barcode 128 font c# Figure 2 An initially empty partition is swapped with a full staging table. in C#

Create ANSI/AIM Code 128 in C# Figure 2 An initially empty partition is swapped with a full staging table.

Figure 2 An initially empty partition is swapped with a full staging table.
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Figure 2 shows the loading operation.
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How the partition function works
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In figure 2, partition 3 is initially empty and a staging table S is created and loaded with data. Then S is swapped with partition 3 using the SWITCH operation. The result is that partition 3 has the data and the staging table is now empty. This operation involves metadata only, and only takes milliseconds to complete, no matter what the size of the new table. Because there s no data transfer, no activity other than the metadata operation is logged in the transaction log. This is how table partitioning can load data quickly. Although the metadata operations (SWTICH, MERGE, and SPLIT) occur almost instantaneously, to accomplish them SQL Server requires a schema modification lock on the partitioned table. If other transactions are running that prevent the schema modification lock, the metadata operations will be blocked until the required lock is granted. To remove old data from a partitioned table, follow these steps:
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Create an empty staging table in the same database. Swap the staging table with the oldest full partition, using the SWITCH operation. MERGE the old empty partition with an empty neighbor to remove it.
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Figure 3 illustrates how data can be removed. In figure 3, partition 1 has data and an empty staging table S is created. Then S is swapped with partition 1 using the SWITCH operation, resulting in an empty partition 1 but a full staging table S. As before, this operation involves metadata only, and only takes milliseconds to complete. Once the data has been swapped out to staging table S, partition 1 can be merged with partition 2 or another empty partition, and effectively disappear. Then the staging table data can optionally be copied out of the database for archiving, and the table truncated and reused later. This is how table partitioning can remove data quickly from a partitioned table.
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Figure 3 A full partition can be swapped with an empty staging table to remove data.
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How the partition function works
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So how does this all work As figure 1 showed, it all starts with the partition function. This is a special type of function used in table partitioning, and is unlike other T-SQL functions in several ways. Like other functions, each partition function is scoped to the database it s created in. Although the partition function is a user-created database object, it s not visible by ordinary means in Management Studio; you can find partition functions, along with partition schemes, in the Storage node for each database. The reason is because the partition function is a special database object, not found in the sys.sysobjects table like other user-created and system functions.
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Some practical issues in table partitioning
What a partition function does is define the boundaries of a partitioned table based on the data type of the partitioning key of the table. The partition function splits up the range of all possible values that might be in the partitioning key of a table, and assigns each to a possible partition. It s important to see that the partition function operates in a flexible way that can change over time. This is critical: you use the SPLIT and MERGE operations to add and remove partitions in a table by adding and removing partitions in the table s partition function. For example, you can create a partition function using the following syntax:
CREATE PARTITION FUNCTION PFNExample1_Left (int) AS RANGE LEFT FOR VALUES (10, 20, 30);
This code creates a partition function that Has a boundary range with data type integer Sets the range type to LEFT Sets the integer values 10, 20, and 30 as the initial boundary values Creates a total of four possible partitions It s important to see that three boundary values results in four partitions. The boundary values are the points in the range of possible values where the cuts into partitions are. There s always one more partition than there are boundary values.
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