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MySQL NDB Cluster 8.0  /  NDB Cluster Programs  /  ndb_drop_index — Drop Index from an NDB Table

6.10 ndb_drop_index — Drop Index from an NDB Table

ndb_drop_index drops the specified index from an NDB table. It is recommended that you use this utility only as an example for writing NDB API applications—see the Warning later in this section for details.

Usage

ndb_drop_index -c connection_string table_name index -d db_name

The statement shown above drops the index named index from the table in the database.

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

Table 6.9 Command-line options used with the program ndb_drop_index

Format Description Added, Deprecated, or Removed

--character-sets-dir=path

Directory containing character sets

(Supported in all NDB releases based on MySQL 8.0)

--connect-retries=#

Number of times to retry connection before giving up

(Supported in all NDB releases based on MySQL 8.0)

--connect-retry-delay=#

Number of seconds to wait between attempts to contact management server

(Supported in all NDB releases based on MySQL 8.0)

--connect-string=connection-string,

-c

Same as --ndb-connectstring

(Supported in all NDB releases based on MySQL 8.0)

--core-file

Write core file on error; used in debugging

(Supported in all NDB releases based on MySQL 8.0)

--database=dbname,

-d

Name of database in which table is found

(Supported in all NDB releases based on MySQL 8.0)

--defaults-extra-file=path

Read given file after global files are read

(Supported in all NDB releases based on MySQL 8.0)

--defaults-file=path

Read default options from given file only

(Supported in all NDB releases based on MySQL 8.0)

--defaults-group-suffix=string

Also read groups with concat(group, suffix)

(Supported in all NDB releases based on MySQL 8.0)

--help,

-?

Display help text and exit

(Supported in all NDB releases based on MySQL 8.0)

--login-path=path

Read given path from login file

(Supported in all NDB releases based on MySQL 8.0)

--ndb-connectstring=connection-string,

-c

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 8.0)

--ndb-mgmd-host=connection-string,

-c

Same as --ndb-connectstring

(Supported in all NDB releases based on MySQL 8.0)

--ndb-nodeid=#

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

(Supported in all NDB releases based on MySQL 8.0)

--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 8.0)

--no-defaults

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

(Supported in all NDB releases based on MySQL 8.0)

--print-defaults

Print program argument list and exit

(Supported in all NDB releases based on MySQL 8.0)

--usage,

-?

Display help text and exit; same as --help

(Supported in all NDB releases based on MySQL 8.0)

--version,

-V

Display version information and exit

(Supported in all NDB releases based on MySQL 8.0)


  • --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.

  • --database, -d

    Command-Line Format --database=dbname
    Type String
    Default Value TEST_DB

    Name of the database in which the table resides.

  • --defaults-extra-file

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

    Read given file after global files are read.

  • --defaults-file

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

    Read default options from given file only.

  • --defaults-group-suffix

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

    Also read groups with concat(group, suffix).

  • --help

    Command-Line Format --help

    Display help text and exit.

  • --login-path

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

    Read given path from login file.

  • --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-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.

  • --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.

Warning

Operations performed on Cluster table indexes using the NDB API are not visible to MySQL and make the table unusable by a MySQL server. If you use this program to drop an index, then try to access the table from an SQL node, an error results, as shown here:

shell> ./ndb_drop_index -c localhost dogs ix -d ctest1
Dropping index dogs/idx...OK
NDBT_ProgramExit: 0 - OK
shell> ./mysql -u jon -p ctest1
Enter password: *******
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7 to server version: 5.7.33-ndb-7.5.23
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> SHOW TABLES;
+------------------+
| Tables_in_ctest1 |
+------------------+
| a                |
| bt1              |
| bt2              |
| dogs             |
| employees        |
| fish             |
+------------------+
6 rows in set (0.00 sec)
mysql> SELECT * FROM dogs;
ERROR 1296 (HY000): Got error 4243 'Index not found' from NDBCLUSTER

In such a case, your only option for making the table available to MySQL again is to drop the table and re-create it. You can use either the SQL statementDROP TABLE or the ndb_drop_table utility (see Section 6.11, “ndb_drop_table — Drop an NDB Table”) to drop the table.