在CoreData中使用多线程一般不是为了能够提高性能和效率,而是为了使主线程能够不被阻塞,使能够在做其他数据操作的时候,UI还能够继续响应用户的行为。当执行fetch操作时,CoreData系统会根据需要自动开启多个线程做相应的操作,因此我们自己添加多线程并不能提高效率,而仅仅..
分类:
编程语言 时间:
2014-12-22 19:45:12
阅读次数:
172
You noticed that the index tablespace in your database requires a
recovery. However, instead of performing a media recovery, you decide
d to re-create the indexes in a new tablespace. Which two opti...
分类:
数据库 时间:
2014-12-20 18:15:57
阅读次数:
238
Spring Batch学习_ItemReaders and ItemWriters All batch processing can be described in its most simple form as reading in large amounts of data, performing some type of calculation or transformation...
分类:
编程语言 时间:
2014-11-03 14:47:54
阅读次数:
407
Cold Update
All changes other than the Hot update changes require a Cold Update.
Note:
A prerequisite for performing a cold update is that all documents are removed from the index. The standard...
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其他好文 时间:
2014-10-29 17:12:50
阅读次数:
173
原创作品,出自 “深蓝的blog” 博客,欢迎转载,转载时请务必注明以下出处,否则追究版权法律责任。
深蓝的blog:
1、报错
[grid@node1 grid]$ ./runcluvfy.sh stage -pre crsinst -n node1,node2 -fixup -verbose
Performing pre-checks for cluster services se...
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其他好文 时间:
2014-10-25 21:32:32
阅读次数:
362
场景描述:需要对整个系统的IO进行重新的部署WhenperformingalotofI/O,theXendom0kernelcrasheswiththefollowingerror:[325.437727]console[netcon0]enabled[325.437795]netconsole:networkloggingstarted[1076.017245]mpt2sas0000:03:00.0:DMA:OutofSW-IOMMUspacefor32768byte..
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其他好文 时间:
2014-10-20 19:38:36
阅读次数:
473
Overview of the log4j architecture:The architecture of the log4j API is layerd. Each layer consist of different objects performing different task.The ...
分类:
Web程序 时间:
2014-10-12 17:05:38
阅读次数:
224
环境:
AIX 7.1
Oracle Rac 11.2.0.3
root@kk01:/oraapp/grid/gridhome>./root.sh
Performing root user operation for Oracle 11g
The following environment variables are set as:
ORA...
分类:
其他好文 时间:
2014-09-25 19:30:07
阅读次数:
354
[root@testdb11b dev]# /u01/app/11.2.0/grid/root.sh Performing root user operation for Oracle 11g The following environment variables are set as: OR...
分类:
数据库 时间:
2014-09-19 02:16:54
阅读次数:
243
A method and mechanism for performing an unconditional stack switch in a processor. A processor includes a processing unit coupled to a memory. The me...
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其他好文 时间:
2014-09-09 12:00:48
阅读次数:
171