we continue to use this stored procedure, why does the parameter value trigger Statistics update? 1101 + (500 + 0.2*1101) = 1821.2, that is to say, it must be 1821 to trigger statistics updates. the following SQL Server Profile also verifies our speculation.
EXEC dbo. Usp_Recompile_TEST 1300;
EXEC dbo. Usp_Recompile_TEST 1320;
EXEC dbo. Usp_Recompile_TEST 1321;
EXEC dbo. Usp_Recompile_TEST 1820;
EXEC dbo. Usp_Recompile_TEST 1821;
Therefo
Windows Hash and cracking
Overview
1.1 hash
Hash is usually translated as "Hash", which is also directly translated as "Hash", that is, input of any length (also called pre- ing, pre-image ), the hash algorithm is used to convert an output with a fixed length. The output is the hash value. This type of conversion is a compression ing, that is, the space of hash values is usually much smaller than the input space, and different inputs may be hashed into the same output, therefore, it is impossi
creates/s, 255.25 writes/sBuffer pool hit rate 1000/1000, young-making rate 0/1000 not 0/1000Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/sLRU len: 19993014, unzip_LRU len: 0I/O sum [36104]: cur [1320], unzip sum [0]: cur [0]----------------------INDIVIDUAL BUFFER POOL INFO------------------------- Buffer pool 0Buffer pool size 2621439Buffer pool size, in bytes 10737414144Free buffers 1024Database pages 2597173Old da
The 1064 error indicates that My SQL syntax is incorrect and the specific location of the error is displayed.
View the content to be updated and execute new php statements.
The php statement is as follows:
If (! $ Handle = @ fopen ($ fname, "r") {echo "open $ fname failed \ n"; exit ;}; $ str = ""; $ count = 0; $ ins = "insert into pydot_g (id, aauthor) VALUES"; while ($ buf = fgets ($ handle, 1000 ))! = False) {list ($ id, $ field) = explode ("#", $ buf); $ str. = sprintf ('(% d,' % s'), '
can also read a string, use S.size () to determine whether it is odd or even, then search from left to right.
My Code:1#include 2#include 3 using namespacestd;4 Const intmaxn=3000000;5 //int P[MAXN];6 intM,n;7 //int sum=0;8 //void make ()9 //{Ten //p[1]=1; One //for (int i=2;i A //if (p[i]==0) - //for (int j=2;j - //p[i*j]=1; the //} - BOOLPd_1 (intm) - { - inttemp=m,n=0; + while(temp) - { +n=n*Ten+temp%Ten; ATemp/=Ten; at } - return(m==n); - } - //bool Pd_2 (int m) -
CPU utilization rate from 200% before the optimization, down to about 120%.
Defer is a performance killer, and my principle is to avoid it as much as possible.
Time. Date
Now look at the pprof:
(pprof) topTotal: 3348 samples 254 7.6% 7.6% 266 7.9% syscall.Syscall 177 5.3% 12.9% 221 6.6% hash_next 168 5.0% 17.9% 1320 39.4% dsp_masky/model/bid.(*BidServer).FilterByCampaign 153 4.6% 22.5% 369 11.0% r
1. Create a fruit sales report by color using Jfreechart1 PackageCom.wcy.chart.bar;2 3 Importjavax.servlet.http.HttpSession;4 5 Importorg.jfree.chart.ChartFactory;6 ImportOrg.jfree.chart.JFreeChart;7 Importorg.jfree.chart.plot.PlotOrientation;8 Importorg.jfree.chart.servlet.ServletUtilities;9 ImportOrg.jfree.data.category.CategoryDataset;Ten Importorg.jfree.data.general.DatasetUtilities; One A Public classBarChart3 { - - Public StaticString Genbarchart (HttpSession session)throwsexcepti
, when the number of I in the third i++ is 12, the calculation is added 1, that is, 10 * 11 * 12, the value of i= 12 is i++ into 13. So MUL (i++) = 10 * 11 * 12 = 1320. In addition, the operation of the ++i is similar to the above, except that it is the first to do the self-added operation, in the assignment. When i = 10, MUL (++i) is actually (++i) * (++i) * (++i) way, this time first calculation (++i), this is a calculation after the assignment
-passoword VideoLAN 192.168. 16.113 6000Another command terminal, Telnet connected to the VLC Telnet interface just opened1[Email protected]1320: ~$ telnet localhost42122Trying127.0.0.1...3 Connected to localhost.4Escape character is'^]'.5VLC Media Player2.1. 6Rincewind6 Password:7 Welcome,master8>new Test VOD enabled9 NewTen> Setup Test input downloads/hotelcalifonia.flv One Setup A>Next, create a service called Test with media type VOD: New tes
Not to be continued ...
1493: [NOI2007] Necklace factory time
limit:30 Sec Memory limit:64 MBsubmit:1320 solved:576[Submit] [Status] [Discuss]
Descriptiont Company is a company specializing in the production of color beads necklace, the production of the necklace design novel, diverse styles, affordable, widely loved by young people. Recently, T Company intends to launch a self-service necklace production system, using the system cust
produce negative numbers after exchangeAnd after a couple of such exchanges, we're sure to swap the sequence in order of B's.Thus, we prove that any feasible scheme is not good enough to follow the sequence of sequences in order B, which proves that our greedy strategy is effective.It's a weird strategy--we're only thinking about B, we can get the best strategy.Visible greedy algorithm or need to feel, bold hypothesis, careful verificationInputLine 1th: 1 number N, indicating the number of task
been terminated.1313 the specified permission does not exist.1314 the customer does not retain the request permissions.1315 the name provided is not in the correct account name format.1316 the specified user already exists.1317 the specified user does not exist.1318 the specified group already exists.1319 the specified group does not exist.1320 or the specified user account is already a member of a specific group, or the specified group may not be de
Showdown,2255 Tree Recovery,2084 Game of Connections,1906 three Powers,1833 permutations,1850 Code,1562 oil deposits,1496 Word Index,1306 combinations,1125 stockbroker Grapevine,1129 Channel Allocation,1146 ID Codes,1095 Trees made to Order, find law2247 Humble Numbers,2309 BST,2346 Lucky Tickets,2370 Democracy in danger,2365 Rope,2101 Honey and Milk Land2028 when Can We Meet?,2084 Game of Connections,1915 Knight Moves,1922 Ride to School,1941 The Sierpinski Fractal,1953 World Cup Noise,1958 St
We talked about the 1.0 version of Read-in optimization, which is GetChar () read-in.We found that GetChar () read in is very fast, but still will time out, how to do?Then optimize it again! GetChar () is still not fast enough!One of the God Bulls provides a very simple codeChar b[1],*s=b,*t=B; Char getchar2 () { return s==t (t= (s=b) +fread (B,1,115 , stdin), s==t)? 0:* s++;}This is the code that looks good on the big.Measured speed: Fzyzoj 1320:
,1915 knight moves,1922 ride to school,1941 the Sierpinski fractal,1953 World Cup noise,1958 strange towers of Hanoi,1969 count on Canton,1806 Manhattan 2025,1809 regetni,1844 sum,1870 bee breeding,1702 EVA \'s balance,1728 a flea on a chessboard,1604 just the facts,1642 stacking cubes,1656 counting Black,1657 distance on chessboard,1662 coins,1663 number steps,1313 Booklet Printing,1316 self numbers,1320 street numbers,1323 game prediction,1338 uugly
. Therefore, the larger the α value, the more elements in the input table, the higher the possibility of conflict. The smaller the α value, if the number of elements in the table is small, the possibility of conflict is smaller.
In fact, the average search length of the hash list is the function of filling factor α, but different methods of dealing with conflicts have different functions.
After learning about the basic definition of hash, we can't help but mention some famous hash algorithms. MD
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