rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

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The recovery process using RMAN is much simpler than the user-managed recovery technique. First of all, you don t need to tell RMAN where to get the backup file from it identifies the correct file from its recovery catalog. All you have to do is tell RMAN to restore and recover the necessary datafile. RMAN restores the datafile(s) first and then performs the necessary recovery on the datafile(s) using the archived redo logs. RMAN knows what archived logs to apply to the restored datafile(s). Let s use a RUN block to perform our datafile recovery, as shown in Listing 16-4. Recovering a datafile is a two-step process: to recover a datafile, you must first restore it from the RMAN backup. The RESTORE DATAFILE command asks RMAN to restore the necessary datafile. The RECOVER DATAFILE command that follows tells RMAN to perform recovery on the restored datafile. Listing 16-4. Recovering a Datafile Using RMAN RMAN> RUN { 2> restore datafile 'C:\ORACLE\PRODUCT\10.1.0\ORADATA\NICK\SYSAUX01.DBF'; 3> recover datafile 'C:\ORACLE\PRODUCT\10.1.0\ORADATA\NICK\SYSAUX01.DBF'; 4> } starting full resync of recovery catalog full resync complete Starting restore at 12-JUL-08 using channel ORA_DISK_1 channel ORA_DISK_1: restore complete Finished restore at 12-JUL-08 Starting recover at 12-JUL-08 using channel ORA_DISK_1 starting media recovery . . . media recovery complete Finished recover at 12-JUL-08 starting full resync of recovery catalog full resync complete RMAN> Note that behind the scenes, RMAN automatically applies any necessary archive logs without prompting from you during the recovery step.

If the database instance crashes or can t be started without an error, as the result of a missing or damaged datafile, the identity of the datafile is obvious. However, you can lose a datafile and continue to have an open database. You can use the following statement to find out which files may need a recovery: SQL> SELECT file#, status, error, recover, tablespace_name, name FROM V$DATAFILE_HEADER WHERE RECOVER = 'YES' OR (RECOVER IS NULL AND ERROR IS NOT NULL); The various possibilities that can be shown in the output of the preceding query can be interpreted as follows: If the query results in no rows selected, then none of the datafiles need recovery. If the ERROR column shows NULL, and the RECOVER column says YES, you can recover without having to restore a copy of the datafile.

If the ERROR column is not NULL, there may be a media problem. Similarly, if the RECOVER column doesn t show the value NO, there may be a problem with the disk. In all the previous cases, first check whether the problem is temporary and can be fixed without replacing the media. If the problem isn t temporary, you ll have to perform media recovery. A NULL value in the RECOVER column indicates a hardware error. You can also use the following query of the V$RECOVER_FILE view to find out the file number, status, and other error information for datafiles: SQL> SELECT file#, error, online_status, change#, time FROM V$RECOVER_FILE; To recover from the loss of a datafile while the database is open, you must first take the affected tablespace offline. You must then restore the datafile from a backup and recover the tablespace. Here s a summary of the commands you need to use: SQL> ALTER TABLESPACE sales01 OFFLINE IMMEDIATE; SQL> HOST cp /test01/app/oracle/backup/sales01.dbf /test01/app/oracle/oradata/finance/sales01.dbf; SQL> RECOVER TABLESPACE sales01; SQL> ALTER TABLESPACE sales01 ONLINE; The ALTER TABLESPACE OFFLINE and ONLINE commands ensure that users don t access the tablespace during the recovery process.

In Figure 7-48, DMZ is a demilitarized zone, which is a section of enterprise infrastructure protected from the outside world by firewalls. Buses can carry both PC and SR signals. In Figure 7-48, the bus name tells you that PC signals are sent over the bus, because the Java RMI protocol is used. Two signals in the diagrams are qualified with the sender s name to distinguish between signals with the same name sent from different places. When useful to readers, a bus name can include other details about a remote connection, such as the protocol, the transmission speed, the connection type (e.g., dial-up or leased line), or other. Signals exiting a bus in a distributed system may need to be qualified with connection information, such as the protocol used, the network address, the network port, or other. Figure 7-49 shows a component accepting SR signals from a bus.