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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Snapshot Too Old Error on Export !!!
Jackson,
As you have discovered , the issue is that other transactions are
overwriting your read consistent view of the tables.
Options could include
1) Running the export at a quite time (sounds like you have tried that but
with only partial suucess)
2) Taking a direct export which reduces the time very considerably
(especially if you do it at weekend)
3) Take subsets of the data using either a parameter file with export with a
list of tables you are interested in and multiple exports (different
parameter files of course)
4) Using the query option of export to again take subsets of data from the
biggest tables
Using options 3+ 4 means you need to put in some sort of means of capturing changes ( a IUD trigger to capture rowid's) but it will be very difficult to ensure integrity.
Your last sentence is very worrying, I hope you are not using export as a
means of backing up the database because from what you have said that is
totally unreliable.
Out of the above options only 1) will give you any sort of consistent view
of the tables.
John
-----Original Message-----
Sent: 21 February 2003 10:00
To: Multiple recipients of list ORACLE-L
Hi all
I have a problem when doing an export in one of ourt production databases. The export fails with ORA-01555, snapshot too old error.
I have increased the number of rollback segments and their sizes on the database. Also I have went to an extent of specifying the parameter constent=n on my script but backups fails. The worst part is this export runs for a long time and then fails, more than 24 hours.
The only time that this export succeed is over the weekend, because most of the time few people are working or not at all. Now I have tried to start it after hours but as I said it still takes long and end up failing the next day.
Could somebody help me here, this is very critical to be running production without proper backups .....!
Thanx
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Author: Jackson Dumas
INET: tjaros_at_webmail.co.za
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Fri Feb 21 2003 - 05:33:39 CST
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