Oracle locking question

ADDR KADDR SID TY ID1 ID2 LMODE REQUEST CTIME BLOCK
00000004160D72B8 00000004160D7310 1966 AE 100 0 4 0 499 0
00000004160D7FD0 00000004160D8028 1966 TO 81148 1 3 0 498 0
FFFFFFFF7B646EB0 FFFFFFFF7B646F10 1966 TM 79582 0 3 0 23 0
0000000414E1A040 0000000414E1A0B8 1966 TX 393244 678662 6 0 23 0
I am getting above locks when i am ussing select for update no wait from oracle forms and it lock the whole table I can not under stand why.
When issue the same select for update nowait from sql prompt I am getting following
ADDR KADDR SID TY ID1 ID2 LMODE REQUEST CTIME BLOCK
00000004160D7798 00000004160D77F0 1997 AE 100 0 4 0 75 0
FFFFFFFF7B646EB0 FFFFFFFF7B646F10 1997 TM 79582 0 3 0 44 0
0000000414F002E8 0000000414F00360 1997 TX 655387 838567 6 0 44 0
and after above when I issue another SQL select for update for different row on same table the second session is:
ADDR KADDR SID TY ID1 ID2 LMODE REQUEST CTIME BLOCK
00000004160D71E8 00000004160D7240 1982 AE 100 0 4 0 4123 0
FFFFFFFF7B645E78 FFFFFFFF7B645ED8 1982 TM 79582 0 3 0 17 0
0000000414E7DDE8 0000000414E7DE60 1982 TX 589848 710577 6 0 17 0
Can someone tell me what is
1. Lock type TO and AE
2. Why locky type TO is there in oracle forms
3. why issuing the same select for update nowait from oracle form does not allow any other session sql or from oracle forms to get the lock on row?
Thank you.

>
I sill not able to get what TO lock type is, this was not in the following:
>
See the Database reference
http://docs.oracle.com/cd/E14072_01/server.112/e10820/enqueues.htm#g950013
>
D Oracle Enqueue NamesThis appendix lists Oracle enqueues. Enqueues are shared memory structures (locks) that serialize access to database resources. They can be associated with a session or transaction. Enqueue names are displayed in the LOCK_TYPE column of the DBA_LOCK and DBA_LOCK_INTERNAL data dictionary views.
A resource uniquely identifies an object that can be locked by different sessions within an instance (local resource) or between instances (global resource). Each session that tries to lock the resource will have an enqueue on the resource.
The Oracle enqueues are:
TO, Temporary Table Object Enqueue

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11g oracle lock question

I'm trying to understand locking on "other end of FK", i..e. operations on child table in 11g. Database version 11.2.0.2.0
Table bal_fct has columns(branch id, acct id, cust id, bal dt, bal ccy id, stmt id, bal amt). PK/Unique index on branch id, acct id, cust id, bal dt, bal ccy id, stmt id in that order. All these columns have FKs. No index on these FKs. There is a bitmap index on acct_id.
An ETL job is doing inserts in bal fct table (child). As I understand, any operation on child table would take RX(mode 3) on parent tables in 11g.
I queried locks taken. It is taking mode 3 lock on all the dimension tables EXCEPT ACCT(acct_id). Why? I assumed that it will take also mode 3 lock on ACCT also. I have read in other threads that bitmap index really don't count in these discussions.
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Edited by: rkuppa on May 26, 2013 7:10 AM
Edited by: rkuppa on May 26, 2013 7:11 AM
Edited by: rkuppa on May 26, 2013 4:23 PM

>
I'm trying to understand locking on "other end of FK", i..e. operations on child table in 11g. Database version 11.2.0.2.0
>
Here are two articles about that by Jonathan Lewis
http://jonathanlewis.wordpress.com/2010/06/21/locks/
http://jonathanlewis.wordpress.com/2010/02/15/lock-horror/
>
Table bal_fct has columns(branch id, acct id, cust id, bal dt, bal ccy id, stmt id, bal amt). PK/Unique index on branch id, acct id, cust id, bal dt, bal ccy id, stmt id in that order. All these columns have FKs. No index on these FKs. There is a bitmap index on acct_id.
An ETL job is doing inserts in bal fct table (child). As I understand, any operation on child table would take RX(mode 3) on parent tables in 11g.
I queried locks taken. It is taking mode 3 lock on all the tables EXCEPT ACCT(acct_id). Why? I assumed that it will take also mode 3 lock on ACCT also. I have read in other threads that bitmap index really don't count in these discussions.
>
You won't get row level locks when a bitmap index is used.
Can you edit your post and clarify it a bit.
You mention 'bal_fct table (child). The table name has 'fct' in it: is this a fact table or a child table?
And post whether your issue is similar to the one in this other thread from yesterday.
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Hi Guys,
We are facing this situation where in our Prod environment is getting many many Oracle Locks.
Users are not able to perform their work smoothly and this hits hard during the month ends.
DB Version= 10.2.0.4
Apps Version = 11.5.10.2
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Trith wrote:
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Edited by: P. Forstmann on 14 mars 2012 13:52
Edited by: P. Forstmann on 14 mars 2012 14:04

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Hi,
I'm studying about Oracle Multitenant and I'm hoping anyone can help me.
We have a 86 TB database, with no compression and we're struggling to backup this database.
So, here is what we thought.
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Questions:
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- This would be transparent to the application? No major changes?
- How the backup would work? Can we backup each plugable database and restore it individually?
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We have a 86 TB database, with no compression and we're struggling to backup this database.
Ok - so give us information about the DB:
1. How is it used
2. Is it partitioned?
3. How is it being backed up now? Are you doing complete backups or incremental ones?
We need details - not just a statement that you are 'struggling'.
Compress the whole database (since it's only inserted data on the database, no updates at all) on the current version - 11.2.0.3. We're hoping to compress at a ratio of 60%, so, it would be at 36 TB, but still a huge database to backup and recover.
We need details:
1. How is data being inserted?
2. One row at a time by multiple users?
3. Bulk inserts once a day?
Less data means there is less to backup. But incremental backups don't backup the entire database anyway so we still need to know HOW the DB is being backed up now: how often and what kind of backups.
You do NOT need to keep backing up old data that has NOT changed. Are you doing that? If so, why?
The simplest solution to solve a 'database too big to backup' problem is to change the architecture so you don't have to keep backing up data that has NOT changed. Oracle's incremental backups already do that so maybe you are NOT using them.
The next step would be migrate to 12c and setup Oracle Multitenant and divide this database into 5 instances (we can do it, because the database is divided in several mobile technologies). Let's suppose this division is equal, so, it would be around 6 TB each database, so, it would be manageable.
I disagree - the NEXT STEP should be to find the cause of your performance issue.
Based ONLY on what you posted the most likely problem is the types and frequency of the backups you are taking.
Have you licensed the partitioning option? If so you can just put each of those 'mobile technologies' into its own partition.
Again - how is data being inserted? If the new data is based on a value (e.g. a date) that distinguishes it from old data you can EASILY just put the newly inserted data into its own new partijtion by using a DAILY partitioned table.
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That would be be EASIEST and MOST PERFORMANT solution to your problem.
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- Do you think we could benefit using Oracle Multitenant?
- This would be transparent to the application? No major changes?
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#1 - impossible to say until you provide the DETAILS ask for above about
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2. HOW often the data changes
3. HOW the data changes (e.g. new data for today that distiguishes today's data from yesterday's data)
4. Why you are performing the backups the way you are
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null

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<<<<<<<<<<<<<<<<<<<<<<<<<<<
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>>>>>>>>>>>>>>>>>>>>
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Edited by: user6445925 on Sep 23, 2010 3:31 PM

Hi,
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Then apply 9032412.
Then it looks like I apply either CPU Patch 9655017, or PSU Patch 9654991.
But PSU 9654991 REQUIRES PRE-REQUISITE 10.2.0.4.4 so I can't apply that right?You can apply this patch -- In the download page, select the patch for 10.2.0.4 database.
I will apply 9655017 instead and will that get me to 10.2.0.4.5?This is a CPU patch and it will not move you to 10.2.0.4.5 -- Apply either PSU or CPU
Can E-Business Users Apply Database Patch Set Updates?
http://blogs.oracle.com/stevenChan/2009/08/can_ebs_users_apply_database_patch_set_updates.html
Q2. My configuration is DB Tier with CCM and an app Tier running forms, reports as mentioned.
Do I have to worry about the Fusion Middle-ware stuff?If you do not have Fusion installed, skip the part about its patches.
Q3. Patches to apply to E-Business Suite.
Looks like 9578142 applies to my environment.
Check the pre-reqs to ensure I have anything that needs to be applied first.
Then depending on what modules we use or have installed (does it make a difference) I'll apply subsequent patches say for 'Financials'.
Q3. Anything else I need to consider? We are patching Test first and when done if it's all good we'll schedule Prod.Make sure you apply the patches in these docs.
About Oracle Applications Technology 11i.ATG_PF.H.delta.7 (RUP 7) [ID 783600.1]
Known Issues On Top of 11i.ATG_PF.H.delta.7 (RUP7) - 6241631 [ID 858801.1]
I realize this is a pretty generic question. My main uncertainty is on the db 10.2.0.4 patch and if the 965517 will get me to 102045 or not.No (already answered above) -- See these docs.
Oracle Database Patch Set Update 10.2.0.4.5 Known Issues [ID 1089052.1]
Changes in the PSU 10.2.0.4.5 release for July 2010 [Video] [ID 1162085.1]
Critical Patch Update July 2010 Patch Availability Document for Oracle Products [ID 1089044.1]
Update - My first patch is giving me the OUI-67620 superset error which I believe is telling me the new patch contains all the fixes from the existing patch so ok to proceed. Right?
ApplySession adding interim patch '9032412' to inventory
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Inventory check OK: Patch ID 9032412 is registered in Oracle Home inventory with proper meta-data.
Files check OK: Files from Patch ID 9032412 are present in Oracle Home.
The local system has been patched and can be restarted.
The following warnings have occurred during OPatch execution:
1) OUI-67620:Interim patch 9032412 is a superset of the patch(es) [ 6600051 ] in the Oracle Home
OPatch Session completed with warnings.
OPatch completed with warnings.See (WARNING MESSAGE "OUI-67078" and "OUI-67620" FROM OPATCH WHEN APPLYING 10.2.X PATCHES [ID 553244.1]). If opatch complete with code = 0 then you can ignore this warning.
Thanks,
Hussein

Oracle OS Question: SolarisX86 or RH Linux?

I could pose this question on either RH or Sun site, but I am unsure whether or not I would get an unbiased answer.
I have a choice of running RH or SolarisX86 with Oracle (Sparc is not debatable - Vendor Relationship issue)
I am interested in hearing from DBAs who handle/maintain/administer large DB/mission critical/hi-volume transactions and what your comfort level would be with respect to Oracle/Solaris X86 vs Oracle/Linux in the area of
1. OS patch maintenance/sys admin (drivers, kernels, etc..)
2. OS compatibilities (hardware drivers)
3. Oracle performance on each OS
4. OS specific issues (both pros and cons) (related to Oracle only please)
5 Commercial Support Programs (Sun or RH) : cost/ responsiveness etc..
6. and lastly, if you were in this seat, would you bet your job on Solaris86 or RH Linux?
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You should not only consider using RH,but also Enterprise Linux Ref. http://www.oracle.com/technology/tech/linux/index.html.
RedHat is a very good Operating system, but I would not consider it to be ready for mission critical systems. Ref. http://www.ecommercetimes.com/story/31586.html, http://weblog.infoworld.com/dickerson/000691.html, http://searchopensource.techtarget.com/originalContent/0,289142,sid39_gci1068311,00.html

My apologies in advance for Oracle 7 question

Let me thank you all in advance for your help. I am running Oracle 7.34 on Unix. I keep finding the temp tablespace 99.86% filled. How can I find out who is filling up the Temp tablespace.
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Are you running with the tablespace as "Temporary" ?
Are you seeing errors in the alert log re: processes failing because of temp space ?
If yes and no there may not be a problem. Oracle will allocate and manage based on need. It does NOT return the space (to free), but will reuse it.
Otherwise, I was never able to get a good answer to the question myself.
Ken

Oracle locking question

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