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Several DBMS vendors have moved beyond their extract and load utility programs to offer support for table extraction within the DBMS itself. Oracle, for example, offers a snapshot facility to automatically create a local copy of a remote table. In its simplest form, the local table is a read-only replica of the remote master table, which is automatically refreshed by the Oracle DBMS periodically. Here is an Oracle SQL statement to create a local copy of product pricing data, assuming that the remote master database includes a PRODUCTS table like the one in the sample database: Create a local replica of pricing information from the remote PRODUCTS table.
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CREATE SNAPSHOT PRODPRICE AS SELECT MFR_ID, PRODUCT_ID, PRICE FROM PRODUCTS@REMOTE_LINK
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This statement effectively creates a local Oracle table named PRODPRICE. It contains three columns, specified by the SELECT statement against the remote (master) database. The at sign and name REMOTE_LINK in the statement tell Oracle that the
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PRODUCTS table from which the data is to be replicated is a remote table, accessible via the Oracle database link named REMOTE_LINK. The Oracle database administrator sets up these remote database links as part of the distributed Oracle capabilities that are required to use the snapshot feature. Finally, the CREATE SNAPSHOT statement will actually cause the local PRODPRICE snapshot table to be populated with data from the remote PRODUCTS table. With this type of read-only snapshot, users are not allowed to change the snapshot table with INSERT, UPDATE, or DELETE statements. All database updates occur in the master (remote) table and are propagated to the replicated (snapshot) table by Oracle. The database administrator can manually refresh the snapshot table as desired. The CREATE SNAPSHOT statement also includes rather comprehensive facilities for specifying automatic refreshes. Here are some examples: Create a local replica of pricing information from the remote PRODUCTS table. Refresh the data once per week, with a complete reload of the data.
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CREATE SNAPSHOT PRODPRICE REFRESH COMPLETE START WITH SYSDATE NEXT SYSDATE+7 AS SELECT MFR_ID, PRODUCT_ID, PRICE FROM PRODUCTS@REMOTE_LINK
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Create a local replica of pricing information from the remote PRODUCTS table. Refresh the data once per day, sending only changes from the master table.
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CREATE SNAPSHOT PRODPRICE REFRESH FAST START WITH SYSDATE NEXT SYSDATE+1 AS SELECT MFR_ID, PRODUCT_ID, PRICE FROM PRODUCTS@REMOTE_LINK
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In the latter example, the snapshot is refreshed by transmitting only changes from the remote PRODUCTS table. Oracle implements this capability by maintaining a log of changes (a snapshot log) on the remote system and updating the log every time an update to the PRODUCTS table would affect the snapshot replica. When the time for a refresh arrives, information from the snapshot log is used. For applications like this one, where product price changes probably affect only a small percentage of the overall table, this strategy is effective. The additional overhead of maintaining the log for the master table is more than offset by the reduced network traffic of transmitting only changed data. In other applications, where a large percentage of the rows in the master table will be modified between refreshes, it may be more efficient to simply do a complete refresh and eliminate the overhead of maintaining the snapshot log. By default, Oracle identifies rows (to determine whether they are changed) based on their primary key. If the primary key is not part of the replicated data, this can cause confusion about which rows have been updated; in this case, Oracle uses an internal row-id number to identify the modified rows for refreshes to the snapshot.
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The SELECT statement that defines the snapshot table offers a very general capability for data extraction. It can include a SELECT clause to extract only selected rows of the master table: Create a local replica of pricing information for high-priced products from the remote PRODUCTS table. Refresh the data once per day, sending only changes from the master table.
CREATE SNAPSHOT PRODPRICE REFRESH FAST START WITH SYSDATE NEXT SYSDATE+1 AS SELECT MFR_ID, PRODUCT_ID, PRICE FROM PRODUCTS@REMOTE_LINK WHERE PRICE > 1000.00
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