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update undo$ set name=:2, ..Question

Posted on 2013-11-12
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I'm seeing this in an AWR.

update undo$ set name=:2, file#=:3, block#=:4, status$=:5, user#=:6, undosqn=:7, xactsqn=:8, scnbas=:9, scnwrp=:10, inst#=:11, ts#=:12, spare1=:13 where us#=:1

What kind of undo activity is that?
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Question by:xoxomos
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 39643322
Anything performing DML to a base table (most end with a '$') is performed by Oracle.

Hard to tell exactly what that means.  You can open an SR with Oracle Support but I really doubt they will provide specifics about what it is actually doing.
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by:xoxomos
ID: 39643358
Thanks.  So you are unable to tell if this is writing to or reading from UNDO?
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slightwv (䄆 Netminder) earned 1000 total points
ID: 39643435
It's an update statement so it's writing somewhere.  I assume your real question is if it uses undo from the undo tablespace?

Again, it's manipulating the base table directly.  If this type of access uses 'normal' system resources like UNDO, only Oracle knows...
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Author Closing Comment

by:xoxomos
ID: 39645525
Thank you.
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