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 23.32. Command−line options used with the program ndb_drop_index
Directory containing character sets.
Number of times to retry connection before giving up.
Number of seconds to wait between attempts to contact management server.
Same as −−ndb−connectstring.
Write core file on error; used in debugging.
• −−database, −d
Name of the database in which the table resides.
Read given file after global files are read.
Read default options from given file only.
Also read groups with concat(group, suffix).
Display help text and exit.
Read given path from login file.
Set connect string for connecting to ndb_mgmd. Syntax: "[nodeid=id;][host=]hostname[:port]". Overrides entries in NDB_CONNECTSTRING and my.cnf.
Same as −−ndb−connectstring.
Set node ID for this node, overriding any ID set by −−ndb−connectstring.
Enable optimizations for selection of nodes for transactions. Enabled by default; use −−skip−ndb−optimized−node−selection to disable.
Do not read default options from any option file other than login file.
Print program argument list and exit.
Display help text and exit; same as −−help.
Display version information and exit.
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
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: 5.7.35−ndb−7.5.24
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.
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