fusionieren v (mit). The company plans to merge its two subsidiaries. — Die Firma möchte ihre beiden Tochterfirmen fusionieren. Mercury merges with the sun to give you an independent attitude. The Sun (). The process is many times more fraught than merging two banks. Englisch-Deutsch-Übersetzungen für to merge im Online-Wörterbuch aus-travel.com (Deutschwörterbuch).
Englisch-Deutsch Übersetzung für "merge"merge Bedeutung, Definition merge: 1. to combine or join together, or to cause things to do this: 2. to join a line of moving traffic. Übersetzung für 'merge' im kostenlosen Englisch-Deutsch Wörterbuch von LANGENSCHEIDT – mit Beispielen, Synonymen und Aussprache. aus-travel.com | Übersetzungen für 'merge' im Englisch-Deutsch-Wörterbuch, mit echten Sprachaufnahmen, Illustrationen, Beugungsformen.
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However, performance gains depend on having correct indexes, joins, and other considerations in place. These indexes ensure that the join keys are unique and the data in the tables is sorted.
Query performance is improved because the query optimizer does not need to perform extra validation processing to locate and update duplicate rows and additional sort operations are not necessary.
To filter out rows from the source or target tables, use one of the following methods. That is, when SQL Server processes joins, the query optimizer chooses the most efficient method out of several possibilities of processing the join.
When the source and target are of similar size and the index guidelines described previously are applied to the source and target tables, a merge join operator is the most efficient query plan.
This is because both tables are scanned once and there is no need to sort the data. When the source is smaller than the target table, a nested loops operator is preferable.
We recommend that you do not use the hash join as a query hint for MERGE statements because this join type does not use indexes. This means that any literal values that are contained in the query are substituted with parameters.
This process, called simple parameterization, increases the ability of the relational engine to match new SQL statements with existing, previously-compiled execution plans.
Query performance may be improved because the frequency of query compilations and recompilations are reduced. In the MERGE statement, the TOP clause specifies the number or percentage of rows that are affected after the source table and the target table are joined, and after rows that do not qualify for an insert, update, or delete action are removed.
The TOP clause further reduces the number of joined rows to the specified value and the insert, update, or delete actions are applied to the remaining joined rows in an unordered fashion.
That is, there is no order in which the rows are distributed among the actions defined in the WHEN clauses. For example, specifying TOP 10 affects 10 rows; of these rows, 7 may be updated and 3 inserted, or 1 may be deleted, 5 updated, and 4 inserted and so on.
Dividing the operation into batches reduces the number of write operations performed per batch; however, each batch will perform a full table scan of the source and target tables.
The resulting read activity may affect the performance of the query. Incorrect results can occur. It is important to ensure that all successive batches target new rows or undesired behavior such as incorrectly inserting duplicate rows into the target table can occur.
Cela peut se produire lorsque la table source inclut une ligne que ne figurait pas dans un lot cible mais figurait dans la table cible globale. This can happen when the source table includes a row that was not in a target batch but was in the overall target table.
Because the TOP clause is only applied after these clauses are applied, each execution either inserts one genuinely unmatched row or updates one existing row.
By doing so, the entire file is processed in a single batch. Create a clustered index on the join columns in the target table. By default, the bulk operation assumes the data file is unordered.
Therefore, it is important that the source data is sorted according to the clustered index on the target table and that the ORDER hint is used to indicate the order so that the query optimizer can generate a more efficient query plan.
Hints are validated at runtime; if the data stream does not conform to the specified hints, an error is raised. These guidelines ensure that the join keys are unique and the sort order of the data in the source file matches the target table.
Query performance is improved because additional sort operations are not necessary and unnecessary data copies are not required. Merge PDF. Edit PDF.
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