Answer / nirav gajjar

The "ORA-01555 snapshot too old" error, which causes user
transactions to fail, is a nightmare for Oracle DBAs and
developers. It usually occurs after queries or batch
processes have been running for a long time, which means
you can lose many hours of processing when the error crops
up.

Answer / kittu

The ora-1555 is too old snapshot. In order to fix this e need to increase undo_retention & undo tablespace size

Other than making use of the statspack utility, what would you check when you are monitoring or running a health check on an Oracle 8i or 9i database?

0 Answers  

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How would you go about generating an EXPLAIN plan?

2 Answers  

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what r the types of backup?

5 Answers   CSC,

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Typically, where is the conventional directory structure chosen for Oracle binaries to reside?

0 Answers   Patni,

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Hi This is request to DBA man Q. I have installed Oracle 10g Express edition in Linux fedora Core 6.When i have run the following script for ORACLE _HOME environment variable setting . script is ". /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/oracle_env.sh" variable is set but it is working only in current session. If i restart the system again i should run that script. So haw to set permanently ? even i have try with export command for that environment set it also does not work. Q. When i run sqlplus in shell prompt It is working but when i give user name and password the following error come out i.e # sqlplus SQL*Plus: Release 10.2.0.1.0 - Production on Fri Apr 2 19:45:40 2010 Copyright (c) 1982, 2005, Oracle. All rights reserved. Enter user-name: system Enter password: ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist Linux Error: 2: No such file or directory I have also proper partition of disk means swap memory are available. # fdisk -l Disk /dev/sda: 40.0 GB, 40060403712 bytes 255 heads, 63 sectors/track, 4870 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 1275 10241406 7 HPFS/NTFS /dev/sda2 1276 4870 28876837+ f W95 Ext'd (LBA) /dev/sda5 1276 3187 15358108+ 7 HPFS/NTFS /dev/sda6 3188 4672 11928231 83 Linux /dev/sda7 4673 4863 1534176 82 Linux swap / Solaris

1 Answers  

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Explain the difference between a FUNCTION, PROCEDURE and PACKAGE.

0 Answers  

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How can you enable a trace for a session?

1 Answers  

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what do you understand by fine-grained auditing?

0 Answers   Oracle,

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What are the different types of database compression introduced in sql server 2008? : sql server DBA

0 Answers  

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You have 4 instances running on the same UNIX box. How can you determine which shared memory and semaphores are associated with which instance?

0 Answers  

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How would you determine who has added a row to a table?

4 Answers  

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Which types of backups you can take in Oracle? 2. A database is running in NOARCHIVELOG mode then which type of backups you can take? 3. Can you take partial backups if the Database is running in NOARCHIVELOG mode?

1 Answers  

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