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python 快速创建字典 fromkes()
作用:快速创建字典特点:共用valueseq=['google','ie','firefox']#seq为可迭代对象(str,list,tuple,dict,set)dic=dict.fromkeys(seq)print(dic)#{'google':None,'ie':None,'firefox':None}dic2...
开发笔记
·
2024-08-31
python
快速
创建
字典
fromkes
create pfile from spfile;
sql>createpfilefromspfile;生成的文件在$ORACLE_HOME/dbs/下边和spfile在同一个目录下但是名字已经变成了init$oracle_sid.ora比如我的数据库叫orcl,那么生成的文件名就中:initorcl.ora============初始化参数===在$ORACLE...
开发笔记
·
2024-06-21
create
pfile
from
spfile
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: Too many connections
最简单的办法是因为你的my.ini中设定的并发连接数太少或者系统繁忙导致连接数被占满解决方式:打开MySQL安装目录打开MY.INI找到max_connections默认是100.--实例WINDOWS解决mysql Errno.:1040错误XXXXinfo:CannotconnecttoMySQLserv...
开发笔记
·
2024-04-29
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException
Data
source
rejected
establishment
ORA-25228: timeout or end-of-fetch during message dequeue from string.string
文档解释ORA-25228:timeoutorend-of-fetchduringmessagedequeuefromstring.stringCause:User-specifieddequeuewaittimehaspassedortheendofthequeuehasbeenreachedbutnomessage...
IT技术学习
·
2023-07-28
ORA-25228
timeout
or
end-of-fetch
during
ORA-51704: Error string received from XPath engine
文档解释ORA-51704:ErrorstringreceivedfromXPathengineCause:AnerrorwasreceivedfromtheXPathlibraryduringanXPathoperation.Action:Checkxmlerr.htounderstandthecauseofthee...
IT技术学习
·
2023-07-28
ORA-51704
Error
string
received
from
ORA-48938: View select column count differs from select alias list
文档解释ORA-48938:ViewselectcolumncountdiffersfromselectaliaslistCause:Theviewaliaslisthasadifferentnumberoffieldsthantheselectlist”Action:Changethealiaslisto...
IT技术学习
·
2023-07-28
select
ORA-48938
View
column
count
ORA-32310: object materialized views must select from an object table
文档解释ORA-32310:objectmaterializedviewsmustselectfromanobjecttableCause:Anattemptwasmadetocreateanobjectmaterializedviewwhosedefinitionquerydidnotselectfromanobje...
IT技术学习
·
2023-07-28
object
ORA-32310
materialized
views
must
ORA-22905: cannot access rows from a non-nested table item
文档解释ORA-22905:cannotaccessrowsfromanon-nestedtableitemCause:attempttoaccessrowsofanitemwhosetypeisnotknownatparsetimeorthatisnotofanestedtabletypeAction:useCAST...
IT技术学习
·
2023-07-28
ORA-22905
cannot
access
rows
from
ORA-46086: Cannot detach from a direct-login XS session
文档解释ORA-46086:Cannotdetachfromadirect-loginXSsessionCause:AnattemptwasmadetodetachfromanXSsessioncreatedbyadirectpasswordlogin.Action:TodetachanddestroytheXSses...
IT技术学习
·
2023-07-28
ORA-46086
Cannot
detach
from
direct-login
ORA-28512: cannot get data dictionary translations from string
文档解释ORA-28512:cannotgetdatadictionarytranslationsfromstringCause:ORACLEwasunabletoretrievedatadictionarytranslationinformationforthenon-Oraclesystemconnectedthr...
IT技术学习
·
2023-07-28
ORA-28512
cannot
get
data
dictionary
ORA-19511: Error received from media manager layer, error text: string
文档解释ORA-19511:Errorreceivedfrommediamanagerlayer,errortext:stringCause:AnerroroccurredinthemediamanagementsoftwarewhichislinkedwiththeOracleservertoperformbacku...
IT技术学习
·
2023-07-27
ORA-19511
Error
received
from
media
ORA-25241: cannot change correlation ID from string to string without FIRST_MESSAGE option
文档解释ORA-25241:cannotchangecorrelationIDfromstringtostringwithoutFIRST_MESSAGEoptionCause:AnattemptwasmadetochangethecorrelationIDwhileusingtheNEXT_MESSAGEorNEXT...
IT技术学习
·
2023-07-27
string
ORA-25241
cannot
change
correlation
ORA-19036: Invalid query result set in newContextFromHierarchy()
文档解释ORA-19036:InvalidqueryresultsetinnewContextFromHierarchy()Cause:TheresultsetofthequeryusedinthenewContextFromHierarchy()doesnothavethesamepropertyastheresul...
IT技术学习
·
2023-07-27
ORA-19036
Invalid
query
result
set
ORA-19754: error reading from change tracking file
文档解释ORA-19754:errorreadingfromchangetrackingfileCause:AnI/Oerroroccurredwhilereadingfromthechangetrackingfile.Action:Therewillbeothermessagesontheerrorstackthat...
IT技术学习
·
2023-07-27
ORA-19754
error
reading
from
change
ORA-08238: smsfre: cannot detach from SGA
文档解释ORA-08238:smsfre:cannotdetachfromSGACause:Then_coresystemcallfailedwhiledetachingfromtheSGA.Action:ChecknCXerror,andcontactyourcustomersupportrepresentative...
IT技术学习
·
2023-07-27
ORA-08238
smsfre
cannot
detach
from
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