rules

(postgresql) I was trying to COPY csv data into a table but I was getting duplicate key violation errors, and there's no way to tell COPY to ignore those, so following internet wisdom I tried adding this rule: CREATE OR REPLACE RULE ignore_duplicate_inserts AS ON INSERT TO mytable WHERE (EXISTS ( SELECT mytable.id FROM mytable WHERE mytable.id = new.id)) DO NOTHING; to circumvent the problem, but I still get those errors - any ideas why ? Rules by default add things to the current action : Roughly speaking, a rule causes additional commands to be executed when a given command on a given table

When I use a rewrite rule that splits an insert into one table into inserts to two other tables where one of the inserted values has as default nextval('some_sequence') with the same sequence for both tables, then the inserted default values are different in the two tables. This is probably due to simple text replacement by the rewrite rule. I had hoped instead that the default value would be first resolved and then the same value be written to both tables. Here an example (as you probably guess, I'm trying to implement specialization/generalization using rules): -- first and third commands

I'm having a bit of trouble with a homework problem, and I was wondering if anyone could point me in the right direction. Suppose we are compiling for a machine with 1-byte characters, 2-byte shorts, 4-byte integers, and 8-byte reals, and with alignment rules that require the address of every primitive data element to be an even multiple of the element’s size. Suppose further that the compiler is not permitted to reorder fields. How much space will be consumed by the following array? A : array [0..9] of record s : short; c : char; t : short; d : char; r : real; i : integer; end; Now I

I read about the naming of Java variables . It says that Java variables cannot start with any numbers and special characters except for $ and _. Some valid examples: int count; int _count; int $count; And some invalid examples: int %count; int 4count; int #count; Do the same rules apply to method names? Yes, method names and variable names are what's called "identifiers". Identifiers all share the same rules regarding accepted characters. Take a look at §3.8 from the Java Language Specification to find out exactly what an identifier may contain, and §6.2 for an explanation about how

I would like to use the same Ruleset in my IDE (Eclipse) that my Sonar profile. I got the PMD XML ruleset from the Sonar Permalinks and would like to import it into my PMD Eclipse Plugin but when i try to do it, the "OK" button is desactivated ... Can someone help me ? The problem could be that Sonar is exporting your ruleset for v4.x format and your Eclipse plugin expects them in v5.x format. Try changing your rules from: <rule ref="rulesets/basic.xml/UnusedNullCheckInEquals"> <priority>3</priority> </rule> to <rule ref="rulesets/java/basic.xml/UnusedNullCheckInEquals"> <priority>3</priority>

0.问题 一个同事搭建了两个主机的集群。ceph -s 后，集群一直会出现 recovery 32402/195672 objects degraded objects degraded 警告。 原因在于，默认3份副本。crush select策略是从host 选择3副本。所以需要修改crush rules. 1. 获取crushmap二进制文件 # ceph osd getcrushmap -o a.map 2.将二进制文件转成文本文件 # crushtool -d a.map -o b 3.修改rules # vi b rule replicated_ruleset { ruleset 0 type replicated min_size 1 max_size 10 step take default step chooseleaf firstn 0 type osd ### step emit } 4.将文本文件转成二进制文件 # crushtool -c b -o b.map 5.设置crushmap # ceph osd setcrushmap -i b.map 来源： oschina 链接： https://my.oschina.net/u/2407124/blog/497413