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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.

CREATE SNAPSHOT PRODPRICE REFRESH COMPLETE START WITH SYSDATE NEXT SYSDATE+7 AS SELECT MFR_ID, PRODUCT_ID, PRICE FROM PRODUCTS@REMOTE_LINK

NULL | NOT NULL constraint As discussed earlier in this chapter, a speci cation of NULL allows null values in a column, while a speci cation of NOT NULL prohibits null values in the column. Be careful of defaults. If you omit this clause in a Microsoft SQL Server or Sybase database, NOT NULL will be assumed by the DBMS, but if you omit the clause in most other DBMSs, such as Oracle, DB2, MySQL, and PostgreSQL, the behavior is just the opposite: NULL will be assumed. A NOT NULL constraint can also be written as a CHECK constraint (as shown next) that speci es a condition of IS NOT NULL. Here is the SQL syntax and some examples:

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.

CREATE SNAPSHOT PRODPRICE REFRESH FAST START WITH SYSDATE NEXT SYSDATE+1 AS SELECT MFR_ID, PRODUCT_ID, PRICE FROM PRODUCTS@REMOTE_LINK

How do the two graphs differ Well, it can be seen that in the parallel plots, the voltage remains the same throughout, and it is the current that changes contrast this to the series experiment where it was the voltage that changed.

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.

23:

CHECK Constraint A check constraint can be used to enforce any business rule that can be applied to a single column of a table. The condition included in the constraint must always be true whenever the column data in the table is changed or the DBMS rejects the change and displays an error message. An important restriction is that the condition in a column constraint cannot reference any other column. Note in the CUSTOMER_ACCOUNT table example that there are three columns (CUSTOMER_HOLD_INDIC, CREDIT_CARD_ON_FILE_INDIC, and CHILD_RENTAL_ALLOWED_INDIC) that have a CHECK constraint that allows only the values Y and N in the column data. Column constraints may be given an optional name following the CONSTRAINT keyword, which is a good practice because constraint names usually appear in any error message displayed when the constraint is violated. Here is the syntax of a CHECK constraint and an example: