Explain the balloon in my scenario
Hello
Can you guys explain values associated with memory, I know that we have documentation, but it is difficult to digest. (Seescreenshot)
I have a virtual machine with 2 vCPU and 4 GB of vRAM
I put resources on the memory limit to 1 024 MB and after that I got the following error "memory usage high ball for UPIDSDWebTest has been replaced by mistake (previous state: warning).
Then I changed the limit to 3 GB. Do not see the error, but still hot-air balloon.
In other words, what is the purpose of limitation?
In other words, what is the purpose of limitation?
An example: consider your boss wants to have a VM for his own use with 16 GB of memory. You assign 16 GB memory (this is what the guest operating system will see) but limit to 2 GB memory (because you know that it will not need 16 GB anyway)
Seriously, I don't see a case of actual use for the memory limits. What I think is an environment where users are charged for the use of the memory physics, but need option to increase dynamically without downtime for the virtual machine (that is, the virtual machine does not support hot-add memory).
André
Tags: VMware
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The guest with the balloon pilot can inflate itself?
The guest with the balloon pilot can inflate itself?
as the topic.
Yes, everything you said is true. With technical virtualization inplace, we always try to approve it at 1.5 x or 2 x take an example that will make this much clearer scenario.
As you have a host with 8 GB of memory and you have turned on on four virtual machines each with 4 GB which is overcommitment of X 2. To achieve this level of overcommitment VMkernel uses now several technique of reclaimation of Page like:
Page sharing
Balloon flight
Compression
and Exchange.
There may be a case when high memory pressure is VM1 and VM2 is lightly loaded, in this case balloon pilot will inflate in VM2 and pass the memory address to VMkernel which in turn pass these addresses at VM1. Don't forget THAT VM is completely uinaware in all these transition. Once the need has been filled the balloon VM2 pilot deflate and recover his memory.
Please note that the balloon pilot is nothing but a program that uses the system call named Malloc() to reserve memory.
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How to explain the error in the executable file?
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When an error occurs that I wish I had a popup that says code error, source and EXPLANATION. The code and the only source is so enigmatic sound quite panic inducing the user, whether or not the error is unrecoverable/crash-inducing. Also this would save me having to search the online error code.
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Simple error handler and screw General Error Handler?
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can you explain the purpose of layout and describe when it should be used? __
can you explain the purpose of layout and describe when it should be used?
http://www.Google.com
Use a more specific search term. This will help you get a good answer for your homework. ;-) MS - MVP - Elephant Boy computers - don't panic! -
I mainly work with Word and get these annoying baloons popping up every minute and stay until I x out them. Tell the balloons, Windows has blocked some startup programs, and another ball said: you have files waiting to be burned to the disc. Is there a way to stop these from popping up every minute?
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That's maybe what you are looking for:
http://www.Vistax64.com/tutorials/145523-notification-area-balloon-tips-enable-disable.htmlt-4-2
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Can someone please explain the usefulness of "Libraries" in Windows 7?
Can someone please explain the usefulness of "Libraries" in Windows 7?
All this means to me is that:
1. it can be indexed, whoop-de-doo! I know how to turn on the indexing of files.
2 takes Double extra clicks to get the folder I want to!
3 half-G * D - D * M-TIME, I find myself clicking on a duplicate, My Documents link only which is access denied and have to click on the actual file just next door!Suffice it to say. I ALSO HATE the frickin' Ribbon in Microsoft Office and I woke up on the wrong side of The Bed upwards!
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Windows Net Admin - more than 20 years.
Understand the win - 7 library system,
http://www.howtogeek.com/HOWTO/10283/understanding-the-libraries-feature-in-Windows-7/
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decide to move to optimization soon. Book says join faster that the subquery in this example because the analyses involved. The "cost" to the subquery appears lower than the cost for the join. So it is confusing to me - aka How should I be interpreting this.
Plan of subquery:
join plan
as you can see that the plan for the subquery has less than a cost. Could someone explain these outputs as to which application is more effective. I need to start somewhere.
Thank you!
The BEST way to get help when you ask questions is:
1 ask questions on SPECIFIC things
2. tell us EXACTLY what term, value, etc. ask abaout
Book says join faster that the subquery in this example because the analyses involved. The "cost" to the subquery appears lower than the cost for the join. So it is confusing to me - aka How should I be interpreting this.
OK - what BOOK are you talking about? There is not much interest to mention a book if you're not going to tell us which book it and provide a link to it and even a page number. This gives us the SCOPE of your question.
This "cost for the subquery" are you talking about? Be specifc. It is in one of the plans that you posted? What plan? Whose cost is it? For example, you could say:
I have a question for the foreground below. Why is the cost to the xx line lower than the cost of the second plan on line AA?
This question refers CLEARLY to the info we're talking. The way in which you stating the question, we try to guess what plan and the lines you want to say.
subquery plan: join plan as you can see the subquery plan has less of a cost. Could someone explain from these outputs as to which query is more efficient. I need to start from somewhere.
Are you talking about line #1 in each of these plans?
Please edit your post and tell us EXACTLY what you ask in the topic and refer to values and SPECIFIC lines. Also post a link to the book and a reference to a page number you got the information from.
The optimizer generally chooses the REAL implementation with the lowest cost plan. It is not clear whether the plans that you have posted are ACTUAL spending plans that Oracle really determined and used or just explain plans.for what Oracle thought it might use.
If the statistics are not up-to-date these plans do not yet reflect the reality of the data.
And if the amount of data is a small number of blocks or other of these plans can run better than the other in reality.
You can find this Oracle white paper "Explain the Plan explaining" useful
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Question about cardinality (lines) to explain the plan
I have two tables (names have been changed to protect the innocent):
TABLE 1:
The Null columns? Type
-------------------- -------- ----------------------------------------------
Table1_Primary_Key NOT NULL NUMBER
more than 10 columns
TABLE2:
The Null columns? Type
-------------------- -------- ----------------------------------------------
Table2_Primary_Key NOT NULL NUMBER
more than 8 columns
Lines of table1 has 1097172
Rows of table2 has 160960
I am analysis request and get explain below:
SELECT t1. Table1_Primary_Key
--
FROM TABLE1 t1,
From TABLE2 T2
--
WHERE t1. Table1_Primary_Key = t1. Table1_Primary_Key
AND t2. Table2_Primary_Key = 3432798
/
------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1. 21. 5 (0) | 00:00:01 |
| 1. NESTED LOOPS | | 1. 21. 5 (0) | 00:00:01 |
| 2. TABLE ACCESS BY INDEX ROWID | TABLE2. 1. 12. 3 (0) | 00:00:01 |
|* 3 | INDEX UNIQUE SCAN | TABLE2_PK | 1. | 2 (0) | 00:00:01 |
| 4. TABLE ACCESS BY INDEX ROWID | TABLE1. 1096K | 9634K | 2 (0) | 00:00:01 |
|* 5 | INDEX UNIQUE SCAN | TABLE1_PK | 1. | 1 (0) | 00:00:01 |
------------------------------------------------------------------------------------------------
As you can see it table2 is exactly 1 row and join table1 on a correspondence of single line.
My question is this:
Why the plan of the explain command seems (at least for me) to indicate that it looked like all the rows in TABLE1?
Thank you
Thomas
the optimizer's decisions are based on the object (and maybe system) statistics: so it's a good idea to provide as much information as possible in these statistics. Basically, there is nothing wrong with statistics automatic collection job - so I would count on that if I don't have very good reason to use anything else. Of course, there are some situations in which it's a good idea to add a few adjustions for automatic collection: sometimes, there is too much created histograms, sometimes there is too little (basically you have histograms when the distribution of the data is not yet). And if there are columns with correlated values who serve together in boundary conditions then create extensive statistics may be a good idea. To make these adjustions, you can use the routines of pref dbms_stats. And sometimes, it may even be a good idea is not to collect statistics for an object and use the sample dynamic (dynamic statistics) for more detailed information on the cardinality of distribution and join.
In the book of my opinion Jonathan Lewis cost base Oracle Fundamentals still contains the best explanation of the use of optimizer statistics - and Christian Antognini Oracle performance troubleshooting also provides a lot of valuable information about statistics and their gathering. Of course the documentation also explains the basics in detail: Managing optimizer statistics - 11 g Release 2 (11.2). And if you want to get a shorter summary, then you can always take a look at the Web of Tim Hall site: https://oracle-base.com/articles/misc/cost-based-optimizer-and-database-statistics.
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Explain the Plan of DBA_HIST_SQL_PLAN
Hello
I have the SQL_ID of a poor performing stmt of sql and I need to get the plan to explain the same DBA_HIST_SQL_PLAN.
Please let me how can know I generate an explain plan of DBA_HIST_SQL_PLAN using sql_id.
Kind regards
VN
That's fine - the service is available in this version. (I asked because I thought that might be a function g 11 - but I just checked, and it's in 10 gr 2 as well).
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Please refer to the help documents below to download the application Adobe CC:
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a sql id have more than explain the plan so I'd like to come up with plan used at runtime.
Hi all
In a sql oracle11g having id several explain the plan so I'd like to come up with plan used at runtime.
For example SQlID:-8yczg5zav14vt have 5 sql plan and I want to check that we execute at any time, please let me how I can check by sql queries
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Ranjeet
RanjeetSohale wrote:
I am ok for that but active only plans is right, but in accordance with the foregoing, two data line table in the table SQL V$ so both active and plan cost is high and the other is low.
Yes that's right cost is different, he means here another effective plan for oracle will analyze the declaration again and stored as new slider of the child. Especially since I explained that.
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I take that back... it seems that there is a way to disable ToolTips if you are using FireFox. I tried and it worked for me.
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You can continue to use revel for free with the new model change, however, if you have registered more than 2 GB of files, then you will not be able to download additional photos or videos until you delete some files to get below the limit you or subscribe to get unlimited downloads.
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