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When you grant privileges with the GRANT OPTION and later revoke these privileges, most DBMS brands will automatically revoke all privileges derived from the original grant. Consider again the chain of privileges in Figure 15-6, from Sam Clark, the sales vice president, to Larry Fitch, the Los Angeles office manager, and then to Sue Smith. If Sam now revokes Larry s privileges for the WESTREPS view, Sue s privilege is automatically revoked as well. The situation gets more complicated if two or more users have granted privileges and one of them later revokes the privileges. Consider Figure 15-8, a slight variation on the last example. Here, Larry receives the SELECT privilege with the GRANT OPTION from both Sam (the sales vice president) and George (the marketing vice president) and then grants privileges to Sue. This time when Sam revokes Larry s privileges, the grant of privileges from George remains. Furthermore, Sue s privileges also remain because they can be derived from George s grant.

The domain of all variable-length character strings that are legal SQL identifiers under the SQL2 standard. A value drawn from this domain is a legal table name, column name, and so forth The domain of all variable-length character strings with a length between zero and the maximum length supported by this DBMS. A value drawn from this domain is a legal character string. The domain of all non-negative numbers, from zero up to the maximum number represented by an INTEGER for this DBMS. A value drawn from this is zero or a legal positive number.

Part IV:

Table 16-15.

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However, consider another variation on the chain of privileges, with the events slightly rearranged, as shown in Figure 15-9. Here, Larry receives the privilege with the GRANT OPTION from Sam, grants the privilege to Sue, and then receives the grant, with the GRANT OPTION, from George. This time when Sam revokes Larry s privileges, the results are slightly different, and they may vary from one DBMS to another. As in Figure 15-8, Larry retains the SELECT privilege on the WESTREPS view because the grant from George is still intact. But in a DB2 or SQL/DS database, Sue automatically loses her SELECT privilege on the table. Why Because the grant from Larry to Sue was clearly derived from the grant from Sam to Larry, which has just been revoked. It could not have been derived from George s grant to Larry because that grant had not yet taken place when the grant from Larry to Sue was made. In a different brand of DBMS, Sue s privileges might remain intact because the grant from George to Larry remains intact. Thus, the time sequence of GRANT and REVOKE statements, rather than just the privileges themselves, can determine how far the effects of a REVOKE statement will cascade. Granting and revoking privileges with the GRANT OPTION must be handled very carefully, to ensure that the results are those you intend. Another consideration is the processing overhead required to handle the cascading revokes. If the GRANT OPTION is overused, revokes of privileges can cause significant performance problems.

16:

The SQL1 standard specified the GRANT statement as part of the SQL Data Definition Language (DDL). Recall from 13 that the SQL1 standard treated the DDL as a separate, static definition of a database and did not require that the DBMS permit dynamic changes to database structure. This approach applies to database security as well. Under the SQL1 standard, accessibility to tables and views in the database is determined by a series of GRANT

As with the DELETE statement, subqueries can play an important role in the UPDATE statement because they let you select rows to update based on information contained in other tables. Here are several examples of UPDATE statements that use subqueries: Raise by $5,000 the credit limit of any customer who has placed an order for more than $25,000.

The system catalog is a reflection of the capabilities and features of the DBMS that uses it. Because of the many SQL extensions and additional features offered by popular DBMS products, their system catalogs always contain several tables unique to the DBMS. Here are just a few examples: I DB2 and Oracle support aliases and synonyms (alternate names for tables). DB2 stores alias information with other table information in the SYSCAT.TABLES system table. Oracle makes synonym information available through its USER_SYNONYMS system view. I SQL Server supports multiple named databases. It has a system table called SYSDATABASES that identifies the databases managed by a single server. I Many DBMS brands now support stored procedures, and the catalog contains one or more tables that describes them. Sybase stores information about stored procedures in its SYSPROCEDURES system table. I Ingres supports tables that are distributed across several disk volumes. Its IIMULTI_LOCATIONS system table keeps track of the locations of multivolume tables.

15:

Summary

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