Disk I/O

Disk I/O

Script
Datafiles Disk I/O
Tablespace Disk I/O
Which segments have top Logical I/O & Physical I/O
Which SQL are doing a lot of disk I/O

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chr function and its values - CHR and ASCII values

chr function returns the ascii letter for that integer. We know that there are 255 ascii characters defined. SQL> select chr(65) as CHR from dual; CHR – A Below code print all 255 ascii characters Sample code to check the values : begin   for i in 1..255 loop       dbms_output.put_line( 'CHR('||i||')' ||'=='|| chr(i) );     end loop;     end;     / This output might differ actually based on the chacterset you have choosen while installing you Database. DBMS_OUTPUT :    CHR(1)== CHR(2)== CHR(3)== CHR(4)== CHR(5)== CHR(6)== CHR(7)== CHR(8)== CHR(9)==    CHR(10)== CHR(11)== CHR(12)== CHR(13)== CHR(14)== CHR(15)== CHR(16)== CHR(17)== CHR(18)== CHR(19)== CHR(20)== CHR(21)== CHR(22)== CHR(23)== CHR(24)== CHR(25)== CHR(26)== CHR(27)== CHR(28)== CHR(29)== CHR(30)== CHR(31)== CHR(32)== CHR(33)==! CHR(34)==" CHR(35)==# CHR(36)==$ CHR(37)==% CHR(38)==& CHR(39)==' CHR(40)==( CHR(41)==) CHR(42...
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RMAN-06820: WARNING: failed to archive current log at primary database

RMAN archive log backup at the standby site is throws the following errors ******************************************************************************** RMAN-06820: WARNING: failed to archive current log at primary database ORACLE error from target database: ORA-17629: Cannot connect to the remote database server ******************************************************************************** RMAN> backup database plus archivelog tag 'FULL_AL_BKP'; Starting backup at 29-FEB-16 RMAN-06820: WARNING: failed to archive current log at primary database ORACLE error from target database: ORA-17629: Cannot connect to the remote database server ORA-17627: ORA-00942: table or view does not exist allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=48 device type=DISK skipping archived logs of thread 1 from sequence 192 to 201; already backed up Finished backup at 29-FEB-16 Starting backup at 29-FEB-16 using channel ORA_DISK_1 channel ORA_DISK_1: starting compressed full datafile b...
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ORACLE FAL_CLIENT and FAL_SERVER explained

FAL_CLIENT and FAL_SERVER are initialization parameters used to configure log gap detection and resolution at the standby database side of a physical database configuration. This functionality is provided by log apply services and is used by the physical standby database to manage the detection and resolution of archived redo logs. FAL_CLIENT and FAL_SERVER only need to be defined in the initialization parameter file for the standby database(s). It is possible; however, to define these two parameters in the initialization parameter for the primary database server to ease the amount of work that would need to be performed if the primary database were required to transition its role. Sample setup: In Primary site: FAL_SERVER=STANDBY FAL_CLIENT=PRIMARY In Standby site: FAL_SERVER=PRIMARY FAL_CLIENT=STANDBY
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