matter how you use the command to create the lv, it is an extended DS_LVZ type LV.From the warning log of Oracle, we can see that when Oracle uses raw devices, it is recommended to set a lv without 4 K.
AIX calls this 4 K offset lvcb (logical volume control block), which occupies the first 512 bytes of 4 K. It is similar to the Oracle data file header and retains the creation time of lv, image copy information and file system mount points.
Check whether the lv has a 4 K offset in two ways.1. Ho
successfully16/04/11 22:31:34 INFO MapReduce. job:counters:49File System CountersFile:number of bytes read=67File:number of bytes written=290851File:number of Read operations=0File:number of Large Read operations=0File:number of Write Operations=0Hdfs:number of bytes read=237Hdfs:number of bytes Written=25Hdfs:number of Read operations=9Hdfs:number of Large Read operations=0Hdfs:number of Write operations=2Job CountersLaunched Map tasks=2launched reduce Tasks=1Data-local Map tasks=2Total time s
job_1417519292729_0030 running in Uber mode:false14/12/0600:10:43 INFO MapReduce. Job:map 0% reduce 0%14/12/0600:10:49 INFO mapreduce. Job:map 100% reduce 0%14/12/0600:10:56 INFO mapreduce. Job:map 100% reduce 100%14/12/0600:10:56 INFO MapReduce. Job:job job_1417519292729_0030 completed successfully14/12/0600:10:56 INFO mapreduce. Job:counters:49filesystemcountersfile:number of bytes Read=54file:number of bytes Written=182573file:number of Read Operations=0file:number of large read operations=0
the following figure, 13 logical volumes (raw devices) in the volume group are not used. (if no logical volumes in the closed/syncd status are displayed, go to step 1) but how can we know how large these 13 logical volumes are? You can use the following command:
# Lslv lvdata0315
Logical volume: lvdata0309 volume group: datavg09
LV identifier: 0037de1d4154c0000000105cd3b6816. 11 permission: read/write
VG state: active/complete LV state: Opened/syncd
Type: Raw write verify: Off
Max LPS: 512 pp s
, can improve efficiency. If you set this value to a larger value, the younger generation object will replicate multiple times in the Survivor area, which increases the lifetime of the object's younger generations, increasing the probability of being recycled in the younger generation. This parameter is valid only when the serial GC is in effect. -xx:+aggressiveopts faster compilation Performance improvement of-xx:+usebiasedlocking lock mechanism -XNOCLASSGC Disabling garbage collection
on an existing file on disk.1 using System;2 using System.IO;3 using System.IO.MemoryMappedFiles;4 using System.Runtime.InteropServices;56 Class Program7 {8 static void Main (string[] args)9 {Ten long offset = 0x10000000; MegabytesOne long length = 0x20000000; Megabytes12//Create the memory-mapped file.using (var mmf = Memorymappedfile.createfromfile (@ "C:\ExtremelyLargeImage.data", FileMode.Open, "ImgA")15 {+//Create a random access view, from the 256th m
Dfs:number of bytes Written=15671hdfs:number of read Operations=6hdfs:number of large read operations=0hdfs:number of Write Operations=2job Counters launched map tasks=1launched reduce tasks=1data-local map tasks=1total time spent by all MA PS in occupied slots (ms) =9860total time spent by all reduces in occupied slots (ms) =2053total time spent by all map tasks (ms) =2465total time spent by all reduce tasks (ms) =2053total Vcore-seconds taken by all map Tasks=2465total vcore-seconds Taken b
content source : khanacademy-internet101-wires, cables, and WiFi(the original video and subtitles in English, the following Chinese content for personal understanding after the translation, for reference only)1. Related nouns :High trafficHigh FlowFibre-opticFiberAntennaAntennaSphericalSphere of Bandwidth BandwidthTransmission capacity, measured by bitrate transmission capacity, measured in bitrate bitrate ratio/bit rate/bitrateThe number of bits per second a system can transmit one bit per
, which takes any input, can produce a specific size output. The process of using a hash function and then producing some data, which we call hashing (hashing) or transliteration as a hashing method. And the output of the hash function, we call it a hash (hash). The basic characteristic of a particular hash function is the size of its output. For example in this article, we use a hash function that outputs output as a zero bits (32 bytes). Of course there are hash functions that produce smaller
. Job:map 100% Reduce 100%14/07/09 14:51:15 INFO MapReduce. Job:job JOB_1404888618764_0001 completed successfully14/07/09 14:51:16 INFO MapReduce. job:counters:49File System CountersFile:number of bytes read=94File:number of bytes written=185387File:number of Read operations=0File:number of Large Read operations=0File:number of Write Operations=0Hdfs:number of bytes read=1051Hdfs:number of bytes written=43Hdfs:number of Read operations=6Hdfs:number of Large Read operations=0Hdfs:number of Write
Tags: http io ar os using SP strong on fileOriginal address: Http://msdn.microsoft.com/zh-cn/library/ms190969.aspxThe basic unit of data storage in SQL Server is the page. The disk space allocated for the data file (. mdf or. ndf) in the database can be logically divided into pages (numbered 0 through n consecutively). Disk I/O operations are performed at the page level. In other words, SQL Server reads or writes all data pages. A zone is a collection of eight physically contiguous pages that ar
38-1, "STORAGE Clause that specifies STORAGE Limits"
Example 38-2, "STORAGE Clause, specifies STORAGE Limits for the gkfx temporary tablespace only"
Example 38-3, "STORAGE Clause that specifies Unlimited STORAGE"
Example 38-1 STORAGE Clause that specifies STORAGE LimitsThis clause specifies, the storage used by all tablespaces, belong to the STORAGE PDB must not exceed 2 gigabytes. I T also specifies that the storage used by the PDB sessions in the GKFX temporary tablespace must no
of bytes written=66 4972 File:numberof read operations=0 File:number of large read operations=0 File:number of write operations=0 HDFS: Number of bytes read=636501 hdfs:number of bytes written=68 hdfs:number of Read operations=9 HDFS: Number of large read operations=0 Hdfs:number of write operations=2 Job Counters launched map tasks=2 Launched reduce Tasks=1 data-local map tasks=2 Total time spent by all maps in occupied slots (ms) =12 584 total time spent by all reduces in occu
To manually read and write JSON objects, JSON. NET provides two abstract classes, jsonreader and jsonwriter, and their corresponding Derived classes:
1. jsontextreader and jsontextwriter
Jsontextwriter is used to read and write the text of a json object. It has a large number of settings to control the JSON object format.
Test:
// Write operation
stringbuilder sb = new stringbuilder (); stringwriter Sw = new stringwriter (SB); using (jsonwriter = new jsontextwriter (SW) {
Jsonwriter.
simple, look at the Fan Power Supply interface on the line-4 pin table support. (Unless it is a false four-wire, the two boxes are all four-wire, but it is not temperature controlled, pay attention to the distinction; then it is the motherboard of the gigabyte am3 interface, 760, 780, 770,880 and so on all am3 interface gigabyte motherboard, even if the fan is 3 P, still support speed control. It has a tem
A read example provided by an open source projectusingSystem;usingSystem.Collections.Generic;usingSystem.IO;usingSystem.Linq;usingSystem.Text;namespacenewtonsoft.json.tests.documentation.samples.json{ Public classReadjsonwithjsontextreader { Public voidExample () {#regionUsagestringJSON =@"{' CPU ': ' Intel ', ' PSU ': ' 500W ', ' Drives ': [' DVD read/writer '/* * (broken) * /, ' gigabyte hard drive ', ' $ gigabype hard drive '}"; JsonTextReader Read
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