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Core Data中的多线程之二
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
【oracle】oracledba8 NOLOGGING
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
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
冷更新
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...
分类:其他好文   时间:2014-10-29 17:12:50    阅读次数:173
rac安装_grid安装校验报错之grid未建立信任关系
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...
分类:其他好文   时间:2014-10-25 21:32:32    阅读次数:362
DMA: Out of SW-IOMMU space
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..
分类:其他好文   时间:2014-10-20 19:38:36    阅读次数:473
Understanding Apache Log4j
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
localhost错误导致Rac root.sh执行失败
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
testdb11b root.sh执行结果
[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
Stack switching mechanism in a computer system
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...
分类:其他好文   时间:2014-09-09 12:00:48    阅读次数:171
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