21.4.11 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.
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
The following table includes options that are specific to ndb_drop_index. Additional descriptions follow the table. For options common to most NDB Cluster programs (including ndb_drop_index), see Section 21.4.32, “Options Common to NDB Cluster Programs — Options Common to NDB Cluster Programs”.
Table 21.247 Command-line options for the ndb_drop_index program
|Format||Description||Added, Deprecated, or Removed|
||Name of database in which table is found||
(Supported in all MySQL 5.7 based releases)
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: 5.7.31-ndb-7.5.20 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 statement
DROP TABLE or the ndb_drop_table utility (see Section 21.4.12, “ndb_drop_table — Drop an NDB Table”) to drop the table.