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Listing 23-38. Getting Disk I/O Information SQL> 2 3 4 5 6 7* SELECT d.name, t.name, f.phyrds, f.phywrts, f.readtim, f.writetim FROM V$DATAFILE d, V$FILESTAT f, V$TABLESPACE t WHERE f.file# = d.file# AND d.ts# = t.ts#;

00 and get the right answer, wouldn t it Well, suppose the uncommitted transaction was rolled back We have just counted $40000 that was never actually in the database The point here is that dirty read is not a feature; rather, it is a liability In Oracle, it is just not needed You get all of the advantages of a dirty read (no blocking) without any of the incorrect results..

NAME T.NAME PHYRDS PHYWRTS READTIM WRITETIM ---------- ---------- ---------- ---------- ---------- --------C:\ORACLEN SYSTEM 46180 98697 29637 473716 T\ORADATA\ MANAGER\SY STEM01.DBF C:\ORACLEN UNDOTBS 330 140887 801 165629 T\ORADATA\ MANAGER\UN DOTBS01.DBF C:\ORACLEN DRSYS 649 23 515 0 T\ORADATA\ MANAGER\DR SYS01.DBF C:\ORACLEN INDX 34 23 4 0 T\ORADATA\ MANAGER\IN DX01.DBF SQL>

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Figure 9-19. The basic handshaking interaction pattern Each handshake tells the caller to send more information, if available. The callee can return a handshake immediately upon receipt of each command, or after each command has been processed. An important decision to make when using a handshaking interaction is this: Who has control over termination of the iteration the caller or the callee The answer depends on which party knows when enough is enough. If the caller knows there are no further commands available, the caller will control termination. If the callee can arbitrarily decide when to bail out of the interaction, the callee will control termination. It s also possible for both parties to control termination. When the callee controls termination, the handshake might contain a reserved field or value to indicate a termination request to make the caller stop issuing commands or sending data.

The V$CONTROLFILE dynamic view gives you the names of all the control files. The STATUS column will be NULL if the name can be determined. If the name can t be determined (which shouldn t happen), you ll see the value INVALID in the STATUS column. The IS_RECOVER_DEST_FILE column shows YES if the control file was created in the flash recovery area, and a value of NO otherwise. Here s the output of a query on the V$CONTROLFILE view: SQL> SELECT status, name, is_recovery_dest_file FROM V$CONTROLFILE; STATUS ----------NAME IS_RECOVERY_DEST ------------------------------------- -------------C:\ORACLE\ORADATA\MARK1\CONTROL01.CTL NO C:\ORACLE\ORADATA\MARK1\CONTROL02.CTL NO C:\ORACLE\ORADATA\MARK1\CONTROL03.CTL NO

The READ COMMITTED isolation level states that a transaction may only read data that has been committed in the database. There are no dirty reads. There may be nonrepeatable reads (i.e., rereads of the same row may return a different answer in the same transaction) and phantom reads (i.e., newly inserted and committed rows become visible to a query that were not visible earlier in the transaction). READ COMMITTED is perhaps the most commonly used isolation level in database applications everywhere, and it is the default mode for Oracle databases. It is rare to see a different isolation level used.

The control file carries information in record sections. Information pertaining to data files, for example, comes under the data file record section. The V$CONTROLFILE_RECORD_SECTION view contains information about all control file record sections.

up the saltshaker and shakes it over the pasta repeatedly until the desired amount of salt has been added. In this example, the command is add salt to spaghetti. The caller is the person; the callee is the saltshaker. The handshake is the image of the salt falling on the spaghetti. The interaction is a caller-controlled handshake, because it is the person who decides when to stop adding salt.

The V$ASM_ALIAS view applies only to an ASM instance and not to a normal database instance. It displays a row for every alias present in every disk group mounted by the ASM instance.

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