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创建增量同步Oracle物化视图问题 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...如果将此表的主键增加字段并ENABLE后操作，又说：“ORA-23412: 主表的主键列已更改”。
但有一个奇怪的现象：在数据库B上我们也建立过物化视图，它却在此表的主键disable之后，还是正常运行。
我们介绍一下在数据库B上的创...
Benefits of using the conditional ?: (ternary) operator
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39
I always start out with a simple one and make it more complex over time until it is completely unreadable.
– Jouke va...
What Vim command(s) can be used to quote/unquote words?
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edited Jan 27 '10 at 15:30
answered Jan 27 '10 at 15:21
j...
请停下来重新想下 你究竟为何创业？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...业最好的结果可能是达到收支稳定。 从抽象角度来说，30%的概率挣300万美元、3%的概率挣3000万美元、0.3%的概率挣3个亿的效果都是一样好的。但实际上，你通常会试图让利益最大化，那么哪种会是你的选择？
有30%概率赚到300万...
不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...主机A 上执行命令
route add -host 172.16.110.80 gw 172.16.100.253
route add -host 172.16.110.80 gw 172.16.100.254
在主机B 上执行命令
route add -host 172.16.100.50 gw 172.16.100.253
route add -host 172.16.100.50 gw 172.16.100.254
执行ping 命令 可以通但是...
Conditional Variable vs Semaphore
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answered Aug 18 '10 at 16:35
Brent Writes CodeBrent Writes Code
15.6k66 gold badges4545 silver badges5656 bronze badges
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String formatting: % vs. .format vs. string literal
...uld always work:
"hi there %s" % name
yet, if name happens to be (1, 2, 3), it will throw a TypeError. To guarantee that it always prints, you'd need to do
"hi there %s" % (name,) # supply the single argument as a single-item tuple
which is just ugly. .format doesn't have those issues. Also ...
Is there a reason for C#'s reuse of the variable in a foreach?
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edited Sep 11 '13 at 16:20
answered Jan 17 '12 at 17:56
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Accessing Object Memory Address
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cs95
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answered Sep 23 '08 at 14:41
Nick Johnson...
Does PNG contain EXIF data like JPG?
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Edit: Version 1.5.0 (July 2017) of the Extensions to the PNG 1.2 Specification has finally adde...