Can you have too many rows in a table?

How many rows would you consider to be too many for a single table and how would you re-arrange the data if
asked?
any answers?
sukai

I have some tables with over 100 million rows that still perform well, and I'm sure much larger tables are possible. The exact number of rows would vary significantly depending on a number of factors including:
Power of the underlying hardware
Use of the table – frequency of queries and updates
Number of columns and data types of the columns
Number of indexes
Ultimately the answer probably comes down to performance – if queries, updates, inserts, index rebuilds, backups, etc. all perform well, then you do not yet have too many rows.
The best way to rearrange the data would be horizontal partitioning. It distributes the rows into multiple files; which provides a number of advantages including the potential to perform well with larger number of rows.
http://msdn.microsoft.com/en-us/library/ms190787.aspx

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I have some tables with over 100 million rows that still perform well, and I'm sure much larger tables are possible. The exact number of rows would vary significantly depending on a number of factors including:
Power of the underlying hardware
Use of the table – frequency of queries and updates
Number of columns and data types of the columns
Number of indexes
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http://msdn.microsoft.com/en-us/library/ms190787.aspx

You have too many sessions open. Please close one and execute the workitem.

Hi all,
I am new to Portal.
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wanda89 wrote:
Most started out with 200-250 limits and now are at 1,000 or more in less than a year.Well, as noted, store cards can be a building tool and as I understand it you have been in that process for about a year and congrats on your progress. That said, I would not be applying for any additional store cards if there is not a specific need for it. This is not the type of credit you want in your profile in the long run. With regard to closing them: I don't know how this will affect your UTIL as I am not aware of your other cards limits however there are many people that have closed these types of cards when they determined there was no use for them, they were not needed any more, they were not the type/quality of cards they wanted to have in the long run, and lastly the history of that card would remain on their report for 10 years. Some bare bones info and the affects of closing cards: http://ficoforums.myfico.com/t5/Credit-Cards/Closing-Credit-Cards/td-p/347190 All that said, while the above lists the math of it all, if you will, it does not speak to the aspect of quality. As you continue to grow, how do you want your profile to look to lenders? Do you want to have 10 low quality store cards won by the credit card trick with limits in the 1k range that you may never use and can't really use substantially anyway as your UTIL would go through the roof very quickly with a 1k limit or do you want a lower number of high quality cards with healthy limits that will continue to grow overtime if you show them the respect they deserve?

What happens to the cube performance when you have too many UDAs?

Hi,
what's the impact on the cube performance if you have too many UDAs associated with the same level of members? Let's say 15 UDAs for each member
If attribute is not an option, what's another way to help alleviate the data load?

Hi,
Adding UDAs to the outline doesn't impact the size of Essbase database.
I've seen cubes with over 70 UDAs. And I think UDAs is the best choice to set load rules.
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I'm frustrated, I am doing everything you recommend, I use only two channels, have plenty of memory in my hard disk, and external hard drive, no effects, and still having problems with Garage band. Giving messages as you ave too many live channels, the disk is slow prepare...can you help?

Quote from: Richard on 15-November-07, 20:33:05
tornado2003,
What you need to do is boot into Safe Mode. Then delete the VGA Drivers.
After that boot normally and install the latest nVidia ForceWare Drivers
Take Care,
Richard
i guess you missed that:
Quote from: tornado2003 on 15-November-07, 17:26:52
ive tryed booting xp in safe mode but it just freezes after it loads up a couple of needed files .
ive even formatted my hard drive and tryed installing a fresh xp on it but it just keeps locking up when it gets to the "starting windows setup" .(this is just after it loads all the drivers from the xp cd)

What to do if you have too many devices for 1 apple Id

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If you asking me, I would suggest to additonally use a second storage service which also allows you to store your pictures over the 30 days period. I personally use Dropbox with automatic upload for that (https://db.tt/cMEgDUFZ), but there are also other storage services like Flickr for example.

CLD Tips - you can't have too many

Here's some specific practice items you might work on in preparation for the CLD.
Practice coding a timer that can be Paused, Restarted, Stopped, and Reset to Zero. Practice coding this timer from scratch. There are several examples on the forums of these timers.
Practice using the Timer express VI (don't reinvent the wheel if this timer will work for you. NI does not deduct points for using this VI, and it is in fact a very useful tool)
Practice your ability to properly apply a reset to the timer(s) in a state machine.
Practice accumulating a counter which can be reset by a user or automatically if a test is restarted. Remember, you will typically count how many times an event successfully takes place.
Practice subtracting elements from one thing while adding to another, and keep track of it. For example, subtract rocks from a rock pile while adding rocks to a dump truck. The rock pile has X rocks but the dump truck can hold only Y rocks. Say it takes 3.5 trips of the dump truck to carry away all the rocks. Can you keep track of that type of operation?
Practice creating and reading to/from an INI file, TXT file, Binary file, and CSV file.
Practice code that uses the File Dialog box, and handle all user input, including Cancel (don't let it throw an error, handle it).
Practice coding a proper sequencer using a State Machine. Your sequencer should be able to carry out a list of commands in a queue or array, and...
...be able to skip certain steps if requested by the user
...be able to be paused and then continued, while not loosing data such as time acrued on the current step.
...be able to be stopped and aborted, with exceptions handled, and your program goes to a proper state afterwards
...be able to be used again without stale data like timer values or skipped steps from past runs mucking up the new run
and the most important thing in my opinion, which has been said a lot but I'll say it again ....
Practice the sample exams and time yourself
Richard

In terms of time efficiency, a few thoughts. I haven't passed the CLD yet (1 week away for me), but this helped me improve my speed on the practice exams:
Learn to use Quick Drop, plus the Insert feature with Quick Drop. This drastically increased my coding speed. Make a few 3 or 4 letter shortcuts for commonly used diagram items and get used to them. You're given time to prep the LabVIEW environment before the exam, so add your favorite shortcuts. For the test, I would definitely include for/while/case structures, build array, replace array subset, queue functions. If you use variants then include Variant To Data and To Variant.
If you aren't already, get used to Auto-Tool. Using Auto-Tool saves you a second or so every time you want to modify anything on the block diagram or front panel. For EVERY action. A second isn't much on its own until you add it up for almost any click while coding.
When you're doing your planning after reading the spec (or as you read the spec), drop the notes down as comment boxes on the block diagram. This takes care of your planning while also starting your documentation.
Get used to doing a quick "Ctrl+I" to pull up a sub-VI's info. When you spawn a new sub-VI, do a Ctrl+I and go to Documentation. Fill out a quick little note here. Now whenever you do a "Ctrl+I" it'll go directly to Documentation and you can quickly type in a few notes.
Make sure you can quickly throw together your state machine template. I like to start with the producer/consumer template built into LabVIEW, then do my modifications from there. Whatever you're comfortable with, get used to tossing it together fast.
Good luck everyone!
http://linkd.in/mikele

Genius: "you have no memory because you have too many apps running" ?!?!?!?

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john2049 wrote:
hey all,
just a quick thing. I saw a genius today, because like many of you, i'm not only dealing with antenna issues but also have some really bad proximity sensor stuff. I mean, seriously, i've done three way calls, face timed everyone, end calls of 50-60 percent of my calls, searched maps, made new contacts, etc. all with my face! rrrgggg but what i was more puzzled about was what the genius told me was,
"you have no memory because there are too many apps running in the background" when i questioned and said, didn't steve say, "if you have to think about it, you've done it wrong" yet now i'm having issues with my phone, it is because of the multitasking? does this make any sense...it didn't to me. does he not know what he is talking about....or if he is right, there is nothing i can do about it right? he said there isn't a way to turn multi tasking off, just have manually quit programs.........any advice onto if he is correct...
The genius is incorrect. The apps that are suspended in the background are told to release memory, and if there is a shortage of memory or they don't comply as required they will be terminated at will by the OS (freeing memory). This is all done behind the scenes and will not cause you any memory issues. And the upside is you can switch to them much faster.
Shorter version: memory not an issue with background tasks.

Cab you have too many songs in Itunes?

I currently have 10.000 songs and by the time I'm done it will be around 15.000. Is putting them all in the one library OK to do or is there something else I should be doing.
Thanks
Bob

Is putting them all in the one library OK to do
Yes.
(38613)

Can you have a calculated column in a table not a view?

We have a table which contains a series of rows
Key   Effective Date   Value
1       10/Feb/2006     123
1       23/Oct/2006      456
...We have a requirement to store an indicator that tells us which row is the most current and what the end date of the preceding row was so that we get something along the lines of:
Key   Effective Date   Value   Status         End Date
1       10/Feb/2006     123      HISTORY    22/Oct/2006
1       23/Oct/2006      456     CURRENT   NULL
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Cheers
Richard

My bias would be to create a view that did the calculation.
In theory, you could add those additional columns to a table and maintain the data via a set of triggers, but that would be substantially more complicated than the alternatives for little or no benefit.
A third option would be a materialized view. That might be easier to deal with if you want to have different indexing strategies for current and historical records or if the historical data is queried often enough and updated infrequently enough that it ends up being cheaper to do the calculation once during the update rather than every time the query is run.
A fourth option would be to use stored procedures to maintain the data and have that stored procedure expire the current row and add the new row.
Finally, you might consider version-enabling your table using Workspace Manager rather than writing your own code since Oracle has already written all this code for you.
Justin

Weird behavior when deleting too many rows from a table

Hello ADFr's
I have the following code in my managed bean which removes data from an adf table. I am getting an id set from a calling process in my app.
DCIteratorBinding tableIterato = getIterator(); // returns iterator of the table being modified
RowSetIterator rsi = tableIterator.getRowSetIterator();
for(Integer id : idSet) {
Key key = new Key(new Object[]{id.toString()});
Row foundRow = rsi.findByKey(key, 1)[0];
foundRow.remove();
My issue ..
This seems to work when the idSet is small 30 or so. But when the idSet is like 50(maybe a littel less) or more, none of the rows seem to be getting deleted. Any clue?
I added this test in there to see if any rows were being deleted after the loop above, and all the records were still being printed out.
for(Row row : tableIterator.getAllRowsInRange()) {
System.out.println("row with name " row.getAtribute("name") " swtill exists");
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Why doesn't this work for any size idSet?

That was it.. thanks Puthanampatti.
I thought about this right after I sent this//
Well maybe this post will help someone else (-;

SQL subquery returning too many rows with Max function

Hello, I hope someone can help me, I been working on this all day. I need to get max value, and the date and id where that max value is associated with between specific date ranges. Here is my code , and I have tried many different version but it still returning
more than one ID and date
Thanks in advance
SELECT
distinctbw_s.id,
avs.carProd,cd_s.RecordDate,
cd_s.milkProductionasMilkProd,
cd_s.WaterProductionasWaterProd
FROMtblTestbw_s
INNERJOINtblTestCpcd_sWITH(NOLOCK)
ONbw_s.id=cd_s.id
ANDcd_s.recorddateBETWEEN'08/06/2014'AND'10/05/2014'
InnerJoin
(selectid,max(CarVol)ascarProd
fromtblTestCp
whererecorddateBETWEEN'08/06/2014'AND'10/05/2014'
groupby
id)avs
onavs.id=bw_s.id
id RecordDate carProd       MilkProd WaterProd
47790 2014-10-05   132155   0 225
47790 2014-10-01   13444   0 0
47790 2014-08-06   132111   10 100
47790 2014-09-05   10000   500 145
47790 2014-09-20   10000   800 500
47791 2014-09-20   10000   300 500
47791 2014-09-21   10001   400 500
47791 2014-08-21   20001   600 500
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id RecordDate carProd       MilkProd WaterProd
47790 2014-10-05   132155  0 225
47791 2014-08-21   20001   600 500

Help your readers help you. Remember that we cannot see your screen, do not know your data, do not understand your schema, and cannot test a query without a complete script. So - remove the derived table (to which you gave the alias "avs")
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When i want to return to my home page I click on the home icon and it resets the page to my home page but also open a blak tab which i don't want how can I stop this as i have too many tabs open.

When I want to return to my home page after looking at a website I click on the home icon and it resets the page to my home page but also open a blak tab which i don't want.How can I stop this as I have too many tabs open and have to close all of them.

You may have an unwanted extension that is modifying sites (or the toolbar area). Try this:
Disable ALL nonessential or unrecognized extensions on the Add-ons page. Either:
* Ctrl+Shift+a
* orange Firefox button (or Tools menu) > Add-ons
In the left column, click Extensions. Then, if in doubt, disable.
Usually a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.
Does that flush the tab?
Please report back on anything suspicious you find so others can learn about its bad behavior.

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Hello all,
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How many libraries can you have in i photo?

How many libraries can you have in i photo?

gussie88 wrote:
Was she satisfied eventually!!! haha If you export and import photos to a new library, do faces -places etc transfer too? Thanks
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Can you have too many rows in a table?

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