2 2 s10 performance upgrades

SQL Server query performance optimization and analysis of transactions and locks (1) Step 2: analyze the locking status using SQL statements. sys. in the sysprocesses view, find out the source of waiting for the initial lock of resources and the subsequent processes to be forced to stop. The following code is applicable to both SQLSERVER20052008 and SQLSERVER20052008. SQL server query

Public classSingleton {2 Private Static classLazyholder {3 Private Static FinalSingleton INSTANCE =NewSingleton (); 4 } 5 PrivateSingleton () {}6 Public Static FinalSingleton getinstance () {7 returnlazyholder.instance; 8 } 9}This is better than the above 1, 2, both for thread safety and to avoid the performance impact o

transferred from: http://hi.baidu.com/fsword73/item/51df1fafe6083e268919d39e Author: fsword73 Bank Conflicts is a common problem in storage access, and avoids bank Conflicts effectively improving storage access speed. The following is a description of two instances, reduction and prefix Sum. 1 use padding in reduction to avoid bank Conflicts AMD HD Readon 5870 For example, the Local Memory has 32Banks, each wavefronts has 64threads, the Bank conflicts calculation formula is Bank conflicts = STRI

"] asCompositioncontainer; UserService= Container. Getexportedvalueordefault(); RoleService= Container. Getexportedvalueordefault(); Rolemodulepermissionservice= Container. Getexportedvalueordefault(); ModuleService= Container. Getexportedvalueordefault(); Modulepermissionservice= Container. Getexportedvalueordefault(); Permissionservice= Container. Getexportedvalueordefault(); } } }Once again access to the module management can see Adminlayout time , as if time-consuming speci

, and then tested on almost the same single CPU Athlon system, like memory, but only one 7200 rpm of the Ultra I DE disk. Although the final results are not the same as the percentages obtained, the observed performance increases are consistent.For simplicity's sake, our test environment uses the TPC benchmark, which is widely used for OLTP load tests. The Quest company has a tool called Benchmark Factory that makes testing work as simple as sending e

Subsequent Android traceview usage and listview performance optimization tests (1) Last part of the previous article gave me the code for testing: if you do not see it, please first browse the previous article: Now let's verify the magic of listview. The main thing that listview needs to optimize is the getview () method, which implements the convertview Cache Optimization, the difference between using listview to reuse convertview in traceview is as

First of all, review the next article high-performance JavaScript DOM programming , mainly two point optimization, one is to minimize access to the DOM, while the operation on the ECMAScript side, the second is to cache local variables, such as length and so on, Finally, two new API Queryselector () and Queryselectorall () are introduced, which can be used boldly when making portfolio selection. This article is mainly about the most time-consuming pla

# ! /Usr/bin/Python Import Sys; Import Re; Def Getprecision (TP, TN, FP, FN ): Result = 0.0; Result = TP/(TP + FP ); Return Result; Def Getrecall (TP, TN, FP, FN ): Result = 0.0; Result = TP/(TP + FN ); Return Result; Def Getfvalue (TP, TN, FP, FN ): Result = 0.0; P = getprecision (TP, TN, FP, FN ); R = getrecall (TP, TN, FP, FN ); Result = 2 * p * r/(p + r ); Return Result; Def Getri (TP, TN, FP, FN ): Result = 0.0; Result = (T

Here is a fragment of the trace file that represents a SQL execution process, and a trace file consists of a number of such fragments:parsing in CURSOR #4 len=135 dep=1 uid=0 oct=3 lid=0 tim=777069789359 hv=1115215392 ad= ' 33 e7e384 ' Select/*+ Index (idl_char$ i_idl_char1) +*/piece#,length,piece from idl_char$ where Obj#=:1 and Part=:2 and Versio N=:3 ORDER by Piece#end of Stmtparse #4: c=0,e=12,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=777069789357--b

Chapter IIData accessLiteral:Represents itself without a specific location: string number bool Object Array function Regular expressionLocal variables:VarArray:Stored inside the JS array object, indexed by numbersObject MembersStored inside the JS object as a string index There are four basic data access locations in javascript: direct volume, variable, array element (indexed by number), object member (with character bed as index) Each JS function represents an object, which is a real c

Previous Text Example, This article continues to describe the second handshake process as follows: 1. Receive packet processing, such: 1. Read the request data as follows: (1) uint8 marker = packet. read8 (); where Marker = 0x0b indicates the session startup process. (2) uint16 time = packet. read16 (); (3) uint8 id = packet. read8 (); (4) uint16 size = packet. read16 (); Note: The id value read here is id = 0x38, indicating initiator initial keying

", 60*24* (sysdate-ses.logon_time) "Minutes"From v$session ses, V$sesstat STAWHERE ses.status = ' ACTIVE 'and Sta.sid = Ses.sidand sta.statistic# in (9,40)GROUP by Ses.sid, Ses.action, Ses.logon_timeORDER bySUM (DECODE (Sta.statistic#,40,100*sta.value,sta.value))/Greatest (3600*24* (Sysdate-ses.logon_time), 1) DESC;SID User Log io/s Phy io/s Minutes----- ------ -------- -------- -------1951 Batch 291 257.3 1470 Online 6,161 62.9 0730 Batch 7,568 43.2 1972153 Online 1,482 98.9 102386 Batch 7,620

How to Enhance ASP program performance (2) 2000-08-11 · Compiling: Gan Ganping · Yesky Tip 6: Use session objects wisely Sessions have several drawbacks when they are used on a busy site. Busy means: Hundreds of pages are requested per second on the site, or thousands of users are being accessed at the same time. This technique is important for sites that require horizontal scaling: They use multiple server

How to Enhance ASP program performance (2) 2000-08-11 · Compiling: Gan Ganping · Yesky Tip 6: Use session objects wisely Sessions have several drawbacks when they are used on a busy site. Busy means: Hundreds of pages are requested per second on the site, or thousands of users are being accessed at the same time. This technique is important for sites that require horizontal scaling: They use multiple server

Article Title: using Oracle storage to analyze Unix system performance (2 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 4. Create the get_vmstat.ksh script The script is used to regularly execute the vmstat command and save the result to the database. # Get_vmstat.k

code snippets demonstrate how to convert a serial program into a Data Parallel streaming program. The first example demonstrates loop through an array (for example, pixels in an image) on a serial processor ). Note that the commands in the loop body only act on one data element at a time: for (I = 0; I 33.2 GPU Memory ModelCompared with the main memory, cache, and registers of the serial microprocessor, the graphics processor has its own memory architecture. However, this memory architecture is

To create a notification handler You can now create a notification handler, which will be aided by the sendnotification described above Procedure sends a change notification to the client. Take a look at the Pl/sql process orders_nf_callback in Listing 2. Listing 2.Processing to OE. Notification handlers for notifications of changes made to the ORDERS table CREATE OR REPLACE PROCEDURE orders_nf_callback

I. Nginx optimal configuration 1. master Configuration file Optimization: # vi/usr/local/nginx/conf/nginx.conf ----------------------------------------- User Nginx Nginx; Worker_processes 8; Worker_cpu_affinity 00000001 00000010 00000100 00001000 00010000 00100000 01000000; Error_log/usr/local/nginx/logs/nginx_error.log Crit; Pid/usr/local/nginx/logs/nginx.pid; Worker_rlimit_nofile 204800; Events { Use Epoll; Worker_connections 204800; } HTTP { Include Mime.types; Default_type

Oracle SQL Performance Optimization: 2. When a user establishes a connection with the database, an operation request is sent to the database, that is to say, send the previous SQL statement (or several or one PL/SQL package) to the database. After Oracle receives the SQL statement, it first performs a Hash function operation to obtain a Hash value, and then searches for the existence of the SQL statement th

Relationship between ASH and AWR. Based on the V $ SESSION, ASH samples the event every second and records the event waiting for the Active SESSION. Non-active sessions are not sampled, and the sampling is completed by the newly introduced background process MMNL.The ASH memory record data is always limited. In order to save historical data, the Automatic load information library (AWR) is introduced and completed by the background process MMON. ASH information is also collected and written into