天线增益与dBi/dBd 6. dBc 参考文献 1.名词解释 dB (分贝) dB是一个比值,是一个数值,是一个纯计数方法,没有任何单位标注。 在不同领域有着不同的名称,因此它也代表不同的实际意义。 dB在电子学等领域中是一个很常用的单位。这个单位的特点在于使......
在本文的最后,通过定义了一套通用的 DBI 模块测试接口,对三种主流数据库 DB2,Sybase 和 MySql 进行测试,通过比较测试结果,得出了 DBI 模块在这三种数据库上的异同点和支持上的盲点。
See http://docs.mongodb.org/manual/reference/program/mongoimport/ for more information. general options: --help print usage --version print the tool version and exit verbosity options: -v, --verbose more detailed log output (include multiple times for more verbosity, e.g. -vvvvv) --quiet...
③dBd和dBi：dBi和dBd都是表示天线增益的计量单位，两者都是一个相对值， 但参考基准不一样。dBi的参...
应用程序驱动通过read reference来设定如何对副本集进行读取操作,默认的,客户端驱动所有的读操作都是直接访问primary节点的,从而保证了数据的严格一致性。有如下几种模式: mongo shell中复制相关方法 复制数据库的命令 用户管理和认证方法官方详细档:https://docs.mongodb.com/master/reference/security/#security-methods...
DbiResourceId -> (string)The Amazon Web Services Region-unique, immutable identifier for the DB instance. This identifier is found in Amazon Web Services CloudTrail log entries whenever the Amazon Web Services KMS key for the DB instance is accessed.CACertificateIdentifier -> (string)...
DbiResourceId -> (string)The Amazon Web Services Region-unique, immutable identifier for the DB instance. This identifier is found in Amazon Web Services CloudTrail log entries whenever the Amazon Web Services KMS key for the DB instance is accessed....
DbiResourceId -> (string)The Amazon Web Services Region-unique, immutable identifier for the DB instance. This identifier is found in Amazon Web Services CloudTrail log entries whenever the Amazon Web Services KMS key for the DB instance is accessed....
The handler must be a Python callable taking the following arguments: errorhandler(connection, cursor, errorclass, errorvalue) where connection is a reference to the connection on which the cursor operates, cursor a reference to the cursor (or None in case the error does not apply to a ...
Unfortunately in almost all cases that will be hard to debug, especially if you're working with a remote server. If it's a local serverengine then open nxsdServerEngine and put breakpoints on all lines that fire the DBIERR_REENTERED error. Once you stop at one of these lines, take a...