康贤_个人页

RSS是83G，那么SHR是多少？ PG确实存在insert内存不断增大的现象，建议断开连接，再次Insert

太冒险了，不建议删除节点，如果想减少节点，新建一个集群吧，导出再导入，使用GP自带的gptransfer命令

语法上是不支持的

什么数据库

有的，select array_prepend(1, '{1}'); array_prepend这个函数

有节点挂掉了，先gprecoverseg -a 修复一下节点

gpstate -a看下

改成下面的SQL试试，GP优化器比较老，子查询优化不到位。select id, min (no) from test_a t, test_b l where l.a_id = t .id limit 100;

.20160908:15:16:35:gpinitsystem:iZ115m3daskZ:gpadmin-[FATAL]:-Unknown host iZ11mtchp6vZ Script Exiting!你直接 ssh iZ11mtchp6vZ看看能不能连通

位运算不能是double类型，必须是整形，所以不能把255强制转换成double-------------------------把错误日志也贴出来

一般两种方式：（1）show shared_buffer; 结果乘以4即总内存，我们一般配置shared_buffer是规格内存的1/4。（2）使用apenapi，https://help.aliyun.com/document_detail/rds/OpenAPI-manual/RDS-OpenAPI-InstanceManagement/DescribeDBInstanceAttribute.html?spm=5176.docrds/OpenAPI-manual/RDS-OpenAPI-ParameterManagement/ModifyeParameter.6.149.nIxWgG openapi程序：!/usr/bin/pythoncoding:utf-8try: import httplibexcept ImportError:import http.client as httplibimport sysimport urllibimport urllib2import timeimport jsonimport itertoolsimport mimetypesimport base64import hmacimport uuidfrom hashlib import sha1 class AliyunMonitor: def __init__(self,url): self.access_id = 'your_accesid' self.access_secret = 'your_secret' self.url = url 签名 def sign(self,accessKeySecret, parameters): sortedParameters = sorted(parameters.items(), key=lambda parameters: parameters[0]) canonicalizedQueryString = '' for (k,v) in sortedParameters: canonicalizedQueryString += '&' + self.percent_encode(k) + '=' + self.percent_encode(v) stringToSign = 'GET&%2F&' + self.percent_encode(canonicalizedQueryString[1:]) #使用get请求方法 h = hmac.new(accessKeySecret + '&', stringToSign, sha1) signature = base64.encodestring(h.digest()).strip() return signature def percent_encode(self,encodeStr): encodeStr = str(encodeStr) res = urllib.quote(encodeStr.decode(sys.stdin.encoding).encode('utf8'), '') res = res.replace('+', '%20') res = res.replace('*', '%2A') res = res.replace('%7E', '~') return res def make_url(self,params): timestamp = time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime()) parameters = { 'Format' : 'JSON', 'Version' : '2014-08-15', 'AccessKeyId' : self.access_id, 'SignatureVersion' : '1.0', 'SignatureMethod' : 'HMAC-SHA1', 'SignatureNonce' : str(uuid.uuid1()), 'TimeStamp' : timestamp, } for key in params.keys(): parameters[key] = params[key] signature = self.sign(self.access_secret,parameters) parameters['Signature'] = signature url = self.url + '/?' + urllib.urlencode(parameters) return url def do_request(self,params): url = self.make_url(params) print(url) request = urllib2.Request(url) try: conn = urllib2.urlopen(request) response = conn.read() except urllib2.HTTPError, e: print(e.read().strip()) raise SystemExit(e) try: obj = json.loads(response) except ValueError, e: raise SystemExit(e) print obj if name == '__main__':T = AliyunMonitor('https://rds.aliyuncs.com')T.do_request({'Action':'DescribeDBInstanceAttribute','DBInstanceId':'your_instance_name'})

Re我保存的草稿怎么查看啊 感谢两位好心人

Re怎么签到啊 梦丫头

Re文章支持markdown吗 git写的，这个论坛代码好诡异，写不好

太赞了