Noise level and battery specifications?

Hi,
On the Lenovo website there are specifications on noise and batterylife. For example "36db" and "6 hours". But are we talking maximum, minimum or something in between?

Similar Messages

SGE2010 and SRW2008: Noise level and power consumption?

Hello!
I am looking for information on the actual noise level and power consuption produced by the forementioned models.
Many thanks in advance,
Luca

Luca,
Power consumption and other key hardware product attributes can be found in the following document (in the documents section of this community):
https://www.myciscocommunity.com/docs/DOC-8669
WRT noise levels, here they are:
SGE2010 - 51.4 dB
SRW2008 - N/A - there is no fan inside this switch - uses and external power supply
Thanks,
Ivor

Noise level and lost connection

Two or three times aweek I loose connection,hub lights all indicate no problem but on checking find noise level reading on hub of several million db.Unplug hub wait a few minutes and power up again normally solves the problem level back to normal 3-4db.Last week it didn't and after an hour on the phone to BT told there was a problem on the line,got connection back next day and no problems until today when I've had same problem high noise level but has reset OK.
Since BT "solved the connection problem" when running BT speedtest says there are additional services running on my connection.I do not have BT vision,so any ideas hat this is?Could this be causing a problem?
Thank you
Solved!
Go to Solution.

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Result from speedtest .net from 12/4 with new bt hub
Time and date,download uploadping location server and distance to server

Weird noises, vibration and battery?

Okay, so I've just recently noticed that when I tilt my Macbook Air OS X, version 10.9.4, (schoolcomputer) doesn't quite work as usually.
First off, my usbports doesn't work - none of them. This happened like a week ago, and i've never used all of them, just one.
And then tonight when I tilted my mac to the sides there was weird noises sounding, like when you shake your keys.
After that my whole mac started vibrating, and it still hasn't stopped.
And my battery was at 4%, but then suddenly changed to 8%
oh yeah and also, it gave me an electric shock earlier yesterday, but it was only one and nothing happened afterwards, so I just shook it off.
Is it broken or what's happening?

You should make an appointment with an Apple Genius, bringing both the computer and power adapter with you, and discuss your options.

Re: noise level and lost connection

I am with Sky Broadband on a BT leased line (who I pay for my BT Telephone bill).
I have had terrible problems with my ADSL connection ever since I subscribed for Sky broadband over 5 years ago and more.
I live in Halton Village in Runcorn, Cheshire and because I live in the village this means I'm miles away from the telephone exchange which is in the main town of Runcorn.. According to an BT Outreach Engineer I'm approximately 2-3 miles from the exchange which affects my broadband signal and the quality of broadband speed my ADSL connection can provide to a BT Master socket and finally a Netgear DG834PN router. I only a single BT Master Socket in the house for my phone line and ADSL Broadband. So there is no other phone sockets or extensions in the home.
I've experienced dropouts for years. Phoned Sky Broadband Support countless times over the years to get them to test the phone line and quality of Broadband signal.
When experiencing continuous drop outs on my Sky Broadband the main Sky Rambo computer (which monitors the broadband bandwidth connection for signal strength and speed and drop outs, if your broadband connection experiences continual drop outs the Rambo computer re-adjusts and lowers your broadband speed accordingly until this stabilizes the phone line and stabilizes the drop outs. In other words, dropping the Broadband speed from 3MB or 4MB my line can handle to 2.6MB or sometimes even lower will temporarily stop the broadband sync drop outs.
This is to say, even though the BT phone line has no errors or faults simply reducing the broadband bandwidth to 50 Per Cent is a generic method of dealing with unknown factors which could indeed be affecting the Broadband drop outs.
If there is no faults on the phone line causing drop outs, no issues with your router then I would suggest you check the mains "electrical earthing" in your home because any electrical interference, spikes or surges could be affecting your broadband and causing it to intermittently drop out.
I purchased an anti-surge and anti-spike surge protected 3 meter, 4-way (13 amp socket) power extension lead and ensured this was used for my Neatgear router to prevent power spikes and or power surges from causing my router to drop out.
I also purchased an anti-surge and anti-spike 3 socket mains adapter which my 3 meter, 4-way (13 amp sockets) power extension lead plugged into ensuring that the mains socket providing power to my router was fully protected from power surges and spikes.
I also discovered the metal back box for the double mains socket providing 240v mains to my router was not earthed to the back box (original electrician who fitted the back box and double 13 amp 3-pin socket had not earthed the back box) and this was causing a build-up of electrical static on those 2 13 amp sockets and preventing and electrical surge or spike to cause the Netgear DG834PN router to drop out.
Moreover, I have to laptops in the kitchen where my Netgear DG834PN router is situated and when either or both of the laptops were switched on or pluged into the PSU (Power Supply Unit) this caused an electrical spike and consequently resulted in the Netgear DG834PN router from losing electrical power, losing Broadband sync and consequently dropping out.
I also use 4 x TP-Link mains to Ethernet broadband devices around the house, one in the kitchen to feed another T-Link mains to Ethernet broadband connection for my Sky TV distributed through an Netgear GS104 Ethernet Switcher, 1 connection for my Sky HD box, one for my Sony Blu-Ray (for updating firmware and BD ROM data from the internet) and a 3rd Ethernet connection for a laptop of Ethernet networked hardrive containing *.MOV or other video files which I stream via HDMI to my Sony 40 Inch flatscreen HD LCD TV..
I have another TP-Link mains to Ethernet broadband device upstairs in a bedroom studio connected to a Netgear GS108 Ethernet switcher which provides broadband for 7 devices, 1 Windows XP based tower PC, an Apple Mac G5 system and an Apple MacBook Pro and a Ethernet network based harddrive which all the computers on the network can access..
If anything on the electrical mains Ethernet network experiences an electrical surge or electrical spike this will be transported down the TP-Link mains to Ethernet broadband devices (as a complete network circuit) back to the Netgear DG834PN router and cause it to switch off (power down) for a second or two (lose its electrical power "on" status) the Netgear DG834PN router which consequently loses its Broadband sync. It then resets upon powering up only for the static to build up in the mains electrical circuit in the home/house. This static causes electrical spikes and surges and finds its way to the mains electrical socket or mains extension lead which you have your router power supply unit plugged into causing the router to effectively crash/lose its power "on" status then it resets again and powers up to an "on" status thereby attempting to find the broadband sync. This becomes a loop and the drop out problem becomes a continual issue/problem and won't go away until you check your mains earth wiring for any earth faults, particularly in the mains socket providing 240v mains to the Netgear router power supply.
This is why I added anti-surge and anti-spike protection directly from the mains sockets providing mains power in the kitchen in the circuit to my Netgear DG834PN router to prevent any build up electrical static causing any electrical spikes and surges from the mains causing the Netgear DG834PN router to power off and thereby causing the broadband sync to drop out.
Basically, the Netgear DG834PN router power supply switches off during an electrical surge or spike to protect the Netgear DG834PN router otherwise the surge or spike will fry the router (pretty logical when you think about it).
So, in order to ensure other electrical circuits in the house do not also cause a build-up of static or send any electrical surges or spikes down my TP-Link mains to Ethernet broadband plugs I also was required to ensure I inserted an electrical mains anti-surge and anti-spike protector adapter or multiple mains extension lead into the circuit thereby eliminating any build-up of mains electrical static, any electrical mains surges or spikes so those do not get transmitted down the mains circuit compounding the issue.. In other words all the mains sockets connected to the broadband circuit in the house are protected with anti-surge and spike adapters and multiple socket mains leads to prevent the Netgear DG834PN router Power Supply from switching off, the Netgear DG834PN router from dropping out, ensuring the Netgear DG834PN router remains powered up, even when a mains electrical surge or spike occurs, so the electrical mains are anti-surge and anti-spike protected and the Netgear DG834PN router remains in the powered "on" state thereby retaining its Broadband sync and does not drop out.
You will discover you no longer experience Broadband Drop Outs!
Solution, check your electrical mains Earthing in your house and all sockets, particularly the mains socket or sockets providing a 240v electrical mains to your Netgear router Power Supply and ensure all electrical sockets which are connected to any Ethernet broadband circuit in the house is surge and spike protected to stop the Broadband router from dropping out!
If you find you are still experiencing Earthing problems with your electrical mains in your property then engage a qualified electrician to check your electrical circuits in your house and indeed your electrical mains earth. You may even require a new “Earth Rod” ramming into the ground outside your property. Since the advent of plastic water pipes this has compromised a lot of electrical mains earthing when entering house properties and could be an additional issue adding to the issues you are already experiencing..
Like I say, if you are not a technical competent person seek advice and help from a qualified person and or even better from a qualified Electrician..

Some very good advice in your post.
Another very common source of noise in any line is caused by water ingress to the conductors. I was a telephone lineman for 12 years of my 23 years service in the telco industry and I lost count of the intermittent telephone faults that only showed up when it rained!

Excessive Noise Levels

Hi, i'm getting a High Noise Level issue with a Linksys WRT54GL and with a high gain antenna LIN HGA7T. The problem is that at the WRT54GL location there're some neighbour antennas that at certain times off the day seems to be transmiting signals that increase the Noise Level seen by the wireless cards. So from the pc connected via wireless we're having ping responses to the AP for about 700 - 900 ms and sometimes (almost one time a day) it drops the pc from the wireless and it`s really hard to get connected again. When the signal stops, we recover normal noise levels and the ping response is at 1ms without any troubles. We're using WUSB54Gc cards. The question is, if i add another AP could i override the noise level? This would increase the signal strength in order to avoid the disconnection and the bad response times? Which AP should i use to this purpose? Is there any othe solution? Thanks a lot for your help.

Your best solution to this problem will probably be to simply change your router's channel (see more channel info below). However, I have included my full set of wireless connection tips:
There are many causes for poor wireless connections, and many solutions:
First of all, give your network a unique SSID. Do not use "linksys". If you are using "linksys" you may be trying to connect to your neighbor's router. Also set "SSID Broadcast" to "enabled". This will help your computer find and lock on to your router's signal.
Poor wireless connections are often caused by radio interference from other 2.4 GHz devices. This includes wireless phones, wireless baby monitors, microwave ovens, wireless mice and keyboards, wireless speakers, and your neighbor's wireless network. In rare cases, Bluetooth devices can interfere. Even some 5+ GHz phones also use the 2.4 Ghz band. Unplug these devices, and see if that corrects your problem.
In your router, try a different channel. There are 11 channels in the 2.4 GHz band. Usually channel 1, 6, or 11 works best. Check out your neighbors, and see what channel they are using. Because the channels overlap one another, try to stay at least +5 or -5 channels from your strongest neighbors. For example, if you have a strong neighbor on channel 9, try any channel 1 through 4.
Also, try to locate the router about 4 to 6 feet above the floor, in an open area. Do not locate it behind your monitor or near other computer equipment or speakers. The antenna should be vertical.
Also, in the computer, go to your wireless software, and go to "Preferred Networks" (sometimes called "Profiles" ). There are probably a few networks listed. Delete any network named "linksys". Also delete any network that you do not recognize, or that you no longer use. If your current network is not listed, enter its info (SSID, encryption (if any), and key (if any) ). Then select your current network and make it your default network, and set it to automatic login. You may need to go to "settings" to do this, or you may need to right click on your network and select "Properties" or "settings".
If the above does not fix your problem, download and install the latest driver for your wireless card.
For wireless g routers, try setting the "Transmission Rate" to 54 Mbps. For wireless n routers, try setting the "n Transmission Rate" to 162 Mbps, and the (wireless g) "Transmission Rate" to 54 Mbps.
If you still have trouble, download and install the latest firmware for your router. After a firmware upgrade, you must reset the router to factory defaults, then setup the router again from scratch. If you saved a router configuration file, DO NOT use it.
Hope this helps.

Will an iPhone automatically turn off location services. If it goes below a certain battery power level, and so how you disable this in settings.

I am working with Georgia DOT and we have created an app to track our state vehicles using IPhone 5. My question is: will an iPhone automatically turn off location services? If it goes below a certain battery power level, and if so how do you disable this in settings.
Message was edited by: mickyel

I don't believe that this will happen, however, the entire iPhone will shut down when the iPhone reaches the auto-shutdown power level. There is no way to turn that Off other that connecting the iPhone to power.

How should I set the parameters of PID Autotuning such as relay amplitude and PV noise level?

I want to control the temperature of a room by changing the hot water flow of a radiator with a control valve. The desirable control accuracy is +/- 0.5 degree of centigrade.
What number should I set for relay amplitude? And what number should I set for PV noise level?

Hello loghmani,
If your output is saturating try to reduce your relay amplitude and/or reduce the gain Kc of the PID controller before starting the autotuning procedure. You can find more information about each of the parameters that you've inquired about at this KnowledgeBase article.
I would recommend taking a look at the General Auto PID Simulator.vi example. You can find this example by doing a search in the example finder or by clicking linked example at the bottom of the detailed help page of the Autotuning PID.vi.
If you haven't looked at the PID user manual that also contains useful information on setting up PID algorithims and Autotuning.
David A
National Instruments
FlexRIO Product Support Engineer

Required - Battery Level and network signal strent...

It would be very useful if there was a Battery Level and network signal strenth indicators in OVi Suite. IMO even free mobile management apps have this useful feature.So it shouldnt be a problem for Nokia to add this to Ovi suite.

When I connect my N8 to the PC I get the below window pop up.
So it seems the function you describe already exists.
Thanks
Ray

Data usage and battery drain has skyrocketed with iOS 8.1.2 (maybe earlier)

3 weeks ago my wife got a text message on her iPhone 5 from AT&T that she had used 90% of her data for the month. 30 seconds later, she got another one saying that she had used 100%. Granted, her data plan is small, 200 MB. But, for the last two years she has used as little as 17 MB in a month and her largest prior to this latest month was 49 mb. This month she got to 380 mb before we were able to shut off her cell data. Otherwise, a second chunk of 200 MB and another $15 would have been added to the month.
We had noticed that her battery had been draining rather rapidly in standby mode with no background apps running when she didn't have access to WiFi. We have now correlated the two results, High Cell data usage, Quick battery drain and very warm phone. In case anyone is wondering about her iPhone 5 being one in the recall, it is. I took it in and had it tested. Apple says the battery is fine. It does hold a charge well. When all network communications are shut down on her phone and it is in standby mode, there is no noticeable loss of charge in 24 hours (our longest test).
Since I have a grandfathered Unlimited Data Plan with AT&T, I have been doing some testing on my iPhone 5s. Sure enough, I've seen similar results. With nearly everything turned off except Cell Data, I've seen 483 MB used in 24 hours. Of that total, 479 MB was used for Documents & Sync. I even have everything turned off in my iCloud account, Location services are turned off, no push notifications etc...
The best I can figure, this has been a problem since we installed 8.1.2 and yesterday I installed 8.1.3 resulting in no positive effect on this issue.
At this rate of data usage and no access to WiFi, my wife would have to have a 15 Gb data plan to keep from exceeding her limit. I don't think AT&T even offers one that big anymore. I might have to switch to Sprint or T-Mobile if this doesn't get resolved.
Any ideas would be greatly appreciated. Thanks in advance for your shared insights.

Hey this is Brian, bjmcmurry, under a different user ID. If I logged in as bmcmurry, original post, I was just getting a server error and couldn't get to this discussion nor post a comment anywhere.
Anyway, let me be as brief as I can. After an extensive analysis of replicating the problem on another phone to eliminate it being a hardware specific issue and that the test phone has an unlimited data plan, I was able to stop the excessive data usage and consequential battery drain. I believe I have a reasonable explanation of the problem, an iOS logic bug.
I had everything under my control clamped down on the test phone to minimize data usage. Also, I was forcing all data usage to use the cell towers. I determined that I was burning at least 11 to 13 Mb per hour doing nothing important. I literally had everything turned off except 'Settings' was allowed to use Cell data providing a avenue to log into the Apple ID.
The two phones had 2 things in common, they were using the same Apple ID and the same version of the OS. One was a iPhone 5 and the other was a 5s.
Here is a synopsis of my experience via my written evaluation of the Apple support system (Apple Rep name's have been removed):
After a couple of hours on the phone with an Apple Care Senior support Analyst, it was suggested that I go to the Apple Store to 1) get my battery replace in the iPhone 5 since it qualified for the replacement program and 2) see if the Genius could provide me with any insight in the data usage issue and battery drain.
I'm certainly glad I had multiple reasons to visit the closest Apple store, a 45 min drive. I got the battery replaced, thanks for that.
Regarding the important issue to me that brought me to the Genius Bar, excessive Cell data usage, I thought the Genius did a wonderful job listening and documenting the problem we were experiencing. Unfortunately, educating us on the use of the product or replacing our phone was not going to solve the problem. He eventually figured it out, this was not a user error or broken hardware. We surmised that the reason I was sent to him was to verify and document that there was a problem. I clearly had a problem. After writing copious notes on the issue, The Genius smartly referred me back the the AppleCare Senior Advisor. So, back to AppleCare Senior Analyst I went. She, knowing this was not a simple problem to solve i.e. beyond her level of expertise, got an Apple Software engineer involved.
My primary frustration is that this should have been escalated to software engineering right away. My trip to see the Genius was, I believe, a waste of time for both me and Apple regarding this issue. Diagnosis of this type of problem is well beyond the Genius’ knowledge and job. The Genius did a very good job doing what he could within the scope of his job. He just couldn’t solve this problem and had no one within Apple to which he had access for help.
However, that initial consult with the engineer was a bit feeble. Not only could I not talk to him/her directly, his/her focus was still working with the ‘Black Box' approach. Having Analyst ask me to do stuff like restore the Phone was more like trying to find a 'work around' than 'identifying the real problem.' Maybe restoring the phone was going to fix some corrupted data on the phone sidesteping the real problem, the handling of this condition. The engineer did listen to the fact that I had restored the test phone, the 5s, and only added the use of my Apple ID. Duh, been there!!!
Having been an previous owner of a software development company that I started in 1980 and retired in 2001, I can tell you that using the 'Black Box' method of debugging is extremely inefficient. Instead, having access to an ‘Activity Manager’ type app to identify in real time what process was blowing up the data flow would have saved me a lost afternoon at the Apple store and hours on the phone with tech support.
Ironically, I may have stumbled onto a "work around" solution short of turning off Cell Data that stopped the excessive Cell Data usage and consequential battery drain. Just prior to leaving the Apple Store, I used one of their Macs to log in my Apple ID on the id.apple.com website to ‘Manage my Apple ID’, I was forced to upgrade the security level of my password. Afterward, my cell data usage seemed to drop dramatically.
I told the AppleCare Senior Analyst that I may have stumbled onto a workaround and I suggested that I give it a couple of days of monitoring. We'd talk then and I would have results to report. She agreed.
Sure enough, my Document & Sync usage was back to normal, about 1/2 Mb per day. Am I happy that the excessive Cell Data usage has stopped? You bet! But, there was no intuitive reason that an end user would know to log in on the ID website to unknowingly solve this problem. As I use to say to my employees, that is not the ‘Macintosh Way.’ And, rebooting the the 'Microsoft Way.'
When I reported my findings to the Analyst, we both concluded that data usage was back to normal. She did report to me that the engineer did provide a laundry list of suggested activities to help solve the problem. Remarkably, they were everything that I had already done and were pretty much what the Analyst and the Genius tried to do. All reasonable tasks. But clearly, the engineer hadn't even ready the notes on the case before responding. And, none of the things suggested would have uncovered the real problem, likely a logic bug in iOS.
My advice now is to have the software engineering team rule out that there was an unresolvable state that a background process was fiercely trying to handle. The iOS does not seem to know how to intervene and prompt the user with a requirement to upgrade their password. If this does end up being the case, I would call it a logic bug, a perpetual exception that is not being handled properly.
Anyway, I hope this helps you.

Why does NI-9233 with IEPE microphone report 39dBA as minimum noise level?

Hi,
I have been using an ACO Pacific 1/2" IEPE microphone and preamp (7052SYS) with cDAQ and a 9233 IEPE module. The ACO mic is very similar to the G.R.A.S. 46AE (50mV/Pa) but with a 20mV/Pa sensitivity. Using this set-up in a hemi-anechoic chamber, the SPL is reported as about 39dBA (using the Sound and Vibration standard 'sound meter' VI). Yet, the third party lab's signal analyzer reports the room at about 25dBA. I have partially verified the NI set-up with a 114dB 1kHz calibrator. The NI set-up indicates about 114.3dBA. So we are on the money there.
Is there a noise floor on the 9233 that I am dealing with? Any thoughts? Recently, my company has built its own hemi-anechoic chamber and we like the NI tools. We had hoped to use the newer 9234 with a cDAQ chassis since the 51.2kS/sec is sufficient for our measurement range of 20-20kHz. We already use cDAQ extensively here.
Thanks,
-JD
Solved!
Go to Solution.

From the 9233 specs:
Integrating Noise density:
A-Weighted Power = ( A weighting power factor for bandwidth ) * (Bandwidth) * ( Noise Level )^2
A-Weighted Power = ( 0.53 ) * ( 20000 - 20 Hz ) * ( 400 nV / sqrt(Hz) / 20 mV / Pa )^2
A-Weighted Power = 4.26u Pa^2 rms
Leq (A-Weighted) = 2.06m Pa rms = 40.2 dB(A) ref 20u Pa
Calculating from Noise at full scale range:
FS = Voltage Range / Sensitivity
FS = ( 5 / sqrt(2) ) V rms / ( 20 mV / Pa ) = 176.8 Pa rms = 138.9 dB ref 20u Pa
Noise = 138.9 dB ref 20u Pa - 95 dB FS - 2.73 dB(A) = 41.2 dB(A) ref 20u Pa
So the fact that you are reading 39 dB(A) indicates that your 9233 noise is meeting specifications. There is still an issue that some effort needs to be made to better match the signal range to the input range of the 9233. You can add some external signal conditioning to apply pregain (20 dB) to the microphone output before the 9233. You also have other DSA hardware options that include input gain.
Doug
NI Sound and Vibration

What is RSSI , SNR and technical specification value in dbm

Hi,
I am little bit confused about RSSI concept and SNR , Signal strength.
One more thing that , what is technical specification of signal strength and SNR and RSSI for 802.11 a,b,g and n
Because as far as application concern , this values get changed eq. voice , video
I need to get the values according to application.

Hi,
RSSI means Receiver Signal Strength Indicator. It's the strength of the signal as perceived as received by the client. It does not have a precise unit of measurement. On client softwares, it's usually a percentage (that has no real meaning). WLC and APs usually show in dbm.
SNR is Signal/Noise ratio. The noise level is usually at -90dbm let's say. This means that if you have a signal at -90dbm, it's completely lost in the noise, it has a SNR of 0.
A signal at -80dbm has a SNR of 10 in the same conditions, it is barely decodable.
However if the noise level is -95 then a signal of -80 will give a SNR of 15 and will be much more decodable.
Noise is usually between -100 and -90 in normal circumstances.
Dbm is another way of expressing power (rather than milliwatts). The advantage of dbm is that you can add or substract antenna gains very easily since those are in db.
20dbm=100mw
The rule is "if you substract 3dbm, divide the mw by 2" and "if you substract 10dbm, divide the milliwats by 10"
So 17dbm = 50mw
13dbm=25mw
10dbm=10mw
The received signal strength which are usually between -40 and -80dbm are then fractions of fractions of microwatts :-)

Information: Update BIOS and Battery Firmware to ensure full charge capacity

Is your system’s BIOS and battery firmware updated to the latest level?
If not, you may not be getting the maximum capacity and run time from your battery!
Lenovo’s engineering team released updated BIOS and battery firmware in July that is applicable to customers who have ThinkPad models:
X100e, L410/L510, L412/L512, SL410/SL510, T410/T410i, T510,T510i, W510 or ThinkPad Edge, 13, 14, or 15 inch units.
Customers who use Lenovo ThinkVantage Toolbox would have received a notification and opportunity to apply this update, and Lenovo’s ThinkVantage System Update tool would also identify and apply these updates.
If you aren’t using either of these tools, and have one of the systems above, please follow this link to our support site. You can learn more there, and download and install the updates specific to your system.
Probably also worth mentioning, is an earlier tip applicable to X200t and X201t tablet users who have 8 cell extended batteries. This technical tip and related BIOS updates ensure these batteries properly charge to their full capacities, and resolves a particular symptom where the battery would stop charging at less than 50%.
Source Lenovo Blogs: Update BIOS and Battery Firmware to ensure full charge capacity
Recommendation before updating bios:
- detach all devices from you system
- undock your system, if docked
- start from a cold boot. (shutting down the system completely, wait 15 min, start up again)
- if possible, upgrade with a cd-rom drive
Edit: Recommendation added.
Follow @LenovoForums on Twitter! Try the forum search, before first posting: Forum Search Option
Please insert your type, model (not S/N) number and used OS in your posts.
I´m a volunteer here using New X1 Carbon, ThinkPad Yoga, Yoga 11s, Yoga 13, T430s,T510, X220t, IdeaCentre B540.
TIP: If your computer runs satisfactorily now, it may not be necessary to update the system.
English Community Deutsche Community Comunidad en Español

How old is your Mac computer? If it is 2+ year old or older you need a new battery. Right there in what you posted is says "Service Battery". That means Change the battery.

Number of folder sub-levels and characters

Does anyone know:
a) how many levels of folders are permissible in Mac OS X
b) how many characters are allowed for file or folder names?
I have recently switched over to the Mac system from Windows where the I believe the maximum number of "folders within folders" (levels in the hierarchy) is 8, and the maximum number of characters for naming files or folders is 64. My main concern is that backups in Windows are truncated beyond these limits.
I've searched for answers in Apple tutorials, forums, books (etc.), and even AppleCare was not able to answer these questions.
Thank you very much!

Thank you. Surprising that there is absolutely no limit on the number of folder levels and greatly appreciate the specific 255 characters information.
There is a path length of 1024 as specified by the pathconf() function:
PC_PATHMAX == 1024
What this means is if you are going to pass a path to a kernel function (and many library routines), the total string length may not exceed 1024 characters.
However, if you do something like
mkdir a
cd a
mkdir b
cd b
mkdir c
cd c
mkdir d
cd d
etc...
you can continue as deep as you wish, you will just need to make sure that when you access any files at the deeper levels that the string specified as the path does not exceed 1024 bytes.

Schema level and table level supplemental logging

Hello,
I'm setting up bi- directional DML replication between two oracle databases. I have enabled supplemental logging database level by running this command-
SQL>alter database add supplemental log data (primary key) columns;
Database altered.
SQL> select SUPPLEMENTAL_LOG_DATA_MIN, SUPPLEMENTAL_LOG_DATA_PK, SUPPLEMENTAL_LOG_DATA_UI from v$database;
SUPPLEME SUP SUP
IMPLICIT YES NO
-My question is should I enable supplemental logging table level also(for DML replication only)? should I run the below command also?
GGSCI (db1) 1> DBLOGIN USERID ggs_admin, PASSWORD ggs_admin
Successfully logged into database.
GGSCI (db1) 2> ADD TRANDATA schema.<table-name>
what is the deference between schema level and table level supplemental logging?

For Oracle, ADD TRANDATA by default enables table-level supplemental logging. The supplemental log group includes one of the following sets of columns, in the listed order of priority, depending on what is defined on the table:
1. Primary key
2. First unique key alphanumerically with no virtual columns, no UDTs, no functionbased
columns, and no nullable columns
3. First unique key alphanumerically with no virtual columns, no UDTs, or no functionbased
columns, but can include nullable columns
4. If none of the preceding key types exist (even though there might be other types of keys
defined on the table) Oracle GoldenGate constructs a pseudo key of all columns that
the database allows to be used in a unique key, excluding virtual columns, UDTs,
function-based columns, and any columns that are explicitly excluded from the Oracle
GoldenGate configuration.
The command issues an ALTER TABLE command with an ADD SUPPLEMENTAL LOG DATA clause that
is appropriate for the type of unique constraint (or lack of one) that is defined for the table.
When to use ADD TRANDATA for an Oracle source database
Use ADD TRANDATA only if you are not using the Oracle GoldenGate DDL replication feature.
If you are using the Oracle GoldenGate DDL replication feature, use the ADD SCHEMATRANDATA command to log the required supplemental data. It is possible to use ADD
TRANDATA when DDL support is enabled, but only if you can guarantee one of the following:
● You can stop DML activity on any and all tables before users or applications perform DDL on them.
● You cannot stop DML activity before the DDL occurs, but you can guarantee that:
❍ There is no possibility that users or applications will issue DDL that adds new tables whose names satisfy an explicit or wildcarded specification in a TABLE or MAP
statement.
❍ There is no possibility that users or applications will issue DDL that changes the key definitions of any tables that are already in the Oracle GoldenGate configuration.
ADD SCHEMATRANDATA ensures replication continuity should DML ever occur on an object for which DDL has just been performed.
You can use ADD TRANDATA even when using ADD SCHEMATRANDATA if you need to use the COLS option to log any non-key columns, such as those needed for FILTER statements and KEYCOLS clauses in the TABLE and MAP parameters.
Additional requirements when using ADD TRANDATA
Besides table-level logging, minimal supplemental logging must be enabled at the database level in order for Oracle GoldenGate to process updates to primary keys and
chained rows. This must be done through the database interface, not through Oracle GoldenGate. You can enable minimal supplemental logging by issuing the following DDL
statement:
SQL> alter database add supplemental log data;
To verify that supplemental logging is enabled at the database level, issue the following statement:
SELECT SUPPLEMENTAL_LOG_DATA_MIN FROM V$DATABASE;
The output of the query must be YES or IMPLICIT. LOG_DATA_MIN must be explicitly set, because it is not enabled automatically when other LOG_DATA options are set.
If you required more details refer Oracle® GoldenGate Windows and UNIX Reference Guide 11g Release 2 (11.2.1.0.0)

Noise level and battery specifications?

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