table to understand and check the activity of the log buffer.
Optimizing shared Pools
A shared pool consists of a library cache, a dictionary cache, and a SQL area. The size of the entire shared pool is determined by the parameter shared_pool_size. The optimization of the shared pool mainly takes into account the buffer zone, the data dictionary buffer zone and the information optimization during the session.
Optimizing the library High speed buffer
To optimize the library cache area, you m
As long as you want to use BBB to do even a bit of hardware-related things, you will inevitably use the knowledge of cape and device tree. So although they look strange and a little complicated, they still have to learn. Actually it's not difficult to use. I will only talk about the content that must be used, do not delve into its working principle. The text is basically no nonsense, please read each word carefully, do not omit details.
We already know that there are some official hardware per
",Round (100 * (a. value + B. value)-c. value)/(a. value + B. value) "BUFFER HIT RATIO"From v $ sysstat a, v $ sysstat B, v $ sysstat cWhere a. statistic # = 38 and B. statistic # = 39And c. statistic # = 40;7. Monitor the hit rate of the Dictionary Buffer in SGASelect parameter, gets, Getmisses, getmisses/(gets + getmisses) * 100 "miss ratio ",(1-(sum (getmisses)/(sum (gets) + sum (getmisses) * 100 "Hit ratio"From v $ rowcacheWhere gets + getmisses Group by parameter, gets, getmisses;8. Monito
. Value)/(A. Value + B. Value )) "Buffer hit ratio" From v $ sysstat A, V $ sysstat B, V $ sysstat C Where a. Statistic # = 38 and B. Statistic # = 39 And C. Statistic # = 40; 6. Monitor the hit rate of the Dictionary Buffer in SGA Select parameter, gets, getmisses, getmisses/(gets + getmisses) * 100 "miss ratio ", (1-(sum (getmisses)/(sum (gets) + sum (getmisses) * 100 "hit ratio" From v $ rowcache Where gets + getmisses Group by parameter, gets, getmisses; 7. Monitor the hit rate o
chip has been popular in the market for a long time, chip manufacturers have already released replacements. If you choose this chip, it is likely that you will not be able to buy it in two or two years. As a result, you have to select a new processor, re-design the product, such as time-consuming, money-consuming, labor-consuming, and delaying the market.Bytes ----------------------------------------------------------------------------------------------------------
2. processor Selection
1. Num
8 configurations of stm32 Io ports
1 Input and Output pins of stm32 have the following eight possible configurations: (4 input + 2 output + 2 reuse output)
① Float _ in_floating
② Pull input _ IPU
③ Drop-down input _ IPD
④ Simulation input _ Ain
⑤ Open-drain output _ out_od
⑥ Push and pull out_pp
7. push-pull output of the reuse function _ af_pp
Drain output of the reuse function of the queue _ af_od
In the output mode of the 1.1 I/O port, three outp
height. B. A pulling resistor must be added to the OC door circuit to increase the output level.
2. Increase the drive capability of the output pins. Some single-chip microcomputer pins often use the pull-up resistor.
3. N/A pin protection against electrical and dry cables: On the COMs chip, in order to prevent damage caused by static electricity, unused pins ca
circuit design and software programming.
E. Is it possible to make changes after the design is completed or the system requirements may change during the design process? Can our design adapt to the changes in system requirements?Explanation: avoid selecting a processor to meet the current requirements. In this way, when the transaction requirements are gradually improved, and if there is still room for processor performance, the current product can be reused; the second option is to choose a ch
. statistic # = 39And c. statistic # = 40;7. Monitor the hit rate of the Dictionary Buffer in SGASelect parameter, gets, Getmisses, getmisses/(gets + getmisses) * 100 "miss ratio ",(1-(sum (getmisses)/(sum (gets) + sum (getmisses) * 100 "Hit ratio"From v $ rowcacheWhere gets + getmisses Group by parameter, gets, getmisses;8. Monitor the hit rate of the shared cache area in SGA, which should be less than 1%Select sum (pins) "Total
set a selected gpio pin as an input or output and read the values from the pins configured. as some of the gpio's have alternate functions, it is required that, pins have to be initialized as gpio's before executing the following test example. set-gpio is a C-binary that initializes a single pin at a time. (default as input pin)
Import sysimport timeimport redef setpins (pin_no, pin_direction): gpioopnum
1th page: The biggest challenge is to mess up eight bad pins.The relatively high threshold of the PC DIY to some extent suppressed its development in today's environment, so for just touch pc DIY and interested in PC DIY readers to introduce relevant knowledge becomes very necessary. In the last lecture on "picture commentary to see a guide you know the motherboard on the slot" article, the author has taken everyone to know the motherboard of various types of slots. Many readers say that the slo
.pdfFirst, the Circuit connectionThe DM9000E network card chip supports 8-bit, 16-bit, 32-bit mode processors, and the supported processor types are set by the reset value of the chip pin Eedo (65 feet) and the wakeup (79 pin), such as a 16-bit processor that simply takes the two pins down Where the wakeup has a 60K pull-down resistor, the pin can be suspended, or as a NIC chip wake-up output. Please refer to the corresponding data sheet for other mod
Suddenly come into contact, so just write about sharing.First, the array is a reference type, so be careful not to copy the address and not copy the value when copying!in fact, when copying an array, be sure to use the New Creating a new space in the heap is dedicated to storing the array, which is valid. ( 1 )int [] pins = {9, 3, 7, 2};Int[] Copy=new int[pins.length];NBSP; NBSP; for (int i = 0 ; i NBSP; NBSP; { NBS
As long as you want to use BBB to do even the slightest thing that involves hardware, you will inevitably have to use the knowledge of cape and device tree. So although they look strange and a little complicated, they still have to learn. In fact, it is not difficult to use. Below I will only talk about the content that must be used, do not delve into how it works. There is basically no nonsense, please read each word carefully, do not omit the details.
We already know that there are some off
Original reference: Http://docs.osgearth.org/en/latest/developer/maps.html#programmatic-map-creationI have limited translation skills ...Loading Earth Map Fileosg::node* globe = osgdb::readnodefile ("myglobe.earth");The simplest wayAPI-Programmed Map creationThe basic steps for creating a map with the API are:1. Create a Map object2. Add the image layer and elevation layer where you think fit3. Create a mapnode that can draw "map objects"4. Add the Mapnode to the scene map.You can add layers to
database functions can also retrieve other attributes of processes, such as resource utilization and execution times.Wall Clock Time (wall clock time) is the elapsed timeUser CPU time (User CPU time) is the process spent in the execution user modeCodeTotal time onSystem CPU time is the total amount of time spent on executing kernel code.This information can be obtained through times or getrusage.Getrusage# Include Clock_t times (struct TMS * BUF );Ti
created ).ExecFamily functionsExecl/execlp/execle/execv/execvp/execveThe main difference between functions is the number of percentages. In this example, L indicates the list form, V indicates the pointer array form, e indicates the environment variable, and P indicates that the number of percentages indicates the relative path, it will be searched in the path.
Parent and Child Processes
The sub-process and the parent process share only the read text segment. For the BSS segment, the pair, and
$ this = $ (this); // var $ name = $ ("p. black strong ", $ this); var $ ding_num = $ (". ding_num ", $ this); // name of the book var name = $ name. text (); var ding_num = $ ding_num.text (); // ding_num = parseInt (ding_num); // var vote = new Vote (++ I, name, ding_num); allVote. push (vote) ;}); function desc (x, y) {if (x. ding_num> y. ding_num) {return-1;} else if (x. ding_num
Resource:
A new example of anti-DDOS test for ITEYE is added:
Instructions for use:
1. chrome first opens a
= 2 fi} # monitor service status ServerMonitor () {# service status monitoring timeout = 10 makfails = 2 fails = 0 success = 0 while true do/usr/bin/wget -- timeout = $ timeout -- tries = 1 http: // 192.168.20.84/-q-O/dev/null if [$? -Ne 0] then let fails = fails + 1 success = 0 else fails = 0 let success = 1 fi if [$ success-ge 1] then exit 0 fi if [$ fails- ge 1] then Critical = "TMS application service fault, please handle it urgently! "Echo $ Cri
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