calling code. Sometimes to achieve these two purposes, you need to call methods (functions) that do not return any data, respectively, to call methods (subroutines) and return values. But in Python, you don't have to worry about these semantic issues, because by using the return statement, you can achieve these two goals in almost the same way (see Listing 4).Listing 4. Returns a value in a function
>>> def stats (data):
... sum = 0.0 ...
parameters.
[Root @ xxx-MIGPC-DB uploads] # dstat -- help
Usage: dstat [-afv] [options ..] [delay [count]
Versatile tool for generating system resource statistics
Dstat options:
-C, -- cpu enable cpu stats
-C 0, 3, total include cpu0, cpu3 and total
-D, -- disk enable disk stats
-D total, hda include hda and total
-G, -- page enable page stats
-I, -- int enable
: Backend configuration: Define back-end allocation rules and interact with backend servers;Listen: Binding configuration: Binds the specified client directly to the backend-specific server;There is usually no special need, there is no need to manually debug the configuration file inside the options, most of the default values to meet our needs, and the official documentation says many options are recommended to use the default.Configuration parameters and Meanings Global configuration * Pro
The DSTAT command collects system information such as CPU, disk, NET, system, memory, process and so on, the function is stronger than Vmstat, one command can integrate uptime, Vmstat, top and other related information;Install dstat command: Yum install-y dstatExecute the dstat command to collect data from-cpu-、-disk-、-net-,-paging-、-system-by default, once a second. The default input dstat equals input dstat-cdngy 1 or dstat-a 1;If we execute the dstat 5 command, he collects the information eve
,--cpu enable CPU stats -c 0,3,total include Cpu0, CPU3 and Total -D,--disk enable disk stats -D Total,hda include HDA and total -G,--page enable page stats -I,--int enable interrupt stats -I 5,eth2 include int5 and interrupt used by eth2 -L,--load enable load stats -M,--mem
-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=--=-=-=-=-=-=-=-=-=-Dstat--help Help DescriptionVersatile tool for generating system resource statisticsDstat options:-C,--cpu enable CPU stats-c 0,3,total include Cpu0, CPU3 and Total-D,--disk enable disk stats-D Total,hda include HDA and total-G,--page enable page stats-I,--int enable interrupt
Implementation of SQL Server native data from XML to generate JSON data instance code, xmljson
Example code for generating JSON data from XML with SQL Server native data
SQL Server is a relational database, and the query results are usually datasets. However, in some special situations, we need XML data. In the past few years, JSON has been used as a common data interchange format for webapis, how does the database generate JSON data? Today I wrote a DEMO.
1. Create tables and test data
SET NOCO
provide and OpenFlow protocol, topology and other related information query and configuration, the results of the query returned to the browser in JSON format, and the configuration will call related functions of the relevant modules, you can simply see the code to get the switch in the SDN network. The command to get switches is: http://ip:port/stats/switches, which first resolves the HTTP request (GET), and the required content (switches), and then
; otherwise, no data can be received.8. Function for obtaining the NIC status
Static struct net_device_stats * loopback_get_stats (struct net_device * dev){Struct net_device_stats * stats = dev-> stats;
Stats-> rx_packets = packets;Stats-> tx_packets = packets;Stats-> rx_by
root. If you ' re trying to do them using and you'll need to change the sudo syntax slightly to something like these:$ sudo sh -c ‘echo 1 >/proc/sys/vm/drop_caches‘$ sudo sh -c ‘echo 2 >/proc/sys/vm/drop_caches‘$ sudo sh -c ‘echo 3 >/proc/sys/vm/drop_caches‘Note: There's a more esoteric version of the above command if you ' re to that:$ echo "echo 1 > /proc/sys/vm/drop_caches" | sudo shWhy the syntax? The program /bin/echo is running as root, because sudo of, and the shell that ' s redirecting
monitoring, the report output is 3 seconds apart, and the report outputs 10 results, you can run the following command:There are many parameters available in the Dstat command, which you can view with the Man Dstat command, and most of the commonly used parameters are:Versatile tool for generating system resource Statisticsdstat options:-C,--cpu enable CPU stats-c 0,3 , total include cpu0, CPU3 and total-d,--disk enable disk
length
#前置追加key中的value值, successfully returned stored, failed to return not_stored
Prepend MyKey 0 60 5
INCR Key num
#给key中的value增加num. If the key is not a number, NUM will be used to replace the value. Returns the added value
Incre MyKey 1
Decr
#同上
Ditto
Delete key [Key2 ...]
Delete one or more key-value. Successful delete returns deleted, no failure is returned not_found
Delete MyKey
Flush_all [Tim
backup back to DISK = N (TestDB)‘F:\SQLTEST\TestDB.bak‘With noformat,noinit, NAME = N‘testdb-Full Database backup', SKIP, Norewind, nounload, STATS =10go--Second emulated incremental backup DATABASE [TestDB] to DISK = N‘F:\SQLTEST\TestDBUpdate.trn‘With differential, Noformat, noinit, NAME = N‘testdb-Differential Database backup', SKIP, Norewind, nounload, STATS =10go--Third transaction log backups backup l
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