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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

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

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

1. Image loading effect. Browsers choose different rendering algorithms based on different images.1.1 wavelet algorithm: First blur and then clear. This loading method is faster and improves rendering performance. The disadvantage is that more memory is consumed. If it is a large size picture, you can use this method.Export images from PSD, stored as Web format, JPEG tick continuous, PNG tick interleaved, so the exported image is from blur to clear.1.

so on, are suitable for this technology. 7, compressed JavaScript Compress and minimize your JavaScript files. Online compression address: http://dean.edwards.name/packer/ Before compressing, please ensure that your code is normative, otherwise it may fail, resulting in a JS error. jquery Performance Tuning Guide (2) This conclud

Improve PHP performance by caching database results (2 ). Now you can create a notification handler that sends a change notification to the client using the sendNotification process described above. Let's take a look at the "list Create a notification handler Now you can create a notification handler, which will use the sendNotification The process sends a change notification to the client. Let's take a lo

Configuration:Minheapfreeratio = 40Maxheapfreeratio = 70Maxheapsize = 1342177280 (1280.0MB)NewSize = 134217728 (128.0MB)Maxnewsize = 134217728 (128.0MB)Oldsize = 402653184 (384.0MB)Newratio = 15Survivorratio = 1024PermSize = 100663296 (96.0MB)MaxPermSize = 100663296 (96.0MB)Heap Usage:New Generation (Eden + 1 Survivor Space):Capacity = 134152192 (127.9375MB)used = 22525464 (21.481956481933594MB)Free = 111626728 (106.4555435180664MB)16.790977220856742% usedEden Space:Capacity = 134086656 (127.87

MySQL Study Notes (iv) Performance Optimization 21. Efficient Model Design (1) moderately redundant queries to minimize join Take out some data from other tables and put it in your own table. For example, in the publishing information table, not only the user ID is saved, but also a nickname is saved. (2) Vertical Split of large fields Split the field into another table, such as some large fields,Art

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

Performance Optimization --. NET (C #) calls webService to obtain the region of the Client IP address (asynchronous callback) (2 ), My friends shared this time that asynchronous callback is not an asynchronous call! Please note! Function Description,Interface address,Method NameAndParameter description. Same Article:. NET (C #) Call webService to obtain the region of the Client IP address (non-asynchronous)

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IIS6.0 Application pool recycling and worker processes A company's web site program after a long run, slow speed, restart the site after the speed significantly faster, estimated that the Web site program occupied by the memory and CPU resources can not be released in time, only need to restart the site every time the release of resources. But manual restart is not the solution to the problem, how to achieve automatic management? The IIS6.0 application pool Automatic recycle feature solves this

';+------+--------+---------+------------+------+----------------+-------------+-----------------+-------------- +-----------+----------------+---------------------+---------------------+------------+-----------------+------ ----+----------------+---------+|Name|Engine|Version|Row_format|Rows|Avg_row_length|Data_length|Max_data_length|Index_length|Data_free|Auto_increment|Create_time|Update_time|Check_time|Collation|Checksum|Create_options|Comment|+------+--------+---------+------------+------+-

On the morning of the 5 th, the IE Development Team released the new version of the Internet Explorer 9 Platform Preview version 2 promised previously. Because many features of IE9 are not yet finalized, the name of "Platform Preview version" indicates that this version is only intended for Web developers) to demonstrate new IE improvements in speed, HTML5, and graphic rendering, it does not contain complete browser functions, nor does it explain w

column reference '*' is a convenient method. unfortunately, this is a very inefficient method. in fact, Oracle converts '*' into all column names in sequence during parsing.WorkIt is done by querying the data dictionary, which means it takes more time.　　7. reduce accessDatabaseNumber of timesWhen each SQL statement is executed, Oracle performs a lot of internal work: parsing SQL statements, estimating index utilization, binding variables, and reading data blocks. it can be seen that reducing th

segments and determine their data segment fragments. If a segment contains too many fragments, you can use either of the following methods:1. Create a new table with the correct storage parameters, insert the data of the old table into the new table, and delete the old table;2. Use the Export/Import tool. Example: exp system/manager file = exp. dmpcompress = Y grants = Y indexes = YTables = (T1, T2)If the output is successful, go to Oracle and delete

'*' in the clause '*' When you want to list all columns in the SELECT clause, using dynamic SQL COLUMN reference '*' is a convenient method. unfortunately, this is a very inefficient method. in fact, ORACLE converts '*' into all column names in sequence during parsing. This task is done by querying the data dictionary, which means it takes more time. 7.Reduce the number of database accesses When each SQL statement is executed, ORACLE performs a lot of internal work: parsing SQL statements, es

browsers have a maximum cache size, and when the cache reaches that size, the least recently used items are removed from the cache, so cache entries that have not been used for long periods of time will be erased and we should keep the items more frequent.Therefore, clearing the cache is based on user behavior and there is no reliable prediction. If the cache header is not considered, the browser may store what you do not want to save in the cache, without saving what you want.As a result, deve