How much Redo

Hii
How can I which session or sql created most redo in past ?
I could not find any awr table that releated about v$sesstat or is there any v$ view That I calculate redo size of sql that has point to past
Best Regards

Hi,
have a look there
http://www.adp-gmbh.ch/ora/concepts/redo_log.html
or there
http://download.oracle.com/docs/cd/B10501_01/server.920/a96521/onlineredo.htm
or on forum
http://forums.oracle.com/forums/search.jspa?objID=f61&q=how+much+redo
regards,
Tom

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When & how much redo record will be produced?

oracle tech is so hard to study !!! uh uh uh!!
to be first , i knowe DML operations will cause to redo action. to this ,except for dml ,and when , can cause to redo ??
online redo log file is stored redo records , then how to store it ? can i put my sight into the log file to learn how do redo file organise and manage so much redo records .
secondly , it is right that insert operate (noindex) bring 1 redo record ,
and update will bring 2 redo record ?
thanks a lot

secondly , it is right that insert operate (noindex) bring 1 redo record ,and update will bring 2 redo record ?
Your question confuses. However, when you update value and the columns has the index, its 2 transactions for index, update in index = delete+insert.
to be first , i knowe DML operations will cause to redo action. to this ,except for dml ,and when , can cause to redo ??Oracle recursive sqls + sometime due to block cleaouts, a select statement also generates redo.
Jaffar

How much Redo log is being generated by a user sesssion?

How can find which user session is creating the highest redolog entries and how much rego log is being generated?

1) Query V$SESS_IO. This view contains the column BLOCK_CHANGES which indicates how much blocks have been changed by the session. High values indicate a session generating lots of redo.
The query you can use is:
SQL> SELECT s.sid, s.serial#, s.username, s.program,
2 i.block_changes
3 FROM v$session s, v$sess_io i
4 WHERE s.sid = i.sid
5 ORDER BY 5 desc, 1, 2, 3, 4;
Run the query multiple times and examine the delta between each occurrence of BLOCK_CHANGES. Large deltas indicate high redo generation by the session.
2) Query V$TRANSACTION. This view contains information about the amount of undo blocks and undo records accessed by the transaction (as found in the USED_UBLK and USED_UREC columns).
The query you can use is:
SQL> SELECT s.sid, s.serial#, s.username, s.program,
2 t.used_ublk, t.used_urec
3 FROM v$session s, v$transaction t
4 WHERE s.taddr = t.addr
5 ORDER BY 5 desc, 6 desc, 1, 2, 3, 4;
Run the query multiple times and examine the delta between each occurrence of USED_UBLK and USED_UREC. Large deltas indicate high redo generation by the session.
You use the first query when you need to check for programs generating lots of redo when these programs activate more than one transaction. The latter query can be used to find out which particular transactions are generating redo.

Finding which table generated how much redo

I'm wondering if we can find from any view that during this period a particular table generated how much amount of redo log , other than logminer ?
We have a particular application and want to know which tables are generating most of the redo.

from asktom
see
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:477221446020
and
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:366018048216
Nologging only affects very very specific operations. For exmaple, from the
alter index syntax statement in the SQL reference:
LOGGING|NOLOGGING
LOGGING|NOLOGGING specifies that subsequent Direct Loader (SQL*Loader) and
direct-load INSERT operations against a nonpartitioned index, a range or hash
index partition, or all partitions or subpartitions of a composite-partitioned
index will be logged (LOGGING) or not logged (NOLOGGING) in the redo log file.
In NOLOGGING mode, data is modified with minimal logging (to mark new extents
invalid and to record dictionary changes). When applied during media recovery,
the extent invalidation records mark a range of blocks as logically corrupt,
because the redo data is not logged. Therefore, if you cannot afford to lose
this index, you must take a backup after the operation in NOLOGGING mode.
If the database is run in ARCHIVELOG mode, media recovery from a backup taken
before an operation in LOGGING mode will re-create the index. However, media
recovery from a backup taken before an operation in NOLOGGING mode will not
re-create the index.
An index segment can have logging attributes different from those of the base
table and different from those of other index segments for the same base table.
That also explains why the truncate above generated redo -- The statement
"minimal logging (to mark new extents invalid and to record dictionary
changes)." explains where that redo comes from. The blocks that were truncated
were not logged HOWEVER the changes to the data dictionary itself were.
.

How much time it take to rebuild an index for a table with 20 millions rows

Hi all,
i need to rebuild the index of a table containing 20 000 000 row (i don't know why the other people working on this didn't think of rebuilding the index regularly, because i asked and apparently it has never been done :cry: :cry:) i am not a sql developper nor a DBA so i can't mesure how long it take to rebuild the index, does any one have an idea (aproximativly of course :aie:), the other question is there any formula to use in order to calculate how often to rebuild the indexes (i can for example retieve how much rows are delated or inserted daily ...)
Thanks again
Taha

taha wrote:
:aie: that's why i am asking because i don't know (and to be sure which solution is best)
so the table is like this (the columns) :
45 varchar2, 5 timestamp, 30 Number no LOB columns, (15 indexes : 5 unique indexes and that those indexes uses at a maximum 4 columns)15 indexes - 100,000 deletes: this could mean 1,500,000 block visits to maintain index leaf blocks as the table rows are deleted. If you're unlucky this could turn into 1,500,000 physical block read requests; if you're lucky, or the system is well engineered this could be virtually no physical I/O. The difference in time could be huge. At any rate it is likely to be 1,500,000 redo entries at 250 - 300 bytes per entry for a total of about 400MB of redo (so how large are your redo logs and how many log switches are you going to cause).
yes the tables is used by an application so (update, insert ) can take place at any time
for the deletion , there is the batch which does a mass delete on the table ( 4 or 5 time each day)
You haven't answered the question - how long does it take to do a sample batch delete.
If you can enable SQL tracing, or take a before/after snapshot of v$sesstat or v$session_event for the session as it does the delete then you can get some idea of where the time is going - for all you know it might be spending most of its time waiting for a lock to do away.
>
"How many leaf blocks are currently allocated to the index(es) ?" how can i answer to this question ? may be if i check the all_objects table ?
If you keep your statistics up to date then dba_indexes is a good place, cross-checked with dba_segments, and you can use the dbms_space package for more detail. I have a code sample on my blog which allows you to compare the current size of your indexes with the size they would be if rebuilt at some specific percentage: http://jonathanlewis.wordpress.com/index-sizing/ (It's such good code that Oracle Corp. has copied it into MOS note 989186.1)
Regards
Jonathan Lewis

How much disc space?

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Also, OS X's HFS+ doesn't like getting low on disk space one bit. 10% free space is even consider dangerous to the btree directory.
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http://www.ifixit.com/
See my reply to your second question elsewhere.

Acmcneill1ug 14, 2014 7:16 AM I have IMac OSX 10.9.4, 4GB,Processor 3.06 with Intell2Duo. I would like to check for Malware. I run a TechTool Pro 6 every month and that comes up great. When check how much memory I am using, with only Safar

Acmcneill1ug 14, 2014 7:16 AM
I have IMac OSX 10.9.4, 4GB,Processor 3.06 with Intell2Duo. I would like to check for Malware. I run a TechTool Pro 6 every month and that comes up great.
When check how much memory I am using, with only Safari open I am using 3.9 and more of her 4.0 memory. She is very. very slow in processing. I had 4000
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It has a sign saying a pop-up blocker is on and will not let me do it. I must open the stamp to look at my e-mails and if I have redirected link now I can do it.
I have not changed my preferences so where is this pop-up blocker?
I have looked at preferences on Safari and Google, which I do not understand Google, and do not see where this blocker could be.
Malware is something I want to make sure is not on my computer. Tech Tool Pro 6 is all I know of and it does not detect Malware.
Help.
Ceil

Try Thomas Reed's Adware removal tool. He posts extensively in the communities.
Malware Guide - Adware
Malware Discussion

How do I find out how much of my hard drive space is used up

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I bought an Ipod touch online, how much would it be to get the screan fixed?

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Apple will exchange your iPod for a refurbished one for this price. They do not fix yours.
Apple - iPod Repair price
A third-party place like the following maybe less. Google for more.
iPhone Repair, Service & Parts: iPod Touch, iPad, MacBook Pro Screens
Replace the screen yourself if you are up to it
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Apple's Limited Warranty http://www.apple.com/legal/warranty/ for iPad excludes coverage for damage resulting from accident, disassembly, unauthorized service and unauthorized modifications.
Apple will provide a replacement iPad for:
iPad model
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New iPad
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iPad 2, iPad
$249
Make a Genius Bar Reservation
http://www.apple.com/retail/geniusbar/
You can get the glass replaced at 3rd party repair sources for less $, however, the Apple warranty will be voided.
iPad Repair & Screen Replacement Services
http://www.ifixyouri.com/16-ipad-repairs
RepairZoom iPad Repair
http://www.repairzoom.com/ipad-repair.html
Mission Repair
http://www.missionrepair.com/Apple_iPad_Repair_Services_s/431.htm
iGadgetResQ
http://www.igadgetresq.com/ipad-repair/
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About how much would it be to be fixed by apple

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Your product is covered for eligible hardware repairs and service under Apple's Limited Warranty.
Estimated Expiration Date: 14 May 2012.
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Damage is not covered by warranty, like any other product.
For an iphone 4 in the U.S it would be $149
Out-of-Warranty Service
If you own an iPhone that is ineligible for warranty service but is eligible for Out-of-Warranty (OOW) Service, Apple will service your iPhone for the Out-of-Warranty Service fee listed below.
iPhone model
Out-of-Warranty Service
iPhone 4S
$199
iPhone 4, iPhone 3GS,
iPhone 3G, Original iPhone
$149
A $6.95 shipping fee will be added if you arrange service online or by calling Apple Technical Support. All fees are in U.S. dollars and are subject to local tax.
When setting up out-of-warranty service, Apple will request credit card pre-authorization for the maximum service fee listed above. This amount will be deducted from your credit limit. The final service fee we charge will be determined during testing and may be less than the service fee listed above.
Certain damage is ineligible for out-of-warranty service, including catastrophic damage, such as the device separating into multiple pieces, and inoperability caused by unauthorized modifications. However, an iPhone that has failed due to contact with liquid may be eligible for out-of-warranty service.
Apple reserves the right to determine whether or not your iPhone is eligible for Out-of-Warranty service. iPhones that are repaired or replaced have a 90-day limited hardware warranty or assume the remainder of your standard warranty or AppleCare service contract coverage, whichever is longer. Please see Apple's Repair Terms And Conditions for further details.

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How much Redo

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