How do I see if my database has any indexes on it?
How about for a specific table?
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To see the index for a specific table use SHOW INDEX:
SHOW INDEX FROM yourtable;
To see indexes for all tables within a specific schema you can use the STATISTICS table from INFORMATION_SCHEMA:
SELECT DISTINCT TABLE_NAME, INDEX_NAME FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA = 'your_schema';
Removing the where clause will show you all indexes in all schemas.
If you want to see all indexes across all databases all at once:
use information_schema; SELECT * FROM statistics;
SHOW INDEX FROM mytable FROM mydb; SHOW INDEX FROM mydb.mytable;
You could use this query to get the no of indexes as well as the index names of each table in specified database.
SELECT TABLE_NAME, COUNT(1) index_count, GROUP_CONCAT(DISTINCT(index_name) SEPARATOR ',n ') indexes FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA = 'mydb' AND INDEX_NAME != 'primary' GROUP BY TABLE_NAME ORDER BY COUNT(1) DESC;
to see indexes you have created use
SHOW INDEX from your_table_name;
to see all indexes on a table ( created by DB and you)
SHOW EXTENDED INDEX from your_table_name;
To get all indexed columns per index in one column in the sequence order.
SELECT table_name AS `Table`, index_name AS `Index`, GROUP_CONCAT(column_name ORDER BY seq_in_index) AS `Columns` FROM information_schema.statistics WHERE table_schema = 'sakila' GROUP BY 1,2;
show create table myTable ?
Someone told me this but I didn’t see anyone mention here, anything bad?
It’s neat if you just want to take a glance at the indexes along with column infomations.
I propose this query:
SELECT DISTINCT s.* FROM INFORMATION_SCHEMA.STATISTICS s LEFT OUTER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS t ON t.TABLE_SCHEMA = s.TABLE_SCHEMA AND t.TABLE_NAME = s.TABLE_NAME AND s.INDEX_NAME = t.CONSTRAINT_NAME WHERE 0 = 0 AND t.CONSTRAINT_NAME IS NULL AND s.TABLE_SCHEMA = 'YOUR_SCHEMA_SAMPLE';
You found all Index only index.
This works in my case for getting table name and column name in the corresponding table for indexed fields.
SELECT TABLE_NAME , COLUMN_NAME, COMMENT FROM information_schema.statistics WHERE table_schema = 'database_name';
To check all disabled indexes on db
SELECT INDEX_SCHEMA, COLUMN_NAME, COMMENT FROM information_schema.statistics WHERE table_schema = 'mydb' AND COMMENT = 'disabled'
You can check your indexes in MySQL workbench.under the performance reports tabs you can see all used indexes and unused indexes on the system. or you can fire the query.
select * from sys.schema_index_statistics;
To query the index information of a table, you use the SHOW INDEXES statement as follows:
SHOW INDEXES FROM table_name;
You can specify the database name if you are not connected to any database or you want to get the index information of a table in a different database:
SHOW INDEXES FROM table_name IN database_name;
The following query is similar to the one above:
SHOW INDEXES FROM database_name.table_name;
Note that INDEX and KEYS are the synonyms of the INDEXES, IN is the synonym of the FROM, therefore, you can use these synonyms in the SHOW INDEXES column instead. For example:
SHOW INDEX IN table_name FROM database_name;
SHOW KEYS FROM tablename IN databasename;
we can directly see the indexes on to the table if we know the index name with below :
select * from all_indexes where index_name= ‘your index’
select table_name, index_name, seq_in_index, column_name, non_unique, index_type, comment from information_schema.statistics where 1=1 and table_schema = 'my_schema' and table_name = 'my_table' order by 1,2,3,4,5,6