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Additionally, if you know you want a certain minimum value to be used for one of the four areas, you may set that parameter in addition to setting the SGA_TARGET. The instance will use your setting as the lower bound, or the smallest size that particular area may be.

You can grant a role two kinds of privileges: object and system. The ROLE_SYS_PRIVS view lets you find out what system privileges have been given to a role. Here s the structure of the ROLE_SYS_ PRIVS view: SQL> DESC ROLE_SYS_PRIVS Name Null ------------------ --------ROLE NOT NULL PRIVILEGE NOT NULL ADMIN_OPTION SQL> Type -----------VARCHAR2(30) VARCHAR2(40) VARCHAR2(3)

Listing 23-9. Querying the ROLE_SYS_PRIVS View SQL> SELECT role, privilege FROM ROLE_SYS_PRIVS 2* WHERE role='DBA'; ROLE -----------------------------DBA DBA DBA DBA DBA DBA DBA DBA DBA DBA DBA DBA . . . 160 rows selected. SQL> PRIVILEGE --------------------AUDIT ANY DROP USER RESUMABLE ALTER USER BECOME USER CREATE ROLE CREATE TYPE CREATE USER CREATE VIEW EXECUTE ANY PROCEDURE ADVISOR GRANT ANY PRIVILEGE

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Context A process P1 needs to monitor the status of a process P2. P1 only needs to know the status of P2 at specific times, and it gets the status by issuing a request to P2. P2 does not provide any information unless requested by P1. Forces

Summary

The DBA_SYS_PRIVS view contains the privileges granted to both users and roles. The following code describes this view: SQL> DESC DBA_SYS_PRIVS Name Null Type ----------------------------------------- -------- ------------GRANTEE PRIVILEGE ADMIN_OPTION SQL> The following query shows how to use the view to get information about privileges granted to a user: SQL> SELECT * FROM DBA_SYS_PRIVS 2 WHERE grantee='OE'; GRANTEE PRIVILEGE ADM ------------------------------ ----------OE QUERY REWRITE NO OE CREATE SNAPSHOT NO OE UNLIMITED TABLESPACE NO SQL> NOT NULL VARCHAR2(30) NOT NULL VARCHAR2(40) VARCHAR2(3)

The DBA_TAB_PRIVS view shows the various table-level privileges that have been granted to users. The query in Listing 23-10 shows the grantees and the exact privileges they have on each table.

In this chapter, we took a look at the Oracle memory structure. We started at the process and session level, examining the PGA and UGA, and their relationship. We saw how the mode in which we connect to Oracle will dictate how memory is organized. A dedicated server connection implies more memory used in the server process than under a shared server connection, but that use of a shared server connection implies there will be the need for a significantly larger SGA. Then, we discussed the main structures of the SGA itself. We discovered the differences between the Shared pool and the Large pool, and looked at why we might want a Large pool to save our Shared pool. We covered the Java pool and how it is used under various conditions, and we looked at the block buffer cache and how that can be subdivided into smaller, more focused pools. Now we are ready to move on to the physical processes that make up the rest of an Oracle instance.

If P1 doesn t need status information except at specific times, it is time-consuming and wasteful for P2 to send notifications every time a status change occurs. P1 might ignore many of the notifications. If only P1 knows when status information is necessary or useful, it is natural for P1 to control when status information is exchanged.

Listing 23-10. Querying the DBA_TAB_PRIVS View SQL> 2 3 4 5 6 7* SELECT grantee, owner, table_name, privilege FROM DBA_TAB_PRIVS WHERE grantee='OE'; OWNER ---------SYS SYS HR HR HR HR HR HR HR TABLE_NAME PRIVILEGE --------------- ----------------DBMS_STATS EXECUTE DBMS_REDEFINITION EXECUTE COUNTRIES SELECT COUNTRIES REFERENCES LOCATIONS SELECT LOCATIONS REFERENCES DEPARTMENTS SELECT JOBS SELECT EMPLOYEES_INTER SELECT

Sometimes you may want to give a user privileges on just one or two columns in the table, and Oracle lets you do so when you use the GRANT command. The DBA_COL_PRIVS view provides you with the details of all users in the database who are grantees of these column-level object privileges. The following example shows how to grant column-level objects to the oe user on a table that belongs to the user hr: SQL> GRANT select, update (salary) 2 ON hr.employees 3 TO oe; Grant succeeded. SQL> The next query shows how to query the DBA_COL_PRIVS view to see which users have column privileges and on what objects: SQL> 2 3 4 5 SELECT grantee, table_name, column_name, privilege FROM dba_col_privs;

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