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MySQL 9.2 Reference Manual  / ...  / MySQL NDB Cluster 9.2  / NDB Cluster Programs  /  ndb_drop_index — Drop Index from an NDB Table

25.5.10 ndb_drop_index — Drop Index from an NDB Table

ndb_drop_index drops the specified index from anNDB 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 -cconnection_stringtable_nameindex -ddb_name

The statement shown above drops the index namedindex from thetable in thedatabase.

Options that can be used withndb_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=#
    TypeInteger
    Default Value12
    Minimum Value0
    Maximum Value12

    Number of times to retry connection before giving up.

  • --connect-retry-delay

    Command-Line Format--connect-retry-delay=#
    TypeInteger
    Default Value5
    Minimum Value0
    Maximum Value5

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

  • --connect-string

    Command-Line Format--connect-string=connection_string
    TypeString
    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
    TypeString
    Default ValueTEST_DB

    Name of the database in which the table resides.

  • --defaults-extra-file

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

    Read given file after global files are read.

  • --defaults-file

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

    Read default options from given file only.

  • --defaults-group-suffix

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

    Set connection string for connecting tondb_mgmd. Syntax:[nodeid=id;][host=]hostname[:port]. Overrides entries inNDB_CONNECTSTRING andmy.cnf.

  • --ndb-mgm-tls

    Command-Line Format--ndb-mgm-tls=level
    TypeEnumeration
    Default Valuerelaxed
    Valid Values

    relaxed

    strict

    Sets the level of TLS support required to connect to the management server; one ofrelaxed orstrict.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
    TypeString
    Default Value[none]

    Same as--ndb-connectstring.

  • --ndb-nodeid

    Command-Line Format--ndb-nodeid=#
    TypeInteger
    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
    TypePath 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:

$> ./ndb_drop_index -c localhost dogs ix -d ctest1Dropping index dogs/idx...OK$> ./mysql -u jon -p ctest1Enter password: *******Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -AWelcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 7 to server version: 5.7.44-ndb-7.5.36Type '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, youronly 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 thendb_drop_table utility (seeSection 25.5.11, “ndb_drop_table — Drop an NDB Table”) to drop the table.