RE: fetch across commit

Seems you've asked this question twice now, which means you did not understand the answer the first time. OK; the short answer is yes it can cause an ORA-1555 error. The reason is that when you opened the cursor Oracle captured the current SCN, say 100. You've done several updates/inserts/deletes based on the logic of your program and done a commit, which changed the SCN to say 105. In doing so you've told Oracle that you are no longer interested in any rollback segments before SCN 105, when in fact you are. Immediately that is not a problem, but sooner or later part of your cursor will need to recreate a data row to SCN 100 with rollback data. Problem is that you've let it go & consequently Oracle cannot create a read consistent view as of SCN 100 & you get ORA-01555.

One trick I've used rather successfully in the past is to put an "order by" clause on the cursor statement. Order By causes a sort, which means Oracle has to find all of the data that your cursor will need and sort it before handing you the first row. Now all of your return rows are stored in a temp table in the Temp tablespace & no more rollback or read consistent view activity is needed. It's a hack I'll admit, but one that appears to work 90% of the time.=20

Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
-----Original Message-----
From: ryan_gaffuri_at_comcast.net [mailto:ryan_gaffuri_at_comcast.net]=20 Sent: Wednesday, November 24, 2004 1:53 PM To: zimsbait_at_gmail.com; Oracle List
Cc: z b
Subject: Re: fetch across commit

yes, because a commit releases the lock on the rollback segments and orac=3D
le can overwrite them with another process.=3D20 -------------- Original message --------------=3D20

> Listers,=3D20

>=3D20
> I have a question where I need a little clarification about fetching
ac=3D
ross=3D20
> commits. Can this happen if the table being committed to is not the
sam=3D
e=3D20
> as the tables(s) in the cursors?=3D20

>=3D20

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