MySQL :: MySQL 8.4 Reference Manual :: 25.5.26 ndb_select_count

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MySQL 8.4 Reference Manual / ... / ndb_select_count — Print Row Counts for NDB Tables

25.5.26 ndb_select_count — Print Row Counts for NDB 表

ndb_select_count prints the number of rows in one or more NDB tables. With a single table, the result is equivalent to that obtained by using the MySQL statement SELECT COUNT(*) FROM tbl_name.

ndb_select_count [-c connection_string] -ddb_name tbl_name[, tbl_name2[, ...]]

Options that can be used with ndb_select_count are shown in the following table. Additional descriptions follow the table.

--character-sets-dir

Command-Line Format	`--character-sets-dir=path`

Directory containing character sets.

--connect-retries

Command-Line Format	`--connect-retries=#`
Type	Integer
Default Value	`12`
Minimum Value	`0`
Maximum Value	`12`

Number of times to retry connection before giving up.

--connect-retry-delay

Command-Line Format	`--connect-retry-delay=#`
Type	Integer
Default Value	`5`
Minimum Value	`0`
Maximum Value	`5`

Number of seconds to wait between attempts to contact management server.

--connect-string

Command-Line Format	`--connect-string=connection_string`
Type	String
Default Value	`[none]`

Same as --ndb-connectstring.

--core-file

Command-Line Format	`--core-file`

Write core file on error; used in debugging.

--defaults-file

Command-Line Format	`--defaults-file=path`
Type	String
Default Value	`[none]`

Read default options from given file only.

--defaults-extra-file

Command-Line Format	`--defaults-extra-file=path`
Type	String
Default Value	`[none]`

Read given file after global files are read.

--defaults-group-suffix

Command-Line Format	`--defaults-group-suffix=string`
Type	String
Default Value	`[none]`

Also read groups with concat(group, suffix).

--login-path

Command-Line Format	`--login-path=path`
Type	String
Default Value	`[none]`

Read given path from login file.

--no-login-paths

Command-Line Format	`--no-login-paths`

Skips reading options from the login path file.

--help

Command-Line Format	`--help`

Display help text and exit.

--ndb-connectstring

Command-Line Format	`--ndb-connectstring=connection_string`
Type	String
Default Value	`[none]`

Set connection string for connecting to ndb_mgmd. Syntax: [nodeid=id;][host=]hostname[:port]. Overrides entries in NDB_CONNECTSTRING and my.cnf.

--ndb-mgm-tls

Command-Line Format	`--ndb-mgm-tls=level`
Type	Enumeration
Default Value	`relaxed`
Valid Values	`relaxed` `strict`

Sets the level of TLS support required to connect to the management server; one of relaxed or strict. relaxed (the default) means that a TLS connection is attempted, but success is not required; strict means that TLS is required to connect.

--ndb-mgmd-host

Command-Line Format	`--ndb-mgmd-host=connection_string`
Type	String
Default Value	`[none]`

Same as --ndb-connectstring.

--ndb-nodeid

Command-Line Format	`--ndb-nodeid=#`
Type	Integer
Default Value	`[none]`

Set node ID for this node, overriding any ID set by --ndb-connectstring.

--ndb-optimized-node-selection

Command-Line Format	`--ndb-optimized-node-selection`

Enable optimizations for selection of nodes for transactions. Enabled by default; use --skip-ndb-optimized-node-selection to disable.

--ndb-tls-search-path

Command-Line Format	`--ndb-tls-search-path=list`
Type	Path name
Default Value (Unix)	`$HOME/ndb-tls`
Default Value (Windows)	`$HOMEDIR/ndb-tls`

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.

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.

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.

--no-defaults

Command-Line Format	`--no-defaults`

Do not read default options from any option file other than login file.

--print-defaults

Command-Line Format	`--print-defaults`

Print program argument list and exit.

--usage

Command-Line Format	`--usage`

Display help text and exit; same as --help.

--version

Command-Line Format	`--version`

Display version information and exit.

You can obtain row counts from multiple tables in the same database by listing the table names separated by spaces when invoking this command, as shown under Sample Output.

$> ./ndb_select_count -c localhost -d ctest1 fish dogs
6 records in table fish
4 records in table dogs

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