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client and convince them to set aside funds for hardware capacity planning. Budgeting for capacity planning can is much more cost effective than buy-ing more hardware than you need. In this case, horizontal scalability are the key-adding hardware as needed rather than overbuying in the beginning. To make a horizontal strategy work, software architects need to constantly measure capacity and isolate software component S to execute in performance-predictable environments.Hardware capacity plannin
-characters-in-python gave the answer to a question in stackoverflow. When you print foo, what gets printed out is str(foo).However, if foo is a list, str(foo) uses repr(bar) for each element bar, not str(bar). Of course, this issue has long been discovered. In PEP3140 str (container) shocould call str (item), not repr (item), in this proposal, we recommend that you use _ str _ instead of _ repr _ when printing the container __. But Guido (father of Python) relentlessly refused because: Guido sa
Python reads and writes json files, JSON (JavaScript Object Notation) is a lightweight data exchange format. It is based on a subset of ECMAScript. JSON uses a completely language-independent text format, but it also uses a habit similar to the C language family (including C, C ++, Java, JavaScript, Perl, Python, and so on ). These features make JSON an ideal data exchange language. Easy to read and write, and easy to parse and generate by machines (generally used to increase the network transmi
Two modules for serialization JSON: Used to convert between string and Python data types Pickle: Converting between Python-specific types and Python data types The JSON module provides four functions: dumps dump loads load The Pickle module provides four functions: dumps dump loads load Pickle instances: Import Pickle data = {' K1 ': 123, ' K2 ': ' Hello '} Pickle.
votedisk-lists the voting disks used by CSS Crsctl add css votedisk Crsctl delete css votedisk Crsctl enable crs-enables startup for all CRS daemons Crsctl disable crs-disables startup for all CRS daemons Crsctl start crs-starts all CRS daemons. Crsctl stop crs-stops all CRS daemons. Stops CRS resources in case of cluster. Crsctl start resources-starts CRS resources. Crsctl stop resources-stops CRS resources. Crsctl debug statedump evm-dumps state
This article describes in detail how to read and write json files using python. JSON (JavaScript Object Notation) is a lightweight data exchange format. It is based on a subset of ECMAScript. JSON uses a completely language-independent text format, but it also uses a habit similar to the C language family (including C, C ++, Java, JavaScript, Perl, Python, and so on ). These features make JSON an ideal data exchange language. Easy to read and write, and easy to parse and generate by machines (ge
administrator cannot access it. SQL> show user; User is "SYS" SQL> select count (*) from scott. emp; Select count (*) from scott. emp ORA-01031: insufficient Permissions Create a directory object and export data. [Oracle @ SimpleLinux ~] $ Cd/dumps/ [Oracle @ SimpleLinux dumps] $ ls-l Total 0 Create directory object dumps in Oracle. Try to export.
Sys module and serialization module (instance description) of the python module, and python serialization Sys module The sys module is an interface for interacting with the python interpreter. Sys. argv command line parameter List. The first element is the program path sys. exit (n) exit the program. exit (0) when the program Exits normally and exit sys by mistake. exit (1) sys. obtain the version information of the Python interpreter sys. path: return the search path of the module. during initi
Execute command:$ PHP Bin/consoleCheck the command.Symfony version 3.1.5-app/dev/debugusage:command [options] [arguments]options:-H,--help Display this hel P message-q,--quiet do not output no message-v,--version Display This application version-- ANSI Force ANSI output--NO-ANSI Disable ANSI Output-n,--no-interaction don't ask any Interac tive question-e,--env=env the environment name. [Default: "Dev"]--no-debug switches off debug mode. -V|VV|VVV,--verbose increase the verbosity of messages:1 f
processes on the current terminal. It is a badIdea to do this on a console where X is running as the GUI will stopAnd you can't see what you type, so you will need to switch to a ttyAfter doing the magic sysrq. L-Sends sigkill to all processes, including init. This means thatEveryProcess including init will be killed, using this keyWillRender your system non-functional and no further magicsysrq keys can be used. So in this case you will have to cold reboot it. M-
crsctl enable CRS-enables startup for all CRS daemons crsctl disable CRS-disables startup for all CRS daemons crsctl start CRS-starts all CRS daemons. crsctl stop CRS-stops all CRS daemons. stops CRS resources in case of cluster. crsctl start resources-starts CRS resources. crsctl stop resources-stops CRS resources. crsctl debug statedump EVM-dumps state info for EVM objects crsctl debug statedump CRS-dumps
use pickle to serialize an object and then use cPickle for deserialization. At the same time, these two modules will become more "smart" when processing the self-reference type, and it will not recursively serialize the self-reference object without restrictions, for multiple references of the same object, it will be serialized only once. For example: ? 1 2 3 4 5 6 7 8 Import marshal, pickle List = [1] List. append (list) Byt1 = marshal.
Example of using the Data Object Persistence storage module pickle in Python, pythonpickle In Python, you can use the pickle module to convert an object into a file and save it on a disk. You can then read and restore the object as needed. The usage is as follows:Pickle is a common serialization tool in the Python library. It can export memory objects as strings in text or binary format, or write them into documents. In the future, you can restore it to a memory object from a character or docume
2.3.2 adplus, a convenient tool for capturing dump As mentioned above, the dump file can save the Process status for easy analysis. Because the dump file records the specific information of a process at a certain time point, it is very important to save the dump. For exampleProgramCrash: dump should be obtained when the command that causes the crash is executed (that is, when the 1st chance exception occurs), so that the direct cause of the problem can be seen during dump analysis. Adplus is
Android official blog-memory Analysis of Android applications) By Tim Bray The Dalvik Virtual Machine supports garbage collection, but this does not mean you don't have to worry about memory management. Pay special attention to the memory usage of mobile devices. The memory space on the mobile devices is limited. In this article, let's take a look at how some of the memory profiling tools in the android SDK help us trim the memory usage of the application. Some memory usage problems are obviou
Jhat is the Java Heap analysis tool (Java heap analyzes Tool). Become standard after the JDK6U7. Using this command requires some Java development experience, and the official does not provide technical support and customer service for this tool. Usage: jhat [Options] Heap-dump-file Parameters: Options optional command line parameters, refer to the options below Heap-dump-file The binary Java heap dump file to view (Java binary heap dump file). If a dump file contains multiple copies of heap
The Dalvik Virtual Machine supports garbage collection, but this does not mean you don't have to worry about memory management. Pay special attention to the memory usage of mobile devices. The memory space on the mobile devices is limited. In this article, let's take a look at how some of the memory profiling tools in the android SDK help us trim the memory usage of the application. Some memory usage problems are obvious. For example, if the app has a memory leak every time the user touches the
heap dumps. What type of allocation will happen in a given period of time, but it will not give us all the status information about the application heap. for more information about allocation traker, see http://developer.android.com/resources/articles/track-mem.html. we will put the focal point on heap dumps, which is a more powerful memory analysis tool. A heap dumps
During Dalvik running, programmers cannot explicitly allocate and release the memory, so the memory leakage here is different from that in C and C ++. In your code, memory leakage is a reference to a class object that you no longer need. Sometimes a single reference will impede GC's collection of a large number of objects. Necessary tools: The android SDK provides two main tools for analyzing the memory usage of applications: Allocation tracker and heap dump
This article explains the steps to analyze IBM Lotus Notes and Domino hangs and crashes using the Lotus Notes diagnostic (LND) tool, a process that is alsoUseful for analyzing the files in the IBM technical support folder. Showtable of contentshidetable OF CONTENTS 1 Overview 2 downloading and installing the LND Tool 3 using the tool 3.1 processing a semaphore File 3.2 processing a memory dump file 3.3 processing a dxl File 4 C
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