows should be returned. All rows in the change table with an LSN value equal to or greater than the from_lsn value are included in the result set. This is referred to as setting the lower bound of the query range.
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Defines the ending LSN number to create the range of rows returned. All rows in the change table with an LSN value less than or equal to the from_lsn value are included in the result set. This is referred to as setting the upper bound of the query range.
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to_lsn row_filter Controls which rows are returned and what is displayed in the metadata columns of the result set. The row_filter argument can have any of the following values:
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All Returns the LSN number of the transaction in the _$start_lsn column, the value of the operation performed in the _$operation column, and NULL in the _$update_ mask column. All with mask Returns the LSN number of the transaction in the _$start_lsn column, and the value of the operation performed in the _$operation column. If the UPDATE operation returns a value of 4, the bits in the _$update_mask column associated with the updated columns are set to 1. All with merge Returns the LSN number of the transaction in the _$start_lsn column, and returns a value of 1 in the _$operation column if the row was deleted and a value of 5 if an INSERT or UPDATE needs to be used to apply the change. The _$update_mask always has a value of NULL.
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This option is designed to improve performance when you don t need to distinguish between INSERT and UPDATE statements. You should consider using this option if you are also using the MERGE operation available in SQL Server 2008.
Lesson 3: Tracking Data Changes
More info
MERGE cOMManD
For more information about the MERGE command, see Lesson 2 of 2, Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements, in this book.
The table returned when you query the cdc.fn_cdc_get_net_changes_<capture_instance> function includes the following columns:
_start_lsn
Displays the LSN associated with the commit transaction action of the
change.
Displays the sequence value to order the row changes that occur within a transaction. All rows in a transaction have the same _$start_lsn value.
_$seqval _$operation Displays an integer value based on the operation performed and the row_filter_option parameter. When you set the row_filter_option to all or all with mask, this column displays the following values:
1 for DELETE operations 2 for INSERT operations 4 for UPDATE operations
When the row_filter_option parameter is set to all with merge, the _$operation column displays the following values: 1 for DELETE operations 5 for both INSERT and UPDATE operations
Displays a bit mask representing the columns that are being captured from the source table. A 1 in the mask represents a column that was changed. For INSERT and DELETE statements, all bits are set to 1.
_$update_mask <captured source table columns>
Returns each column from the source table that
was captured. The following query modifies rows in the FactInternetSales table. Figure 9-22 shows the result set of the cdc.fn_cdc_get_net_changes_InternetSales function once the updates have been executed:
USE AdventureWorksDW2008; GO DECLARE @begin_time datetime, @end_time datetime, @from_lsn binary(10) , @to_lsn binary(10); -- Set the beginning of the time interval to yesterday to capture all changes. SET @begin_time = GETDATE() -1; -- DML statements to produce changes.
UPDATE dbo.FactInternetSales SET OrderQuantity = 5 WHERE SalesOrderNumber = 'SO43697' AND SalesOrderLineNumber = 1;
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