社区
学习
工具库
AI工具
休闲
搜索
简体中文
目录
FAILED TO READ MORROR SIDE 1
Bug 属性
相关产品
首页 数据库 mysql教程 FAILEDTOREADMORRORSIDE1

FAILEDTOREADMORRORSIDE1

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
Jun 07, 2016 pm 03:54 PM

FAILED TO READ MORROR SIDE 1 问题描述： 环境： RAC p740 p550 -bash-3.2$ srvctl status database -d kmis Instance kmis1 is running on node p550 Instance kmis2 is not running on node p740 AIX -bash-3.2$ oslevel -r 6100-08 数据库 oracle 11.2.2

FAILED TO READ MORROR SIDE 1

问题描述：

环境：
RAC p740 p550
-bash-3.2$ srvctl status database -d kmis

Instance kmis1 is running on node p550
Instance kmis2 is not running on node p740

AIX
-bash-3.2$ oslevel -r
6100-08

数据库 oracle 11.2.2 

$ srvctl start database -d kmis

PRCR-1079 : Failed to start resource ora.kmis.db

CRS-5017: The resource action "ora.ARCHDG.dg start" encountered the following error:

ORA-15032: not all alterations performed

ORA-15017: diskgroup "ARCHDG" cannot be mounted

ORA-15063: ASM discovered an insufficient number of disks for diskgroup "ARCHDG"

ORA-15080: synchronous I/O operation to a disk failed

CRS-2674: Start of 'ora.ARCHDG.dg' on 'p740' failed

CRS-2632: There are no more servers to try to place resource 'ora.kmis.db' on that would satisfy its placement policy

$

$ srvctl start instance -d kmis -i kmis2 -o open;

PRCR-1013 : Failed to start resource ora.kmis.db

PRCR-1064 : Failed to start resource ora.kmis.db on node p740

CRS-5017: The resource action "ora.ARCHDG.dg start" encountered the following error:

ORA-15032: not all alterations performed

ORA-15017: diskgroup "ARCHDG" cannot be mounted

ORA-15063: ASM discovered an insufficient number of disks for diskgroup "ARCHDG"

ORA-15080: synchronous I/O operation to a disk failed

1

p550

ASMCMD> ls -lState Type Rebal NameMOUNTED EXTERN N ARCHDG/MOUNTED NORMAL N CRS/MOUNTED EXTERN N DATADG/ASMCMD> host

p740上

MOUNTED NORMAL N CRS/MOUNTED EXTERN N DATADG/挂载不上 ARCDG

一挂载就报错

odm：

单击此项可添加到收藏夹\ 通过电子邮件发送此文档的链接\ 可打印页\ 转到底部转到底部\
 
\
\ \
 
   

Bug 属性

    
 
B - Defect 12.1
2 - Severe Loss of Service 11.2.0.1
90 - Closed, Verified by Filer 212 - IBM AIX on POWER Systems (64-bit)
2010-12-22
2014-3-19 N/A
11.2.0.1 Generic
Oracle
\
 
   

相关产品

    
 
Oracle Database Products Oracle Database Suite
Oracle Database 5 - Oracle Database - Enterprise Edition
\ 
Hdr: 10422126 11.2.0.1 RDBMS 11.2.0.1 ASM PRODID-5 PORTID-212
Abstract: FAILED TO READ MORROR SIDE 1
 
<strong>*** 12/22/10 03:46 am ***</strong>
----
 
PROBLEM:
--------
Alert log spooling this error continously and filling up available space.
Here is the message.
-----------------------
WARNING: failed to read mirror side 1 of virtual extent 665 logical extent 0 
of file 280 in group [1.445758315] from disk ASM_ESBQA001_DATA1_0005 
allocation unit 75811 reason error; if possible,will try another mirror side
-----------------------
 
When the problem starts, errors spin in the alert log until disk space is 
exausted. We have found that the process that is refrenced in the trace is 
usually an orphaned ebiz form.
 
Recent Changes - Upgrade to 11.2.0.1
 
Over the weekend we have upgraded Production Database to 11.2.0.1.  We&#39;ve had 
2 occurrence of the issue on 2 of the RAC nodes.
 
The issue had happened in QA and we have tried to drop the disk and add new 
disk again, but it did not solve the problem.
 
One more thing to note is, when this happens, there was a "run-away" process 
that also generates the same error message in a trace file. As long as that 
session/process is killed, the error messages stops.  Please investigate.
 
DIAGNOSTIC ANALYSIS:
--------------------
This looks closely related to bug.10051315 and bug.10055063
But customer has applied these patches already, even then we still see the 
same warning messages.
 
We are still trying to get information from customer to understand how that 
session is being killed(not sure could be from database end --or application 
end).
 
Customer confirmed the following :
---------------
1.) Are they in-house scripts scheduled in database/os which are going to 
kill the inactive sessions at database/os level ?
-- There are not any scripts scheduled to kill sessions.  When this error 
starts happening, we kill the process manually.
 
2.) Is this happening only during specific intervals.
-- I cannot see a pattern as to when it is happening.  It seems random.
 
3.) Please confirm - the ASM instance is functional (one can connect to it, 
run queries on the various v$asm% views, like: v$asm_diskgroup, v$asm_disk)
-- Yes, ASM is functional during the error.  All other sessions continue to 
run without errors.
---------------
 
WORKAROUND:
-----------
As long as that session/process is killed, the error messages stops.
 
RELATED BUGS:
-------------
bug.10051315 and bug.10055063
 
REPRODUCIBILITY:
----------------
Its random.
 
TEST CASE:
----------
NA
 
STACK TRACE:
------------
Function List   (to Full stack)   (to Summary stack)
 
     ksedsts <- ksdxfstk <- ksdxcb <- sspuser <- f0
        <- sdbgrfucf_close_file <- sdbgrfcf_close_file <- dbgrlWriteTextOnly 
<- dbgrlWriteAlertDetail_int <- dbgrlWriteAlertDetail
         <- dbgrlWriteAlertText <- dbkrlWriteAlertText <- dbkrlPril <- ksdfmw 
<- ksdwrt
          <- kfioCompleteIO <- kfioWaitIO <- kfioRequestPriv <- kfioRequest 
<- ksfd_kfioRequest
           <- ksfd_osmio <- ksfd_io <- ksfdread <- kcfrbd1 <- kcbzib
            <- kcbgcur <- kturRollbackToSavepoint <- ktcrsp1 <- ksures <- 
ksuxds
             <- kssdel <- kssdch <- ksudlp <- opidcl <- opidrv
              <- sou2o <- opimai_real <- ssthrdmain <- main
 
SUPPORTING INFORMATION:
-----------------------
Customer&rsquo;s Management name:      Al Fischer
Customer&#39;s Management 24x7 contact number:      +1-616-648-6244
Customer&rsquo;s Management email:      al.fischer@amway.com
Primary Customer Email address:      eric.lai
Secondary Contact Name:      George Zhang
Secondary Contact Email:      (EMAIL ADDRESS)  george.zhang@alticor.com
 
24 HOUR CONTACT INFORMATION FOR P1 BUGS:
----------------------------------------
 
DIAL-IN INFORMATION:
--------------------
 
IMPACT DATE:
------------
" system at risk of crashing as alert logging is filling up; causing forms to 
hang at Call Center"
 
<strong>*** 12/22/10 03:57 am ***</strong>
<strong>*** 12/22/10 04:20 am ***</strong>
<strong>*** 12/22/10 04:21 am ***</strong>
<strong>*** 12/22/10 04:21 am *** (CHG: Sta->16)</strong>
<strong>*** 12/22/10 04:33 am ***</strong>
<strong>*** 12/22/10 05:35 am ***</strong>
<strong>*** 12/22/10 06:08 am ***</strong>
<strong>*** 12/22/10 06:09 am ***</strong>
<strong>*** 12/22/10 06:10 am ***</strong>
<strong>*** 12/22/10 08:06 am ***</strong>
<strong>*** 12/22/10 11:25 am *** </strong>
<strong>*** 12/22/10 11:25 am ***</strong>
<strong>*** 12/22/10 01:47 pm *** (CHG: Sta->10)</strong>
<strong>*** 12/22/10 01:47 pm ***</strong>
<strong>*** 12/22/10 07:46 pm ***</strong>
<strong>*** 12/22/10 07:58 pm ***</strong>
File versions form GI & RDBMS homes.
 
Below is the info from GI_HOME.
 
[usax02w] $ ar -t -v -X32_64 $GI_HOME/lib/libserver11.a kfd.o
rw-rw-rw- 10000/1026  393236 Nov 15 13:29 2010 kfd.o
[usax02w] $ ar -t -v -X32_64 $GI_HOME/lib/libserver11.a kfdp.o
rw-rw-rw- 10000/1026  271741 Nov 15 13:29 2010 kfdp.o
[usax02w] $ ar -t -v -X32_64 $GI_HOME/lib/libserver11.a kfkio.o
rw-rw-rw- 10000/1026  103575 Nov 15 13:29 2010 kfkio.o
[usax02w] $ ar -t -v -X32_64 $GI_HOME/lib/libserver11.a kfksubs.o
rw-rw-rw- 10000/1026  166215 Nov 15 13:29 2010 kfksubs.o
 
 
 Below is the info from RDBMS_HOME
 
[usax02w] $ echo $ORACLE_HOME
/u01/apps/oracle/product/11.2.0/db_1
[usax02w] $ ar -t -v -X32_64 $ORACLE_HOME/lib/libserver11.a kfd.o
rw-rw-rw- 10000/1026  393236 Nov 15 13:29 2010 kfd.o
[usax02w] $ ar -t -v -X32_64 $ORACLE_HOME/lib/libserver11.a kfdp.o
rw-rw-rw- 10000/1026  271741 Nov 15 13:29 2010 kfdp.o
[usax02w] $ ar -t -v -X32_64 $ORACLE_HOME/lib/libserver11.a kfkio.o
rw-rw-rw- 10000/1026  103575 Nov 15 13:29 2010 kfkio.o
[usax02w] $ ar -t -v -X32_64 $ORACLE_HOME/lib/libserver11.a kfksubs.o
rw-rw-rw- 10000/1026  166215 Nov 15 13:29 2010 kfksubs.o
 
 
Regards,
Prathap
<strong>*** 12/22/10 08:01 pm *** (CHG: Sta->16)</strong>
<strong>*** 12/22/10 08:25 pm ***</strong>
<strong>*** 12/23/10 01:48 am ***</strong>
<strong>*** 12/23/10 02:46 am ***</strong>
<strong>*** 12/23/10 06:25 am *** (CHG: Sta->11)</strong>
<strong>*** 12/23/10 06:25 am ***</strong>
<strong>*** 12/23/10 06:26 am *** </strong>
<strong>*** 12/23/10 06:26 am ***</strong>
<strong>*** 12/24/10 01:43 am *** </strong>
<strong>*** 12/24/10 01:43 am ***</strong>
<strong>*** 12/27/10 11:33 am ***</strong>
<strong>*** 12/27/10 11:45 am ***</strong>
<strong>*** 12/27/10 11:51 am ***</strong>
<strong>*** 12/27/10 12:22 pm *** ESCALATED</strong>
<strong>*** 12/27/10 12:22 pm ***</strong>
<strong>*** 12/27/10 12:29 pm ***</strong>
<strong>*** 12/28/10 12:42 am *** (CHG: Sta->30)</strong>
<strong>*** 12/28/10 12:42 am ***</strong>
<strong>*** 12/28/10 05:00 am *** (CHG: Sta->16)</strong>
<strong>*** 12/28/10 05:00 am ***</strong>
<strong>*** 12/28/10 05:08 am *** (CHG: Sta->11)</strong>
<strong>*** 12/28/10 09:37 am ***</strong>
<strong>*** 12/29/10 02:51 am ***</strong>
<strong>*** 12/31/10 03:05 am ***</strong>
<strong>*** 01/02/11 08:28 pm ***</strong>
<strong>*** 01/04/11 01:43 am *** (CHG: Sta->30)</strong>
<strong>*** 01/04/11 01:43 am ***</strong>
<strong>*** 01/04/11 01:54 am ***</strong>
<strong>*** 01/04/11 04:50 am *** (CHG: Sta->11)</strong>
<strong>*** 01/04/11 04:50 am ***</strong>
<strong>*** 01/05/11 01:26 am *** (CHG: Sta->30)</strong>
<strong>*** 01/05/11 01:26 am ***</strong>
<strong>*** 01/10/11 10:46 am ***</strong>
<strong>*** 01/10/11 10:46 am *** (CHG: Sta->11)</strong>
<strong>*** 01/11/11 03:14 am ***</strong>
<strong>*** 01/13/11 11:32 pm ***</strong>
RELEASE NOTES:
]]  kfk SO is deleted, while there are still allocated sessions.
 
 
REDISCOVERY INFORMATION:
 The following error, even with fix 10051315:
 
 WARNING: IO Failed. group:1 disk(number.incarnation):5.0xe0d14bb7 
 disk_path:/dev/ASM_1457_4 
          AU:75811 disk_offset(bytes):79494299648 io_size:8192 operation:Read 
 type:synchronous 
          result:I/O error process_id:2338940 
          subsys:System iop:0x110939310 bufp:0x70000016f2ec000 
 osderr:0x434c5344 osderr1:0x0
WORKAROUND:
None
<strong>*** 01/13/11 11:44 pm *** </strong>
<strong>*** 01/13/11 11:44 pm *** </strong>
<strong>*** 01/13/11 11:44 pm *** (CHG: Sta->80)</strong>
<strong>*** 01/16/11 11:05 pm ***</strong>
<strong>*** 01/16/11 11:17 pm ***</strong>
<strong>*** 01/16/11 11:36 pm ***</strong>
<strong>*** 01/17/11 12:01 am ***</strong>
<strong>*** 01/17/11 07:09 am ***</strong>
<strong>*** 01/17/11 07:11 am ***</strong>
<strong>*** 01/17/11 09:25 am ***</strong>
<strong>*** 01/17/11 10:16 am ***</strong>
<strong>*** 01/17/11 11:14 pm ***</strong>
<strong>*** 01/18/11 05:06 am ***</strong>
<strong>*** 01/18/11 11:47 am ***</strong>
<strong>*** 01/18/11 11:52 pm ***</strong>
<strong>*** 01/19/11 02:05 am ***</strong>
<strong>*** 01/19/11 05:39 am ***</strong>
<strong>*** 01/19/11 05:45 am ***</strong>
<strong>*** 01/19/11 07:43 am ***</strong>
<strong>*** 01/19/11 08:44 am ***</strong>
<strong>*** 01/19/11 06:12 pm ***</strong>
<strong>*** 01/19/11 06:14 pm ***</strong>
<strong>*** 01/19/11 10:53 pm ***</strong>
<strong>*** 01/20/11 12:11 am ***</strong>
<strong>*** 01/20/11 04:04 am ***</strong>
<strong>*** 01/20/11 06:11 am ***</strong>
<strong>*** 01/20/11 06:59 am ***</strong>
<strong>*** 01/20/11 09:13 am ***</strong>
<strong>*** 01/20/11 10:44 am ***</strong>
<strong>*** 01/20/11 10:44 am ***</strong>
<strong>*** 01/20/11 11:00 am ***</strong>
<strong>*** 01/20/11 11:38 am ***</strong>
<strong>*** 01/20/11 04:58 pm ***</strong>
<strong>*** 01/21/11 04:05 am ***</strong>
<strong>*** 01/24/11 11:33 am ***</strong>
<strong>*** 01/25/11 02:17 am ***</strong>
<strong>*** 01/27/11 02:58 am ***</strong>
<strong>*** 01/27/11 03:16 am ***</strong>
<strong>*** 01/27/11 03:37 am ***</strong>
<strong>*** 01/27/11 03:49 am ***</strong>
<strong>*** 02/02/11 04:37 am ***</strong>
<strong>*** 02/04/11 08:25 pm ***</strong>
<strong>*** 02/05/11 02:46 am ***</strong>
<strong>*** 02/05/11 02:58 am ***</strong>
<strong>*** 02/05/11 02:59 am ***</strong>
<strong>*** 02/05/11 02:29 pm ***</strong>
<strong>*** 02/05/11 07:19 pm ***</strong>
<strong>*** 02/05/11 09:37 pm ***</strong>
<strong>*** 02/07/11 01:37 am ***</strong>
<strong>*** 02/07/11 06:14 am ***</strong>
<strong>*** 02/07/11 12:35 pm ***</strong>
<strong>*** 02/07/11 06:46 pm ***</strong>
<strong>*** 02/07/11 08:33 pm ***</strong>
<strong>*** 02/08/11 01:52 pm ***</strong>
<strong>*** 02/08/11 02:42 pm ***</strong>
<strong>*** 02/08/11 10:32 pm ***</strong>
<strong>*** 02/09/11 11:51 pm ***</strong>
<strong>*** 02/10/11 08:56 am ***</strong>
<strong>*** 02/10/11 08:59 am ***</strong>
<strong>*** 02/10/11 09:30 am ***</strong>
<strong>*** 02/11/11 11:52 pm ***</strong>
<strong>*** 02/12/11 05:10 pm ***</strong>
<strong>*** 02/15/11 02:55 am ***</strong>
<strong>*** 02/15/11 10:13 am ***</strong>
<strong>*** 02/16/11 01:07 am ***</strong>
<strong>*** 02/16/11 06:34 am ***</strong>
<strong>*** 02/18/11 01:39 am ***</strong>
<strong>*** 02/18/11 01:40 am ***</strong>
<strong>*** 02/24/11 07:20 am ***</strong>
<strong>*** 02/24/11 07:35 am ***</strong>
<strong>*** 02/25/11 12:34 am ***</strong>
<strong>*** 03/02/11 07:59 am ***</strong>
<strong>*** 03/02/11 08:25 am ***</strong>
<strong>*** 03/03/11 01:22 am ***</strong>
<strong>*** 03/03/11 03:34 pm ***</strong>
<strong>*** 03/07/11 11:54 am ***</strong>
<strong>*** 03/08/11 08:53 pm ***</strong>
<strong>*** 03/09/11 10:44 pm ***</strong>
<strong>*** 04/20/11 01:17 pm ***</strong>
<strong>*** 04/21/11 09:34 am ***</strong>
<strong>*** 04/21/11 01:46 pm ***</strong>
<strong>*** 04/22/11 03:47 pm ***</strong>
<strong>*** 04/29/11 12:33 pm ***</strong>
<strong>*** 04/29/11 01:21 pm ***</strong>
<strong>*** 05/02/11 07:53 am ***</strong>
<strong>*** 05/03/11 01:12 am ***</strong>
<strong>*** 05/03/11 01:37 am ***</strong>
<strong>*** 05/03/11 02:11 am ***</strong>
<strong>*** 05/11/11 03:00 am ***</strong>
<strong>*** 05/11/11 03:44 am ***</strong>
<strong>*** 05/16/11 08:07 am ***</strong>
<strong>*** 05/17/11 11:31 am ***</strong>
<strong>*** 05/17/11 11:34 am ***</strong>
<strong>*** 05/17/11 03:14 pm ***</strong>
<strong>*** 05/17/11 03:16 pm ***</strong>
<strong>*** 05/18/11 06:00 am ***</strong>
<strong>*** 05/18/11 06:11 am ***</strong>
<strong>*** 05/18/11 08:46 am ***</strong>
<strong>*** 06/09/11 12:44 pm ***</strong>
<strong>*** 06/10/11 10:21 am ***</strong>
<strong>*** 06/10/11 10:21 am ***</strong>
<strong>*** 06/11/11 04:44 am ***</strong>
<strong>*** 06/14/11 10:14 pm ***</strong>
<strong>*** 06/17/11 12:33 pm ***</strong>
<strong>*** 07/04/11 01:09 pm ***</strong>
<strong>*** 07/06/11 04:03 pm ***</strong>
<strong>*** 07/06/11 04:56 pm ***</strong>
<strong>*** 07/08/11 11:47 am ***</strong>
<strong>*** 07/08/11 12:16 pm ***</strong>
<strong>*** 07/12/11 07:28 am ***</strong>
<strong>*** 07/14/11 07:58 pm *** </strong>
<strong>*** 07/17/11 05:29 am ***</strong>
<strong>*** 07/17/11 05:30 am ***</strong>
<strong>*** 07/18/11 03:23 pm ***</strong>
<strong>*** 07/26/11 03:20 pm ***</strong>
<strong>*** 07/26/11 03:23 pm ***</strong>
<strong>*** 07/27/11 03:13 am ***</strong>
<strong>*** 07/27/11 03:15 am ***</strong>
<strong>*** 07/27/11 07:33 am ***</strong>
<strong>*** 08/02/11 01:34 pm ***</strong>
<strong>*** 08/03/11 01:03 am *** </strong>
<strong>*** 08/03/11 01:03 am ***</strong>
<strong>*** 08/03/11 01:15 am *** </strong>
<strong>*** 08/03/11 01:15 am ***</strong>
<strong>*** 08/05/11 08:00 am ***</strong>
<strong>*** 08/05/11 08:11 am ***</strong>
<strong>*** 08/05/11 10:42 am ***</strong>
<strong>*** 08/11/11 01:22 am ***</strong>
<strong>*** 08/12/11 04:00 am ***</strong>
<strong>*** 08/12/11 10:03 am ***</strong>
<strong>*** 08/18/11 12:46 pm ***</strong>
<strong>*** 08/22/11 12:14 pm ***</strong>
<strong>*** 09/07/11 04:49 am ***</strong>
<strong>*** 09/09/11 02:55 pm ***</strong>
<strong>*** 09/14/11 02:40 pm ***</strong>
<strong>*** 10/14/11 02:15 am ***</strong>
<strong>*** 10/14/11 02:15 am *** ESCALATION -> CLOSED</strong>
<strong>*** 10/14/11 02:15 am *** (CHG: Sta->90)</strong>
<strong>*** 10/14/11 02:21 am *** </strong>
<strong>*** 10/14/11 02:21 am ***</strong>
<strong>*** 10/14/11 09:56 am ***</strong>
<strong>*** 11/01/11 01:55 am ***</strong>
<strong>*** 11/01/11 10:49 am ***</strong>
<strong>*** 11/01/11 10:49 am ***</strong>
<strong>*** 11/27/11 01:15 am ***</strong>
<strong>*** 12/01/11 09:11 am ***</strong>
<strong>*** 01/17/12 03:29 pm ***</strong>
<strong>*** 01/23/12 08:26 pm ***</strong>
<strong>*** 01/23/12 08:26 pm ***</strong>
<strong>*** 03/14/12 01:07 am ***</strong>
<strong>*** 03/18/12 11:22 pm ***</strong>
<strong>*** 03/22/12 12:44 am ***</strong>
<strong>*** 04/02/12 06:10 am ***</strong>
<strong>*** 04/24/12 10:45 am ***</strong>
<strong>*** 01/26/13 08:03 am ***</strong>
<strong>*** 01/31/13 07:35 am ***</strong>
<strong>*** 02/24/13 11:27 pm ***</strong>
<strong>*** 04/16/13 02:14 am ***</strong>
<strong>*** 04/19/13 07:23 am ***</strong>
<strong>*** 05/12/13 09:12 pm ***</strong>
<strong>*** 05/20/13 06:28 am ***</strong>
<strong>*** 06/25/13 01:16 am ***</strong>
<strong>*** 07/08/13 09:41 pm ***</strong>
<strong>*** 07/09/13 09:44 pm ***</strong>
<strong>*** 07/09/13 10:24 pm ***</strong>
<strong>*** 07/17/13 03:02 am ***</strong>
<strong>*** 07/18/13 02:35 am ***</strong>
<strong>*** 08/12/13 03:54 am ***</strong>
<strong>*** 08/20/13 12:21 am ***</strong>
<strong>*** 09/30/13 12:26 pm ***</strong>
<strong>*** 10/23/13 05:08 pm ***</strong>
<strong>*** 10/29/13 08:22 am ***</strong>
<strong>*** 10/29/13 09:56 am ***</strong>
<strong>*** 10/29/13 09:56 am ***</strong>
<strong>*** 12/18/13 03:38 am ***</strong>
<strong>*** 01/23/14 09:24 pm ***</strong>
<strong>*** 02/11/14 09:58 am ***</strong>
<strong>*** 02/24/14 03:11 am ***</strong>
<strong>*** 02/24/14 06:02 am ***</strong>
<strong>*** 02/24/14 12:34 pm ***</strong>
<strong>*** 02/24/14 03:58 pm ***</strong>
<strong>*** 02/25/14 02:28 am ***</strong>
<strong>*** 03/18/14 04:34 am ***</strong>
<strong>*** 03/18/14 04:55 am ***</strong>
<strong>*** 03/18/14 05:09 am ***</strong>
<strong>*** 03/18/14 10:37 pm ***</strong>
<strong>*** 03/19/14 12:39 am ***</strong>
登录后复制
本站声明
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn

热AI工具

Undresser.AI Undress

Undresser.AI Undress

人工智能驱动的应用程序，用于创建逼真的裸体照片

AI Clothes Remover

AI Clothes Remover

用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool

Undress AI Tool

免费脱衣服图片

Clothoff.io

Clothoff.io

AI脱衣机

Video Face Swap

Video Face Swap

使用我们完全免费的人工智能换脸工具轻松在任何视频中换脸！

显示更多

热门文章

<🎜>：种植花园 - 完整的突变指南
3 周前 By DDD
<🎜>：泡泡胶模拟器无穷大 - 如何获取和使用皇家钥匙
3 周前 By 尊渡假赌尊渡假赌尊渡假赌
如何修复KB5055612无法在Windows 10中安装？
3 周前 By DDD
北端：融合系统，解释
3 周前 By 尊渡假赌尊渡假赌尊渡假赌
Mandragora：巫婆树的耳语 - 如何解锁抓钩
3 周前 By 尊渡假赌尊渡假赌尊渡假赌
显示更多

热工具

记事本++7.3.1

记事本++7.3.1

好用且免费的代码编辑器

SublimeText3汉化版

SublimeText3汉化版

中文版，非常好用

禅工作室 13.0.1

禅工作室 13.0.1

功能强大的PHP集成开发环境

Dreamweaver CS6

Dreamweaver CS6

视觉化网页开发工具

SublimeText3 Mac版

SublimeText3 Mac版

神级代码编辑软件(SublimeText3)

显示更多

热门话题

Java教程
1666
14
CakePHP 教程
1426
52
Laravel 教程
1328
25
PHP教程
1273
29
C# 教程
1253
24
显示更多
Related knowledge
MySQL的角色：Web应用程序中的数据库 MySQL的角色：Web应用程序中的数据库 Apr 17, 2025 am 12:23 AM

MySQL在Web应用中的主要作用是存储和管理数据。1.MySQL高效处理用户信息、产品目录和交易记录等数据。2.通过SQL查询，开发者能从数据库提取信息生成动态内容。3.MySQL基于客户端-服务器模型工作，确保查询速度可接受。

说明InnoDB重做日志和撤消日志的作用。 说明InnoDB重做日志和撤消日志的作用。 Apr 15, 2025 am 12:16 AM

InnoDB使用redologs和undologs确保数据一致性和可靠性。1.redologs记录数据页修改，确保崩溃恢复和事务持久性。2.undologs记录数据原始值，支持事务回滚和MVCC。

MySQL的位置：数据库和编程 MySQL的位置：数据库和编程 Apr 13, 2025 am 12:18 AM

MySQL在数据库和编程中的地位非常重要，它是一个开源的关系型数据库管理系统，广泛应用于各种应用场景。1）MySQL提供高效的数据存储、组织和检索功能，支持Web、移动和企业级系统。2）它使用客户端-服务器架构，支持多种存储引擎和索引优化。3）基本用法包括创建表和插入数据，高级用法涉及多表JOIN和复杂查询。4）常见问题如SQL语法错误和性能问题可以通过EXPLAIN命令和慢查询日志调试。5）性能优化方法包括合理使用索引、优化查询和使用缓存，最佳实践包括使用事务和PreparedStatemen

MySQL与其他编程语言：一种比较 MySQL与其他编程语言：一种比较 Apr 19, 2025 am 12:22 AM

MySQL与其他编程语言相比，主要用于存储和管理数据，而其他语言如Python、Java、C 则用于逻辑处理和应用开发。 MySQL以其高性能、可扩展性和跨平台支持着称，适合数据管理需求，而其他语言在各自领域如数据分析、企业应用和系统编程中各有优势。

MySQL：从小型企业到大型企业 MySQL：从小型企业到大型企业 Apr 13, 2025 am 12:17 AM

MySQL适合小型和大型企业。1)小型企业可使用MySQL进行基本数据管理，如存储客户信息。2)大型企业可利用MySQL处理海量数据和复杂业务逻辑，优化查询性能和事务处理。

MySQL索引基数如何影响查询性能？ MySQL索引基数如何影响查询性能？ Apr 14, 2025 am 12:18 AM

MySQL索引基数对查询性能有显着影响：1.高基数索引能更有效地缩小数据范围，提高查询效率；2.低基数索引可能导致全表扫描，降低查询性能；3.在联合索引中，应将高基数列放在前面以优化查询。

初学者的MySQL：开始数据库管理 初学者的MySQL：开始数据库管理 Apr 18, 2025 am 12:10 AM

MySQL的基本操作包括创建数据库、表格，及使用SQL进行数据的CRUD操作。1.创建数据库：CREATEDATABASEmy_first_db;2.创建表格：CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY,titleVARCHAR(100)NOTNULL,authorVARCHAR(100)NOTNULL,published_yearINT);3.插入数据：INSERTINTObooks(title,author,published_year)VA

MySQL与其他数据库：比较选项 MySQL与其他数据库：比较选项 Apr 15, 2025 am 12:08 AM

MySQL适合Web应用和内容管理系统，因其开源、高性能和易用性而受欢迎。1)与PostgreSQL相比，MySQL在简单查询和高并发读操作上表现更好。2)相较Oracle，MySQL因开源和低成本更受中小企业青睐。3)对比MicrosoftSQLServer，MySQL更适合跨平台应用。4)与MongoDB不同，MySQL更适用于结构化数据和事务处理。

See all articles