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Parallel recovery of large oracle transactions leads to database performance degradation-high cpu usage The rollback of a large transaction has a very high cost, not only locking the required resources And the CPU and IO consumption, especially IO, will be extremely intensive. At this time, we hope to reduce the number of rollback results. . It is impossible to stop. To maintain Database Consistency, rollback must be completed, so only Can reduce the

In C ++, the STL container type is used as a function and does not use references, which leads to a decrease in program efficiency. stl containers I recently found a problem with algorithm questions: I implement an algorithm recursively, but in the TreeNode * createTree Function(Vector , Int left, int right) TreeNode * createTree (Vector , Int left, int right), The result always times out, I found some algorithms written by others on the Internet

How can I disable the P2P shared update function? After Win10 is updated, P2P sharing leads to 100% CPU usage and p2pwin10 During the use of the computer, sometimes there will be an instant high CPU usage problem, this may be due to the enabling of P2P Sharing updates, the benefits of P2P Sharing updates needless to say, it can greatly improve the efficiency of computer updates, but there is also a problem that it may cause some low-configuration com

How to import open-source projects to android, which often leads to compilation errors 1. Tip: find two V4 packages of different versions. Solution: 1) Delete the V4 package under the libs directory of the project. 2) copy the path to overwrite the V4 package copy paste of the earlier version. 650) this. length = 650; "src =" http://www.bkjia.com/uploads/allimg/131228/101Z13c2-0.jpg "title =" qqpicture 20130907141458.jpg "width =" 800 "height =" 189 "

them, IE11.0 and IE 8.0 adhere to 1, 3, respectively, the share is 25.26%, 11.71%. IE9.0 and IE10.0 's rankings changed from last month, with the former dropping 1 to 5th, the latter rising 1 to 6th.The second biggest winner is Chrome, a total of 3 editions. Among them, Chrome45.0 replaced Chrome44.0 ranked 2nd, with a share of 15.25%. While Chrome44.0 fell to the 7th, with a share of only 3.24%, the chain fell 14.39% last month, the decline is obvious.In addition, Firefox40, Safari8.0, and Mic

studentsObject-oriented for C # ==================== Helijian csdn Blog column =================　|== It Student Growth Guide Column column category folder (not regularly updated) ==|　|== C + + Classroom Online Column The course teaching link (sub-course grade) ==| |== I wrote the book-"The reverse of the university-to the positive energy of IT students" ==| ===== the runway for it novices to take off. University ===== with students to enjoy happiness and passion Copy

1.aspx page needs to be added: enableeventvalidation= "false"Example: enableeventvalidation= "false" codefile= " DefCheckDate.aspx.cs "inherits= "Webadmin_customregister_shortoverflow_defcheckdate"%>2. Post Code (example):public void Btn_excelclick (object sender, EventArgs e){if (Gdv_Sof.Rows.Count {Clientscript.registerclientscriptblock (this. GetType (), "", " ");Return}Response.clearcontent ();Response.AddHeader ("Content-disposition", "attachment; Filename=checkdate.xls ");Response.contentt

Before the company operation to the server installed the security dog software, I took over the server, also did not control it.Recently the company has a PHP mall website to go online. I'll be ready for the AB stress test in the evening.Just started to test, found Xshell and Nginx server connection disconnected, how can not even up. But other servers in the same network segment can connect normally (all servers are placed behind the same firewall and then Nat mapped out). From other node ping N

can not guarantee normal transmission. There are also the problems encountered above:Computer network use without any problems, but the speed is obviously very slow, whenever using WINSCP or putty similar remote software upload or download things, small files may not be a problem, but once a little bit larger will appear long time unresponsive but not completely disconnected.and so a small problem, but also reflects, when we because something is a headache, perhaps the opposite, from the simple

similarities, then different?1. malloc is the calling function, and new is the operator2. malloc needs to calculate the number of bytes requested and convert it to the corresponding type, while new is calculated automatically.3. malloc is unsafe, and new is secure (no compile errors when applying) such as: int p= (int) malloc (sizeof (double));4, Maolloc need library file support, function definitely need ah, and new don't need, because people are operators Ah, you think + must have library fil

Pat1087 CodeTitle Description:Indeed There is many different tourist routes from our city to Rome. You is supposed to find your clients the route with the least cost while gaining the most happiness.Input Specification:Each input file contains the one test case. The first line contains 2 positive integers N (2Output Specification:For each test case, we is supposed to find the route with the least cost. If Such a route is isn't unique, the one with the maximum happiness would be recommended. If s

Android development documentation does not recommend this way to handle configuration changes:Note:using This attribute should is avoided and used only as a last-resort. Please read handling Runtime changes for more information on how to properly handle a restart due to a configuration ch Ange.Best PracticesConsidering that rotating the screen is not the only factor that causes the activity to be destroyed, it is still recommended that the method described earlier: Persisting the activity State

of the HTML document code, the HTML attribute (attribute) in the markup of an element and the property of its corresponding DOM object are two completely different concepts. For more information on getattribute and SetAttribute, refer to the content in DOM (Core) Level 1 and Level 2. For more information about HTML Dom objects, refer to Dom (HTML) Document object Model HTML, especially 1.6.1. The contents of the property Attributes. Property Description:https://www.w3.org/TR/DOM-Level-2-HT

buckets and Conntrack_max values in the log and how much memory each trace connection consumes: that is, 304MB memory will support 1,048,576 trace connection records, Therefore, the appropriate values need to be configured according to the server's memory size. Permanently modify Ip_conntrack_max and hashsize1) Increase Ip_conntrack_max (set to 2^20, default is 2^16=65536) # vi/etc/ Sysctl.confnet.ipv4.ip_conntrack_max = 10485762) Increase hashsize (on i386 architecture, hashsize = CONNTRACK_MA

Why is PHP using the Pdo->exec () method to verify that the data exists before inserting the data with the exec () query, which leads to the subsequent EXEC () insert data failure?

, but still seems to ignore my cppflags '-std=gnu++11 ', Gradle generated by the native dynamic library is dependent on libc ++.so. Cause the following situationnative.so ==> libc++.so==> ice.soice.so ==> libgnustl_shared.soBut the actual operation, the ice.so inside the abnormal related symbols __cxa_*** chain to native.so, and __gnu_unwind*** chain to libc++.so. But not libgnustl_shared.so.In this way, in the run when the ice.so inside throws the exception into the libc++.so, which caused the

Today, under the Ubuntu14.04 a small test, that is, to modify the system file/etc/passwd user UID value, but caused the system bug, not normal use. Because modifying /etc/passwd requires root privileges, when you are ready to use the sudo command again to restore the file, error:Sudo:unknown uid 1000:who is you?After rebooting, it goes directly to the least privileged Guest account, while using the sudo command is an error:sudo:unable to the root gid:operation not permitted still cannot be resol

What to do if forced removal leads to u disk damage? When you can not safely delete a U disk could forcibly unplug the U disk? Of course not! This time if forcibly removed, it is easy to damage the computer U-port or your USB drive. If you have important information on your USB drive, it is likely to be destroyed. So what should we do? Here are a few common solutions, I hope to help. The first method (recommended for the most common method): Often

A local variable leads to a bloodbath Today received a temporary task, to troubleshoot a site's bizarre problem, is this, this site traffic is very large, on a module, the page server to send an HTTP request, read another Java Web site to provide data, after the on-line found that once there is concurrency, or more access, HTTP requests fail, and even the server cannot open any pages, but the server can be ping or ping other URLs (I don't see the re

Reprint: http://www.51blackberry.com/news/zonghe/2012-08-17/7860.html Rim Jinsongwei: BlackBerry leads the enterprise mobile keynote speech Time: 2012-08-17 13:11:17 Source: Author: BlackBerry was invited to participate in the 2012 China it value Summit, in which Jinsongwei, the China manager of LN Motion, made a speech on the theme "BlackBerry Leading enterprise Mobility", the following is the full speech