21.5.26 ndb_select_count — Print Row Counts for NDB Tables

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.

Usage

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.

Table 21.42 Command-line options used with the program ndb_select_count

Format	Description	Added, Deprecated, or Removed
--character-sets-dir=path	Directory containing character sets	(Supported in all NDB releases based on MySQL 5.7)
--connect-retries=#	Number of times to retry connection before giving up	(Supported in all NDB releases based on MySQL 5.7)
--connect-retry-delay=#	Number of seconds to wait between attempts to contact management server	(Supported in all NDB releases based on MySQL 5.7)
--connect-string=connection_string, -c connection_string	Same as --ndb-connectstring	(Supported in all NDB releases based on MySQL 5.7)
--core-file	Write core file on error; used in debugging	(Supported in all NDB releases based on MySQL 5.7)
--database=name, -d name	Name of database in which table is found	(Supported in all NDB releases based on MySQL 5.7)
--defaults-extra-file=path	Read given file after global files are read	(Supported in all NDB releases based on MySQL 5.7)
--defaults-file=path	Read default options from given file only	(Supported in all NDB releases based on MySQL 5.7)
--defaults-group-suffix=string	Also read groups with concat(group, suffix)	(Supported in all NDB releases based on MySQL 5.7)
--help, -?	Display help text and exit	(Supported in all NDB releases based on MySQL 5.7)
--lock=#, -l #	Lock type	(Supported in all NDB releases based on MySQL 5.7)
--login-path=path	Read given path from login file	(Supported in all NDB releases based on MySQL 5.7)
--ndb-connectstring=connection_string, -c connection_string	Set connect string for connecting to ndb_mgmd. Syntax: "[nodeid=id;][host=]hostname[:port]". Overrides entries in NDB_CONNECTSTRING and my.cnf	(Supported in all NDB releases based on MySQL 5.7)
--ndb-mgmd-host=connection_string, -c connection_string	Same as --ndb-connectstring	(Supported in all NDB releases based on MySQL 5.7)
--ndb-nodeid=#	Set node ID for this node, overriding any ID set by --ndb-connectstring	(Supported in all NDB releases based on MySQL 5.7)
--ndb-optimized-node-selection	Enable optimizations for selection of nodes for transactions. Enabled by default; use --skip-ndb-optimized-node-selection to disable	(Supported in all NDB releases based on MySQL 5.7)
--no-defaults	Do not read default options from any option file other than login file	(Supported in all NDB releases based on MySQL 5.7)
--parallelism=#, -p #	Degree of parallelism	(Supported in all NDB releases based on MySQL 5.7)
--print-defaults	Print program argument list and exit	(Supported in all NDB releases based on MySQL 5.7)
--usage, -?	Display help text and exit; same as --help	(Supported in all NDB releases based on MySQL 5.7)
--version, -V	Display version information and exit	(Supported in all NDB releases based on MySQL 5.7)

• --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.

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

• --ndb-mgmd-host

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

  Same as --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-nodeid

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

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

• --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.

Sample Output

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

NDBT_ProgramExit: 0 - OK