Category Archives: How to Fix

How to remove the title bar (using the request window feature)（ Window.FEATURE_ NO_ Title); why it fails)

The method to remove the title bar (use requestWindowFeature(window.feature_no_title); Why does it fail?
Use RequestWindowFeature (window.feature_no_title) to hide the cause of the failure of the title bar, possibly because the activity inherits from AppCompatActivity. The use method is described in detail below:
A, if you create the activity inherited activity:
the first one: introduction to often use a method:

requestWindowFeature(Window.FEATURE_NO_TITLE);

//remove the title bar of note that this sentence must be written in the book of the setContentView () method, in front of or complains
the second: in the AndroidManifest. Defined in the XML file

<application android:theme="@android:style/Theme.NoTitleBar">

Wrote, then the application will remove the title bar, if just want to get rid of a certain Activity of the title bar, you can add this property to the Activity inside the tag
the third: this is not commonly used in general application, is in the res/values below to create a new style. The XML file
code is as follows:
duplicate code

<?xml version="1.0" encoding="UTF-8" ?>
<resources>
    <style name="notitle">
        <item name="android:windowNoTitle">
            true
        </item>
    </style>
</resources>

Copying code
in this way, we can customize a style, is equivalent to a topic, and then in the AndroidManifest. Defined in the XML file, also can achieve the effect of removing the title bar
code is as follows:

<application 
    android:icon="@drawable/icon" 
    android:label="@string/app_name" 
    android:theme="@style/notitle">

AppCompatActivity>

getSupportActionBar().hide();
//Remove the title bar Note that this sentence must be written after the setContentView() method

Second: You can do the following in AndroidManifest.xml, so there is no title bar

<application
   android:theme="@style/Theme.AppCompat.NoActionBar">

[Go] Provide http service with two requests and process favicon.ico

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When the http package is used, the mode processing of /this root path is registered, and the browser will automatically request favicon.ico. Be careful to handle it, otherwise there will be two requests

func main() {
    log.Println( " listen on 8080...\r\ nAccess : http://127.0.0.1:8080 " )
     // root path 
    http.HandleFunc( " / " , index)
        http.ListenAndServe( " :8080 " , nil)
}

// Home page jump 
func index(w http.ResponseWriter, r * http.Request) {
     if r.URL.RequestURI() == " /favicon.ico " {
         return
    }
}

[TCP] TCP connection SYN timeout retransmission times and timeout period

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When tcp performs a three-way handshake, the first step is that the client sends a syn request, the server returns syn+sck, and the client responds to sck

When the syn request times out, tcp will timeout retransmission, and the number of retransmissions can be viewed here cat /proc/sys/net/ipv4/tcp_syn_retries

 

 You can see that the number of retransmissions is 6 

 

Each timeout time is 1 second, 2 seconds, 4 seconds, 8 seconds, 16 seconds, 32 seconds

Use telnet to test a non-existent ip and port 

telnet 222.222.222.222 80

 Use tcpdump to view the retransmission phenomenon

tcpdump -i any port 88

 

 It can be seen that after the first connection failed, it was retransmitted 6 times

The interval time is 1 second, 2 seconds, 4 seconds, 8 seconds, 16 seconds, 32 seconds

Solution to “[dbnetlib] [connectionwrite (send()).] general network error”

Recently, I need to use Excel to generate a series of charts, the data is naturally obtained through sql server. The problem is that this excel has nearly 50 charts, and each chart has to be connected to DB to get the data. The problem comes, when refreshing all the time often encountered
“[DBNETLIB] [ConnectionWrite (send()). General network error. Check your network documentation” error. The initial judgment is definitely too much data connection caused by (for Excel rookies do not have the ability to solve from the Excel side). After a while Google, finally found a solution, maybe not the best, right as a record.

Possible causes.
This problem occurs because Windows Server 2003 and higher implements a security feature that reduces the size of the queue of concurrent TCP/IP connections to the server. This feature helps prevent denial-of-service attacks. Under high load conditions, the TCP/IP protocol may incorrectly recognize a valid TCP/IP connection as a denial-of-service attack. This behavior can lead to the problems described in the Symptoms section.

Solution.
This section, method, or task contains steps that tell you how to modify the registry. However, serious problems can occur if the registry is not modified correctly. Therefore, make sure you follow these steps carefully. For extra protection, back up the registry before modifying it. Then, if a problem occurs, you can restore the registry.
To resolve this issue, turn off this new feature by adding SynAttackProtect entry to the following registry entry for the computer that is running Microsoft SQL Server, which houses your BizTalk server database.

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Tcpip \ \ Service Parameters

Settings

SynAttackProtect

Enter a DWORD value of 00000000. to do this, follow these steps:
Click Start, click Run, type regedit, and then click OK. Find and click on the following registry entry:

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Tcpip \ \ Service Parameters

On the Edit menu, point to New, then click on the DWORD value. Type SynAttackProtect, and then press ENTER. Click Modify on the Edit menu. In the Value Data box, type 00000000. click OK. exit the Registry Editor.
Note To complete this registry change, you must restart the computer running SQL Server.

 

Vue introduces ecarts, init initializes and reports an error

Vue introduces ecarts, init initializes and reports an error

1. Download ecarts

npm install echarts --save

2. I have only one page to refer to ecarts, so I directly introduce it into the page

import echarts from 'echarts'

3. Write corresponding examples in methods

myEcharts() {
      this.chart = echarts.init(document.getElementById('main'))

      this.chart.setOption({
        tooltip: {
          trigger: 'item',
          formatter: '{a} <br/>{b} : {c} ({d}%)'
        },
        legend: {
          bottom: 10,
          left: 'center',
          data: ['rented', 'not rented', 'booked']
        },
        series: [
          {
            name: 'Vehicle Rental Status',
            type: 'pie',
            radius: '55%',
            center: ['50%', '40%'],
            data: [
              { value: 40, name: 'rented' },
              { value: 30, name: 'not rented' },
              { value: 30, name: 'booked' }
            ],
            emphasis: {
              itemStyle: {
                shadowBlur: 10,
                shadowOffsetX: 0,
                shadowColor: 'rgba(0, 0, 0, 0.5)'
              }
            }
          }
        ]
      })
    }

4. Reference method in mounted

mounted() {
    this.myEcharts()
  }

Results an error was reported, init initialization error was reported

it took half an hour to find out the reason, because the import mode was wrong
the original import accessories from 'accessories' should be changed to Import * as accessories from' accessories' . The updated writing method in the official website. After modification, refresh the page

if ecarts is needed in many parts of the system, it can be introduced globally in main.js

import * as echarts from 'echarts'

Vue.prototype.$echarts = echarts

Declarative development tab in Vue

Tab case

First, CSS style

* {
      margin: 0;
      padding: 0;
    }

    .tab ul {
      overflow: hidden;
      padding: 0;
      margin: 0;
    }

    .tab ul li {
      box-sizing: border-box;
      padding: 0;
      float: left;
      width: 100px;
      height: 45px;
      line-height: 45px;
      list-style: none;
      text-align: center;
      border-top: 1px solid blue;
      border-right: 1px solid blue;
      cursor: default
    }

    .tab ul li:first-child {
      border-left: 1px solid blue;
    }

    .tab ul li.active {
      background-color: orange;
    }

    .tab div {
      width: 500px;
      height: 300px;
      display: none;
      text-align: center;
      font-size: 30px;
      line-height: 300px;
      border: 1px solid blue;
      border-top: 0px;
    }

    .tab div.current {
      display: block;
    }

Second, structure

<div id="app">
    <div class="tab">
      <ul>
        <li class="active">apple</li>
        <li>orange</li>
        <li>lemon</li>
      </ul>
      <div class="current">
        <img src="img/apple.png">
      </div>
      <div>
        <img src="img/orange.png">
      </div>
      <div>
        <img src="img/lemon.png">
      </div>
    </div>
  </div>

Third: JS logic

var vm = new Vue({
      el: '#app',
      data: {
      }，
    methods: {
     }
)}

The following is the result of the HTML structure and JS code

1. HTML structure

<div id="app">
    <div class="tab">
      <!--  tab  -->
      <ul>
        <!-- dynamically bound class with active class name highlighted without active not highlighted-->
        <li @click="change(index)" :class='currentIndex==index?"active":""' v-for="(item, index) in list"
          :key="item.id">
          {{item.title}}</li>
      </ul>
      <!--  Corresponding displayed images -->
      <! -- dynamically bound class with current class name shown without current hidden-->
      <div :class="currentIndex==index?'current':''" v-for="(item, index) in list" :key="item.id"><img :src="item.path">
      </div>
    </div>
  </div>

2. JS logic

let vm = new Vue({
      el: '#app',
      data: {
        currentIndex: 0,// The current index of the tab defaults to 0  
        list: [{
          id: 1,
          title: 'apple',
          path: 'img/apple.png'
        },
        {
          id: 2,
          title: 'orange',
          path: 'img/orange.png'
        },
        {
          id: 3,
          title: 'lemon',
          path: 'img/lemon.png'
        }]
      },
      methods: {
        // The currentIndex is equal to the clicked index value by passing in the index 
        // thus controlling the class name    
        change(index) {
          this.currentIndex = index
        }
      }
    })

Tab view

db2 Database Error: table space access is not allowed

One day, my development colleague told me that the database couldn’t be used and reported “table space access is not allowed”. So I logged into the server to check db2diag. Log
and found that the log stopped in the morning

[14:51:46]db2inst1@gdtmsdb:~/sqllib/db2dump> ls -l|grep db2diag
[14:51:46]-rw-rw-rw- 1 db2inst1 db2iadm1 23195331  May 12 09:37 db2diag.log
[14:51:46]-rw-rw-rw- 1 db2inst1 db2iadm1 24481792  April  7 2016 db2diag.log_2016-04-08-13.49.13
[14:51:46]-rw-rw-rw- 1 db2inst1 db2iadm1 41023003  Jun  2 2017 db2diag.log_2017-06-02-10.27.09
[14:51:46]-rw-rw-rw- 1 db2inst1 db2iadm1 53019005  April  8 2019 db2diag.log_2019-04-09-07.10.34
[14:51:46]-rw-rw-rw- 1 db2inst1 db2iadm1    85065  April  9 2019 db2diag.log_2019-04-09-07.27.43
[14:51:46]-rw-rw-rw- 1 db2inst1 db2iadm1    63379  April  9 2019 db2diag.log_2019-04-09-07.33.49

2.Db2top – D tmsdb view the database table space

you can see that four file spaces are offline<Second, view the log information

[14:51:55]db2inst1@gdtmsdb:~/sqllib/db2dump> tail -n 1000 db2diag.log|more
14:52:07]2021-05-12-08.55.52.809736+480 E23154237E1192        LEVEL: Error (OS)
[14:52:07]PID     : 19571                TID : 47162285090560  PROC : db2sysc 0
[14:52:07]INSTANCE: db2inst1             NODE : 000            DB   : TMSDB
[14:52:07]APPHDL  : 0-7                  APPID: M000E092.CED2.210512005537
[14:52:07]AUTHID  : TMSUSR               HOSTNAME: gdtmsdb
[14:52:07]EDUID   : 25                   EDUNAME: db2agent (TMSDB) 0
[14:52:07]FUNCTION: DB2 UDB, oper system services, sqloopenp, probe:80
[14:52:07]MESSAGE : ZRC=0x840F0001=-2079391743=SQLO_ACCD "Access Denied"
[14:52:07]          DIA8701C Access denied for resource "", operating system return code 
[14:52:07]          was "".
[14:52:07]CALLED  : OS, -, open                             OSERR: EACCES (13)
[14:52:07]DATA #1 : Codepath, 8 bytes
[14:52:07]4:11:18:20:24:40
[14:52:07]DATA #2 : File name, 13 bytes
[14:52:07]/dev/raw/raw1
[14:52:07]DATA #3 : SQO Open File Options, PD_TYPE_SQO_FILE_OPEN_OPTIONS, 4 bytes
[14:52:07]SQLO_REVISE, SQLO_READWRITE, SQLO_SHAREWRITE, SQLO_USE_RAW_DEVICE, SQLO_WRITETHRU, SQLO_NO_FLUSH_ON_CLOSE
[14:52:07]DATA #4 : Hex integer, 4 bytes
[14:52:07]0x00000180
[14:52:07]DATA #5 : signed integer, 4 bytes
[14:52:07]0
[14:52:07]DATA #6 : Hex integer, 4 bytes
[14:52:07]0x00004000
[14:52:07]DATA #7 : String, 105 bytes
[14:52:07]Search for ossError*Analysis probe point after this log entry for further
[14:52:07]self-diagnosis of this problem.
[14:52:28]
[14:52:28]2021-05-12-08.55.52.811932+480 I23155430E3586        LEVEL: Error (OS)
[14:52:28]PID     : 19571                TID : 47162285090560  PROC : db2sysc 0
[14:52:28]INSTANCE: db2inst1             NODE : 000            DB   : TMSDB
[14:52:28]APPHDL  : 0-7                  APPID: M000E092.CED2.210512005537
[14:52:28]AUTHID  : TMSUSR               HOSTNAME: gdtmsdb
[14:52:28]EDUID   : 25                   EDUNAME: db2agent (TMSDB) 0
[14:52:28]FUNCTION: DB2 Common, OSSe, ossErrorIOAnalysis, probe:100
[14:52:28]CALLED  : OS, -, open                             OSERR: EACCES (13)
[14:52:28]DATA #1 : String, 111 bytes
[14:52:28]A total of 2 analysis will be performed :
[14:52:28] - User info
[14:52:28] - Path access permission
[14:52:28]
[14:52:28] Target file = /dev/raw/raw1
[14:52:28]DATA #2 : String, 184 bytes
[14:52:28]  Real user ID of current process       = 503
[14:52:28]  Effective user ID of current process  = 503
[14:52:28]  Real group ID of current process      = 304
[14:52:28]  Effective group ID of current process = 304
[14:52:28]DATA #3 : String, 41 bytes
[14:52:28]current sbrk(0) value: 0x000000000073a000
[14:52:28]DATA #4 : String, 204 bytes
[14:52:28]Information of each subdirectory leading up to the first inaccessible one is shown in the format below :
[14:52:28]   <UID>:<GID>:<permissions> (subdirectories)
[14:52:28]
[14:52:28]   0:0:755 (dev)
[14:52:28]   0:0:755 (raw)
[14:52:28]   0:6:660 (raw1)
[14:52:28]CALLSTCK: (Static functions may not be resolved correctly, as they are resolved to the nearest symbol)
[14:52:28]  [0] 0x00002AE4BD0AF4AB /db2home/db2inst1/sqllib/lib64/libdb2osse.so.1 + 0x2244AB
[14:52:53]  [1] 0x00002AE4BD0B0A33 ossLogSysRC + 0xB3
[14:52:53]  [2] 0x00002AE4BD0A28D4 /db2home/db2inst1/sqllib/lib64/libdb2osse.so.1 + 0x2178D4
[14:52:53]  [3] 0x00002AE4BD09FB9D ossErrorAnalysis + 0x2D
[14:52:53]  [4] 0x00002AE4B7034E6C sqloSystemErrorHandler + 0x77C
[14:52:53]  [5] 0x00002AE4B50036A6 sqloopenp + 0xA36
[14:52:53]  [6] 0x00002AE4B211D6FD _Z20sqlbDMSDoContainerOpP12SQLB_POOL_CBPK9SQLP_LSN8iP16SQLB_POOLCONT_CB12SQLB_CONT_OPjS3_P12SQLB_GLOBALSb + 0x
[14:52:53]18D
[14:52:53]  [7] 0x00002AE4B2136931 _Z16sqlbDMSStartPoolP12SQLB_GLOBALSP12SQLB_POOL_CBb + 0x221
[14:52:53]  [8] 0x00002AE4B1FED9AB _Z14sqlbStartPoolsP12SQLB_GLOBALS + 0x61B
[14:52:53]  [9] 0x00002AE4B209EA56 sqlbinit + 0x1D78
[14:52:53]  [10] 0x00002AE4B4098D02 /db2home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x3247D02
[14:52:53]  [11] 0x00002AE4B409206D _ZN16sqeLocalDatabase12FirstConnectEP8SQLE_BWARcP8sqeAgentP8sqlo_gmtiiPb + 0x18FD
[14:52:53]  [12] 0x00002AE4B4080FF8 _ZN8sqeDBMgr23StartUsingLocalDatabaseEP8SQLE_BWAP8sqeAgentRccP8sqlo_gmtPb + 0x1558
[14:52:53]  [13] 0x00002AE4B403339F _ZN14sqeApplication13AppStartUsingEP8SQLE_BWAP8sqeAgentccP5sqlcaPc + 0x43F
[14:52:53]  [14] 0x00002AE4B402A19C _ZN14sqeApplication13AppLocalStartEP14db2UCinterface + 0x57C
[14:52:53]  [15] 0x00002AE4B4252310 _Z11sqlelostWrpP14db2UCinterface + 0x40
[14:52:53]  [16] 0x00002AE4B4251237 _Z14sqleUCengnInitP14db2UCinterfacet + 0x6F7
[14:52:53]  [17] 0x00002AE4B424FB08 sqleUCagentConnect + 0x4A8
[14:52:53]  [18] 0x00002AE4B4363B36 _Z18sqljsConnectAttachP13sqljsDrdaAsCbP14db2UCinterface + 0xB6
[14:52:53]  [19] 0x00002AE4B432804E _Z16sqljs_ddm_accsecP14db2UCinterfaceP13sqljDDMObject + 0x3CE
[14:52:53]  [20] 0x00002AE4B431B628 _Z17sqljsParseConnectP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UCinterface + 0x58
[14:52:53]  [21] 0x00002AE4B431BE6B _Z10sqljsParseP13sqljsDrdaAsCbP14db2UCinterfaceP8sqeAgentb + 0x36B
[14:52:53]  [22] 0x00002AE4B4316049 /db2home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x34C5049
[14:52:53]  [23] 0x00002AE4B43144DC /db2home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x34C34DC
[14:52:53]  [24] 0x00002AE4B4311519 /db2home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x34C0519
[14:52:53]  [25] 0x00002AE4B431110B _Z17sqljsDrdaAsDriverP18SQLCC_INITSTRUCT_T + 0xEB
[14:52:53]  [26] 0x00002AE4B400CC77 _ZN8sqeAgent6RunEDUEv + 0xAD7
[14:52:53]  [27] 0x00002AE4B58821F7 _ZN9sqzEDUObj9EDUDriverEv + 0xF7
[14:52:53]  [28] 0x00002AE4B5017C83 sqloEDUEntry + 0x303
[14:52:53]  [29] 0x00002AE4B0C3B806 /lib64/libpthread.so.0 + 0x7806
[14:52:53]  [30] 0x00002AE4BDE7F64D clone + 0x6D

You can see the key words [14:52:28] target file =/dev/raw/raw1. It seems that there is something wrong with this file system
check whether the device is bare or not with db2pd – D tmsdv – tab

[15:04:47]db2inst1@gdtmsdb:~> db2pd -d tmsdb -tab
[15:04:48]
[15:04:48]Database Member 0 -- Database TMSDB -- Active -- Up 0 days 04:25:13 -- Date 2021-05-12-13.20.50.628719
[15:04:48]
[15:04:48]Tablespace Configuration:
[15:04:48]Address            Id    Type Content PageSz ExtentSz Auto Prefetch BufID BufIDDisk FSC NumCntrs MaxStripe  LastConsecPg RSE  Name
[15:04:48]0x00002AEB8D5540C0 0     SMS  Regular 32768  32       Yes  192      1     1         Def 1        0          31           No   SYSCATSPACE
[15:04:48]0x00002AEB8D561260 1     SMS  SysTmp  32768  32       Yes  192      1     1         On  1        0          31           No   TEMPSPACE1
[15:04:48]0x00002AEB8D56E400 2     DMS  Large   32768  32       No   32       2     2         Def 1        0          31           Yes  EOSWFCTX
[15:04:48]0x00002AEB8D57B5A0 3     DMS  Large   32768  4        Yes  24       1     1         Def 1        0          3            Yes  SYSTOOLSPACE
[15:04:48]0x00002AEB8D588740 4     DMS  UsrTmp  32768  32       No   32       2     2         Def 1        0          31           No   TEMP32K
[15:04:48]0x00002AEB8D5958E0 5     DMS  Large   32768  32       No   32       2     2         Def 1        0          31           Yes  TMSDBUSR
[15:04:48]0x00002AEB8D5A2A80 6     DMS  Large   32768  32       No   32       3     3         Def 1        0          31           Yes  TMSDBIDX
[15:04:48]
[15:04:48]Tablespace Statistics:
[15:04:48]Address            Id    TotalPgs   UsablePgs  UsedPgs    PndFreePgs FreePgs    HWM        Max HWM    State      MinRecTime NQuiescers PathsDropped TrackmodState    
[15:04:48]0x00002AEB8D5540C0 0     5143       5143       5143       0          0          -          -          0x00000000 0          0          No           n/a              
[15:04:48]0x00002AEB8D561260 1     1          1          1          0          0          -          -          0x00000000 0          0          No           n/a              
[15:04:48]0x00002AEB8D56E400 2     163840     163808     0          0          0          0          0          0x00004000 0          0          No           n/a              
[15:04:48]0x00002AEB8D57B5A0 3     1024       1020       80         0          940        80         80         0x00000000 0          0          No           n/a              
[15:04:48]0x00002AEB8D588740 4     163840     163808     0          0          0          0          0          0x00004000 0          0          No           n/a              
[15:04:48]0x00002AEB8D5958E0 5     6553600    6553568    0          0          0          0          0          0x00004000 0          0          No           n/a              
[15:04:48]0x00002AEB8D5A2A80 6     3276800    3276768    0          0          0          0          0          0x00004000 0          0          No           n/a              
[15:04:48]
[15:04:48]Tablespace Autoresize Statistics:
[15:04:48]Address            Id    AS  AR  InitSize             IncSize              IIP MaxSize              LastResize                 LRF
[15:04:48]0x00002AEB8D5540C0 0     No  No  0                    0                    No  0                    None                       No  
[15:04:48]0x00002AEB8D561260 1     No  No  0                    0                    No  0                    None                       No  
[15:04:48]0x00002AEB8D56E400 2     No  No  0                    0                    No  0                    None                       No  
[15:04:48]0x00002AEB8D57B5A0 3     No  Yes -32768               -1                   No  None                 None                       No  
[15:04:48]0x00002AEB8D588740 4     No  No  0                    0                    No  0                    None                       No  
[15:04:48]0x00002AEB8D5958E0 5     No  No  0                    0                    No  0                    None                       No  
[15:04:48]0x00002AEB8D5A2A80 6     No  No  0                    0                    No  0                    None                       No  
[15:04:48]
[15:04:48]Tablespace Storage Statistics:
[15:04:48]Address            Id    DataTag  Rebalance SGID  SourceSGID
[15:04:48]0x00002AEB8D5540C0 0     0        No        -     -                    
[15:04:48]0x00002AEB8D561260 1     0        No        -     -                    
[15:04:48]0x00002AEB8D56E400 2     0        No        -     -                    
[15:04:48]0x00002AEB8D57B5A0 3     0        No        -     -                    
[15:04:48]0x00002AEB8D588740 4     0        No        -     -                    
[15:04:48]0x00002AEB8D5958E0 5     0        No        -     -                    
[15:04:48]0x00002AEB8D5A2A80 6     0        No        -     -                    
[15:04:48]
[15:04:48]Containers:
[15:04:48]Address            TspId ContainNum Type    TotalPgs   UseablePgs PathID     StripeSet  Container 
[15:04:48]0x00002AE4FDA42A40 0     0          Path    5143       5143       -          0          /db2data/tmsdb/db2inst1/NODE0000/SQL00001/SQLT0000.0
[15:04:48]0x00002AE4FDA3EC00 1     0          Path    1          1          -          0          /db2data/tmsdb/db2inst1/NODE0000/SQL00001/SQLT0001.0
[15:04:48]0x00002AE4FDA32C40 2     0          Disk    163840     163808     -          0          /dev/raw/raw1
[15:04:48]0x00002AE4FDA36C60 3     0          File    1024       1020       -          0          /db2data/tmsdb/db2inst1/NODE0000/SQL00001/SYSTOOLSPACE
[15:04:48]0x00002AE4FDA37C60 4     0          Disk    163840     163808     -          0          /dev/raw/raw2
[15:04:48]0x00002AE4FDA38C60 5     0          Disk    6553600    6553568    -          0          /dev/raw/raw3
[15:04:48]0x00002AE4FDA39C60 6     0          Disk    3276800    3276768    -          0          /dev/raw/raw4

You can see that four bare devices are used. Considering that the restart permission of bare devices will change, check the startup script of this machine

[15:13:00]gdtmsdb:/myscript # cat startServer.sh 
[15:13:00]chown db2inst1:db2iadm1 /dev/raw/raw1
[15:13:00]chown db2inst1:db2iadm1 /dev/raw/raw2
[15:13:00]chown db2inst1:db2iadm1 /dev/raw/raw3
[15:13:00]chown db2inst1:db2iadm1 /dev/raw/raw4
[15:13:00]
[15:13:00]su - db2inst1 -c "db2start"
[15:13:00]su - db2inst1 -c "db2 activate db tmsdb"

Power on needs to be re empowered. Check the permissions under/dev/raw, and it’s not db2inst1. Execute the self startup script written in advance, and the problem is solved.

Fatal error in CentOS: Python. H: no that file or directory

Today, when I installed the software on my virtual machine, this error occurred. After searching the Internet, I found that I wanted to install Python devel, but I found that I couldn’t solve the problem after installing according to the online command, and then I found that there was another Python 3 devel, that is, I need to install the corresponding devel according to your current version of Python in Linux, I use python3, so the corresponding installation command is:
sudo Yum install python3 devel
if it is python2, the corresponding installation command is
sudo Yum install python3 devel

RuntimeError: received 0 items of ancdata

Party 1:

pool = torch.multiprocessing.Pool(torch.multiprocessing.cpu_count(), maxtasksperchild=1)

Party 2:

   Modify the tensor mode of multithreading to file_ System (the default mode is file)_ Descriptor, limited by the number of open files:

 torch.multiprocessing.set_sharing_strategy('file_system')

Party 3:

Increase the number of open files:

Instead of using sudo ulimit – N command, execute:

sudo sh -c "ulimit -n 65535 && exec su $LOGNAME"