NDB_DROP_INDEX(1)

NAME
ndb_drop_index - drop index from an NDB table

SYNOPSIS

ndb_drop_index options

DESCRIPTION

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.

    • --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=name
    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.

    • --no-login-paths
    Command-Line Format | --no-login-paths

    Skips reading options from the login path file.

    • --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.

    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:

    $> ./ndb_drop_index -c localhost dogs ix -d ctest1
    Dropping index dogs/idx...OK
    $> ./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: 5.7.44-ndb-7.5.36
    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 ndb_drop_table(1)) to drop the table.

COPYRIGHT

Copyright © 1997, 2025, Oracle and/or its affiliates.

This documentation is free software; you can redistribute it and/or modify it only under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License.

This documentation is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with the program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or see http://www.gnu.org/licenses/.

SEE ALSO
For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online at http://dev.mysql.com/doc/.

AUTHOR
Oracle Corporation (http://dev.mysql.com/).