Why we cannot perform an alter table directly to update schema?How mysql performs alter table: Lock the tableMake a copy of the table Modify the copy (the "new table")Copy all the rows into
原创 2017-02-20 08:44:48
891阅读
It might be possible for our node server has some downtime, no matter it is because server update or simply some crashs in the code. We want to minizi
转载 2019-03-09 17:16:00
84阅读
2评论
ARMONK, N.Y. - 06 Nov 2015: IBM (NYSE: IBM) announced today two new services for IBM Cloud -- IBM Active Deploy and IBM Event Hub. These features help developers avoid disruption to apps ...
转载 2022-06-24 22:32:49
75阅读
Problem Description: W2 have a production database and need to configure a GoldenGate uni-directional replication in real time without downtime. Is there a best practice, white paper, knowledge doc
原创 2010-12-07 22:19:34
425阅读
Prepare 10g Database for OGG Create GGS and GGS_MON Database Users SQL> create tablespace ggs_tbs datafile '/u01/app/oracle/oradata/zwc/gg_tbs01.dbf' size 100M; Tablespace created. SQL> create
转载 2015-09-27 21:42:00
67阅读
2评论
DDL Setup StepsSQL> grant execute on utl_file to ggs;Grant succee
转载 2015-08-10 12:14:00
71阅读
2评论
Source Database DB Name:        zwc Schemas:         HR,OE,PM Version:          10.2.0.4 RAC:                No OS Version:     Red Hat Enterprise Linux Server release 5.9 x86_64 OGG Version:
转载 2015-02-23 18:41:00
97阅读
2评论
Target Side Setup Install OGG on Target Side Creates required directories for OGG [oracle@vzwc1 ggs]$ ./ggsci Oracle GoldenGate Command Interpreter fo
转载 2017-04-20 14:17:00
216阅读
2评论
(给Python开发者加星标,提升Python技能)作者:Charles LeiferPython 3.8 发布在即,核心开发者团队让我总结一下最近讨论的 Python 4.0 预计推出的新功能,代码名为“ Ouroboros:自噬蛇”。Python 4.0 是大家翘首以盼的新版本,也将成为 Python 历史上的重大里程碑,在此感谢为之努力奋斗的 100 多名贡献者。经过邮件列表上的论战,PEP
from:http://utildothashmap.blogspot.com/2011/08/negative-zero-vs-positive-zero.htmlIncase if you crossed your SCJP certification, you might aware of negative zero. Otherwise I don’t think we often ref
转载 精选 2013-08-16 11:09:48
2168阅读
You're investigating what happened when one of your computer systems recently broke down. So far you've concluded that the system was overloaded; it l
转载 2018-07-27 14:51:00
67阅读
2评论
Zero or OneFile: zero.[c|cpp|java]Everyone probably knows the game Zero or One (in some regions in Brazil also known as Two orOne), used to determine a winner among three or more players. For those...
原创 2021-06-17 15:10:44
422阅读
针对postgresql被除数不可以为01.select COALESCE(b.price, 0) as price from fruit_sale b 2.select case when c2=0 then null else c1/c2 end from tbl; 3.修改PG源码,新增一个GUC变量如enable_divs_zero,默认为off,则使用原有的处理方式。
原创 11月前
65阅读
2017年10月19日,DeepMind团队重磅发布AlphaGo Zero,再次...
转载 2022-04-20 20:32:59
491阅读
# Divide By Zero in Java: A Deep Dive In the world of programming, one of the most common errors that developers encounter is the infamous "divide by zero" error. This error occurs when a program att
原创 24天前
3阅读
​传统的I/O使用传统的I/O程序读取文件内容, 并写入到另一个文件(或Socket), 如下程序:File.read(fileDesc, buf, len);Socket.send(socket, buf, len);会有较大的性能开销, 主要表现在一下两方面:1. 上下文切换(context switch), 此处有4次用户态和内核态的切换2. Buffer内存开销, 一个是应用程序buffe
转载 2020-06-14 10:25:00
169阅读
2评论
Zero or OneFile: zero.[c|cpp|java]Everyone probably knows the game Zero or One (in some regions in Brazil also known as Two orOne), used to determine a winner among three or more players. For those...
原创 2022-03-01 17:31:26
555阅读
在类UNIX操作系统中,/dev/zero是一个特殊的文件,当你读它的时候,它会提供无限的空字符(NULL,ASCIINUL, 0x00)。其中的一个典型用法是用它提供的字符流来覆盖信息,另一个常见用法是产生一个特定大小的空白文件。BSD就是通过mmap把/dev/zero映射到虚地址空间实现共享内存的。下面的方法可以用于破坏分区数据:# 请不要执行下列代码,除非你试图破坏分区上的全部数据! dd if=/dev/zero of=/dev/ 创建一个名为'foobar'大小为1MB的文件,以"0"填充:dd if=/dev/zero of=foobar co
原创 2021-09-01 11:43:12
522阅读
<br /> <br />       The present document explains in detail the exact steps to migrate ASM
原创 2022-09-02 08:53:36
70阅读
  • 1
  • 2
  • 3
  • 4
  • 5