MySQL 8.4 Release Notes
ndb_drop_table 删除指定的 NDB 表。（如果你尝试在使用除 NDB 以外的存储引擎创建的表上使用此操作，则会失败，并显示错误 723: No such table exists。）此操作非常快速；在某些情况下，它比在 NDB 表上使用 MySQL 的 DROP
TABLE 语句快一个数量级。ndb_drop_table drops the specified
NDB table. (If you try to use this
on a table created with a storage engine other than
NDB, the attempt fails with the
error 723: No such table exists.) This
operation is extremely fast; in some cases, it can be an order
of magnitude faster than using a MySQL DROP
TABLE statement on an NDB
table.
用法Usage
ndb_drop_table -cconnection_stringtbl_name-ddb_name
可以与ndb_drop_table一起使用的选项如下表所示。表格之后有额外说明。Options that can be used with ndb_drop_table are shown in the following table. Additional descriptions follow the table.
命令行格式Command-Line Format --character-sets-dir=path--character-sets-dir=path包含字符集的目录。Directory containing character sets.
命令行格式Command-Line Format --connect-retries=#类型Type 整数Integer 默认值Default Value 12最小值Minimum Value 0最大值Maximum Value 12放弃之前重试连接的次数。Number of times to retry connection before giving up.
命令行格式Command-Line Format --connect-retry-delay=#类型Type 整数Integer 默认值Default Value 5最小值Minimum Value 0最大值Maximum Value 5尝试联系管理服务器之间等待的秒数。Number of seconds to wait between attempts to contact management server.
命令行格式Command-Line Format --connect-string=connection_string类型Type 字符串String 默认值Default Value [none][none]同
--ndb-connectstring。Same as--ndb-connectstring.命令行格式Command-Line Format --core-file错误时生成核心文件；用于调试。Write core file on error; used in debugging.
--database,-d命令行格式Command-Line Format --database=name类型Type 字符串String 默认值Default Value TEST_DB表所在的数据库名称。Name of the database in which the table resides.
命令行格式Command-Line Format --defaults-extra-file=path--defaults-extra-file=path类型Type 字符串String 默认值Default Value [none][none]在读取全局文件之后读取给定文件。Read given file after global files are read.
命令行格式Command-Line Format --defaults-file=path类型Type 字符串String 默认值Default Value [none][none]仅从指定文件读取默认选项。Read default options from given file only.
命令行格式Command-Line Format --defaults-group-suffix=string类型Type 字符串String 默认值Default Value [none][none]也读取组合了 concat(group, suffix) 的组。Also read groups with concat(group, suffix).
命令行格式Command-Line Format --help--help显示帮助文本并退出。Display help text and exit.
命令行格式Command-Line Format --login-path=path类型Type 字符串String 默认值Default Value [none][none]从登录文件读取给定路径。Read given path from login file.
命令行格式Command-Line Format --no-login-paths跳过从登录路径文件读取选项。Skips reading options from the login path file.
命令行格式Command-Line Format --ndb-connectstring=connection_string类型Type 字符串String 默认值Default Value [none][none]设置用于连接到 ndb_mgmd 的连接字符串。语法：
[nodeid=。覆盖id;][host=]hostname[:port]NDB_CONNECTSTRING和my.cnf中的条目。Set connection string for connecting to ndb_mgmd. Syntax:[nodeid=. Overrides entries inid;][host=]hostname[:port]NDB_CONNECTSTRINGandmy.cnf.命令行格式Command-Line Format --ndb-mgm-tls=level类型Type 枚举Enumeration 默认值Default Value relaxedrelaxed有效值Valid Values relaxedrelaxedstrictstrict设置连接到管理服务器所需的 TLS 支持级别；可以是
relaxed或strict。relaxed（默认）表示尝试建立 TLS 连接，但不要求成功；strict表示连接必须使用 TLS。Sets the level of TLS support required to connect to the management server; one ofrelaxedorstrict.relaxed(the default) means that a TLS connection is attempted, but success is not required;strictmeans that TLS is required to connect.命令行格式Command-Line Format --ndb-mgmd-host=connection_string类型Type 字符串String 默认值Default Value [none][none]同
--ndb-connectstring。Same as--ndb-connectstring.命令行格式Command-Line Format --ndb-nodeid=#类型Type 整数Integer 默认值Default Value [none][none]为此节点设置节点 ID，覆盖由
--ndb-connectstring设置的任何 ID。Set node ID for this node, overriding any ID set by--ndb-connectstring.--ndb-optimized-node-selection命令行格式Command-Line Format --ndb-optimized-node-selection启用事务节点选择的优化。默认启用；使用
--skip-ndb-optimized-node-selection来禁用。Enable optimizations for selection of nodes for transactions. Enabled by default; use--skip-ndb-optimized-node-selectionto disable.命令行格式Command-Line Format --ndb-tls-search-path=list类型Type 路径名Path name 默认值（Unix）Default Value (Unix) $HOME/ndb-tls$HOME/ndb-tls默认值（Windows）Default Value (Windows) $HOMEDIR/ndb-tls指定用于搜索 CA 文件的目录列表。在 Unix 平台上，目录名称用冒号 (
:) 分隔；在 Windows 系统上，使用分号 (;) 作为分隔符。目录引用可以是相对路径或绝对路径；它可以包含一个或多个环境变量，每个变量以美元符号 ($) 开头，并在使用前进行展开。Specify a list of directories to search for a CA file. On Unix platforms, the directory names are separated by colons (:); on Windows systems, the semicolon character (;) is used as the separator. A directory reference may be relative or absolute; it may contain one or more environment variables, each denoted by a prefixed dollar sign ($), and expanded prior to use.搜索从最左边的命名目录开始，按从左到右的顺序进行，直到找到文件。空字符串表示空搜索路径，这会导致所有搜索失败。由单个点 (
.) 组成的字符串表示搜索路径仅限于当前工作目录。Searching begins with the leftmost named directory and proceeds from left to right until a file is found. An empty string denotes an empty search path, which causes all searches to fail. A string consisting of a single dot (.) indicates that the search path limited to the current working directory.如果未提供搜索路径，则使用编译时的默认值。此值取决于所使用的平台：在 Windows 上，它是
\ndb-tls；在其他平台（包括 Linux）上，它是$HOME/ndb-tls。可以通过使用-DWITH_NDB_TLS_SEARCH_PATH编译 NDB Cluster 来覆盖该值。If no search path is supplied, the compiled-in default value is used. This value depends on the platform used: On Windows, this is\ndb-tls; on other platforms (including Linux), it is$HOME/ndb-tls. This can be overridden by compiling NDB Cluster using-DWITH_NDB_TLS_SEARCH_PATH.命令行格式Command-Line Format --no-defaults--no-defaults除了登录文件之外，不从任何配置文件读取默认选项。Do not read default options from any option file other than login file.
命令行格式Command-Line Format --print-defaults打印程序参数列表然后退出。Print program argument list and exit.
命令行格式Command-Line Format --usage显示帮助文本并退出；与
--help相同。Display help text and exit; same as--help.命令行格式Command-Line Format --version显示版本信息并退出。Display version information and exit.