exist can return different results.Second, read command 1, getThe key of the GET command can represent one or more keys, separated by a space2, getsAs you can see, the GET command returns a number (medium 13) More than the normal gets command. This number checks to see if the data has changed. When the data corresponding to the key changes, the number returned will also change.3. CAsCAS is the meaning of checked and set, which can only be stored if the last parameter matches the parameters obta
exist can return different results.Second, read command 1, getThe key of the GET command can represent one or more keys, separated by a space2, getsAs you can see, the GET command returns a number (medium 13) More than the normal gets command. This number checks to see if the data has changed. When the data corresponding to the key changes, the number returned will also change.3. CAsCAS is the meaning of checked and set, which can only be stored if the last parameter matches the parameters obta
Shanghai End get-i-
fine
value-0 8
Shanghai
value fine 0 5
Gets is a command that is used with CAs, gets returns an additional CAS value that can be understood as a version; If the CAS value changes after the last gets, the value of the CAS setting is not stored; Gets key
Gets Key1 Key2
Gets
0 8
Shanghai end
set 0 0 7
Chengdu
STORED
CAs a 0 0 7 //Since the gets was set, the CAS ID changed and CAS failed
Chengdu
EXISTS
The delete command deletes a key/value pair, o
://pan.baidu.com/s/1gfOMtKB Password: zl9o Global log 127.0.0.1 local2//Log definition level Chroot/var/lib/haproxy//Current working directory Pidfile /VAR/RUN/HAPROXY.PID//Process ID maxconn 4000//Maximum number of connections user Haproxy User group Haproxy daemon//Background run stats socket/var/lib/haproxy/s running the change program Tats defaults mode TCP//haproxy run mode (http | TCP | Health) Log global option Dontlognul
depend on the recovery model of the database.
Let's take a look at the examples below:
--Paragraph restore: the database is corrupted in scope, and we have to restore the entire database across multiple data files and even across filegroups. -At this point, if the database is particularly large, the database recovery time will be very long.
However, we can use the paragraph restore provided by SQL Server to recover the database gradually. --First back up the tail log: Backup log [Adventur
very good coordination to achieve some good application. For example, through the Regionprops function to determine the characteristics of each block (such as center, area, etc.) STATS = Regionprops (l,properties) measures a set of properties for each labeled RE Gion in the label Matrix L.
2, Regionprops:
The purpose is get the properties of region, the function used to measure the properties of the image region.
Syntax:
a syntax similar to the SET command, but includes an extra value: The extra value returned by the gets.
Note the following interactions that use the CAS command:
Set userId 0 0 5
55555
STORED
gets userId
6
55555
END
6
33333
STORED
As you can see, I call the gets command with an extra integer value 6来, and the operation runs in a very sequential order. Now let's take a look at the series of commands in Listing 7:
Listing 7. CAS commands with older version indicators
. extname ('/a/B. c/.'); // =>''
Path. extname ('/a/B. c/d.'); // => '.'
(2) File Processing
Var fs = require ('fs ');
1. Determine whether the file exists
Fs. exists (path, function (exists ){});
The above interface is asynchronous, so there is a callback function that can process our various operations in the callback. If you need synchronous operations, you can use the following method:
Fs. existsSync (path );
2. Read File status information
fs.stat(path, function(err,
displayed after haproxy is started, this is the same as the "-q" parameter added when the command line starts haproxy # quiet # defines the location where statistics are stored. stats socket/usr/local/haproxy/stats # default ults # default mode [tcp: layer 4; http: Layer 7; health: Only Return OK] mode http # inherit the global log definition output log global # log category, httplog # option httplog # If
Tags: style blog color using IO file data art--piecemeal Restore: Database corruption is relatively large, we have to restore the entire database across multiple data files or even across filegroups.--If the database is particularly large, the database recovery time will be very long. However, we can use the piecemeal restore provided by SQL Server to gradually recover the database. --back up the tail log first:BACKUP LOG [AdventureWorks] to DISK =N'D:\BACKUP_TEST\LOG_BACK_TAIL.trn' withNo_tru
. When the backend server is adjusted, the cache cannot be hit, thus affecting the system performance. Recommended Configuration Methods:
Backend
Balance uri
Hash-type consistent
Server ....
Server...
Health Check of backend servers
Check is a server parameter that enables health check on this server. Check uses its additional parameters to implement a more precise monitoring mechanism.
Inter
Rise
Fall
Configuration example:
Backend app
Balance roundrobin
Server app1 192.168.2.7: 80 maxconn
, upload.js in stats = Uploader.getstats (), is to get some information returned, in the UpdateStatus functionThe code is posted below. However, the stats object does not get the parameters returned by the server, only the basic information of the upload is returned, it is necessary to add the Postfilenames attribute in the queue function in Webuploader.js, the method part code is as follows: functionQ
Python script Performance Analysis#################### Python script Performance Analysis###################CProfile/profile/hotshot is used to collect statistics on the execution frequency and time consumption of each part of the Python script. pstats can be used to format the statistics.CProfile is a C extension with low overhead. It is suitable for analyzing long-running Python programs. This module is recommended.Profile, pure Python module, with significant overhead, but it is relatively ea
Decr
Decrements numerical key value by given number
DECR MyKey 5
Delete
Deletes an existing key
Delete MyKey
Flush_all
Invalidate specific items immediately
Flush_all
Invalidate all items in n seconds
Flush_all 900
Stats
Prints General Statistics
Stats
Prints Memory Statistics
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