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7 C The CONNECT_DATA that specifies a SID or service is missing A, B, D, and E A is wrong because L1 is the connect string, not an instance or service name B is wrong because dynamic registration is not enough to compensate for a missing CONNECT_DATA clause D is wrong because the use of IPC to bypass the listener is not relevant E is wrong because (while certainly true) it is not the main problem 8 C Stack space is not part of the UGA and therefore does not go into the SGA A and B These are UGA components and therefore do go into the SGA 9 a B, b E, c F, d A, e D, f C These are the correct mappings of objects to functions 10 A and D Dispatchers maintain the connection to user processes, place requests on the common queue, and retrieve result sets from response queues B, C, and E B is wrong because each dispatcher has its own response queue C is wrong because it is the listener that load-balances, not the dispatchers E is wrong because the connections to a dispatcher are persistent: if it dies, they will be broken 11 D To prevent queueing on the common queue, Oracle will launch additional shared servers but only up to the max_shared_servers value A, B, and C A is wrong because each statement may be picked up by a different server B is wrong because any one statement can be executed by only one server C is wrong because this parameter controls the number of servers initially launched, which may change later

For most situations, the built-in variables initialized at execution time provide the basic user and group information for the current script To recap, the relevant variables are summarized in Table 11-1 Note that all of this information and the functions in this chapter are only really relevant on a Unix machine Neither Mac OS nor Windows has the same facilities However, under Windows you can use the Win32::AdminMisc or

11:

In this chapter you will learn to 05261 Work with Tablespaces and Datafiles 05262 Create and Manage Tablespaces 05263 Handle Space Management in Tablespaces

Win32::NetAdmin modules to determine the same information See Appendix B for more information on the Win32::NetAdmin module, and Web Appendix B at wwwosbornecom for a list of other Win32 modules The most basic function for determining your current user name is the getlogin function, which returns the current user name (not uid) of the current process

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The preceding two chapters dealt with the instance and the sessions against it: processes and memory structures This chapter begins the investigation of the database itself All data processing occurs in memory, in the instance, but data storage occurs in the database on disk The database consists of three file types: the controlfile, the online redo log files, and the datafiles Data is stored in the datafiles Users never see a physical datafile All they see are logical segments System administrators never see a logical segment All they see are physical datafiles The Oracle database provides an abstraction of logical storage from physical This is one of the requirements of the relational database paradigm As a DBA, you must be aware of the relationship between the logical and the physical storage Monitoring and administering these structures, a task often described as space management, used to be a huge part of a DBA s workload The facilities provided in recent releases of the database can automate space management to a certain extent, and they can certainly let the DBA set up storage in ways that will reduce the maintenance workload considerably

The next two functions, getpwuid and getpwnam, return, in a list context, the user information as a list of scalar values The getpwuid function gets the information based on the user s supplied ID number, and getpwnam uses the supplied name These provide an interface to the equivalent system functions, which just return the information stored in the /etc/passwd file (on a Unix system)

Figure 38-3. Memory state after first garbage collection Since B and D survived a collection, their generation is incremented to 1. New objects are then allocated, as shown in Figure 38-4.

This returns the following:

Data is stored logically in segments (typically tables) and physically in datafiles The tablespace entity abstracts the two: one tablespace can contain many segments and be made up of many datafiles There is no direct relationship between a segment and a datafile The datafiles can exist as files in a file system or (from release 10g onward) on Automatic Storage Management (ASM) devices

($name,$passwd,$uid,$gid,$quota,$comment,$gcos,$dir,$shell) = getpwnam('MC');

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