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Once a partitioned table is defined using a partition scheme and function, data can be added and removed from the partitioned table, one partition at a time. A single table can be loaded with external data and then swapped with an empty table partition, using what s called a SWITCH operation, something done by ALTERing the table. Next, by manipulating the table s partition function, two partitions in a table can be combined (using the MERGE option) to form one single new partition, and a single partition can be SPLIT into two partitions. The end result is that you can use the SWITCH, MERGE, and SPLIT operations to modify a partitioned table so as to load new data and remove old data. For example, to load new data into a partitioned table, follow these steps:

Load the new data into a staging table in the same database. Use SPLIT to create an empty new partition at the front end of the table (where you want to load the data). Swap the staging table with the empty partition, using the SWITCH operation.

Use either an icon editor such as the Icon Composer tool included in the Apple Developer Tools or the IconBuilder plug-in for Adobe Photoshop, Adobe Photoshop Elements, or Macromedia Fireworks Some other applications can also create Apple icon image files Make the file 512 pixels high by 512 pixels wide and 72 dpi resolution Use RGB color rather than CMYK color If the icon occupies only part of the square (as most icons do), apply alpha to make the empty parts see-through so that the dialog box s background can appear through them Now save your script as a script bundle and add the icon file to it Follow these steps:

be set so certain standard tone pitches result (such as 2125 Hz and 2295 Hz in the case of 170-Hz shift) Unlike the situation with CW reception, there is little tolerance for BFO adjustment variation or error

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:

1 2 3

Bundle Contents drawer at the side of the window (usually on the right, unless AppleScript Editor is too near the right edge of your Mac s screen)

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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.

Bundle Contents drawer (see Figure 8-10)

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.