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DESC sys.schema_redundant_indexes;
Field Type Null Key Default Extra
table_schema varchar(64) NO NULL
table_name varchar(64) NO NULL
redundant_index_name varchar(64) NO NULL
redundant_index_columns mediumtext YES NULL
redundant_index_non_unique bigint(1) YES NULL
dominant_index_name varchar(64) NO NULL
dominant_index_columns mediumtext YES NULL
dominant_index_non_unique bigint(1) YES NULL
subpart_exists int(1) YES NULL
sql_drop_index varchar(223) YES NULL
SELECT * FROM sys.schema_redundant_indexes;
DESC sys.x$schema_flattened_keys;
Field Type Null Key Default Extra
table_schema varchar(64) NO NULL
table_name varchar(64) NO NULL
index_name varchar(64) NO NULL
non_unique bigint(1) YES NULL
subpart_exists bigint(1) YES NULL
index_columns mediumtext YES NULL
SELECT * FROM sys.x$schema_flattened_keys;
CREATE DATABASE rkey;
CREATE TABLE rkey.rkey (
i INT,
j INT,
k INT,
PRIMARY KEY (i),
KEY (j),
KEY (j, k),
KEY (i, j, k)
);
SELECT * FROM sys.schema_redundant_indexes;
table_schema table_name redundant_index_name redundant_index_columns redundant_index_non_unique dominant_index_name dominant_index_columns dominant_index_non_unique subpart_exists sql_drop_index
rkey rkey i i,j,k 1 PRIMARY i 0 0 ALTER TABLE `rkey`.`rkey` DROP INDEX `i`
rkey rkey j j 1 j_2 j,k 1 0 ALTER TABLE `rkey`.`rkey` DROP INDEX `j`
DROP DATABASE rkey;
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