MySQL indexing compared to SQL Server

Does MySQL have a sysindexes table or am I just thinking of SQL Server? If not, is there 开发者_如何学Goan equivalent indexing feature within MySQL at all?

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SYS tables are specifically SQL Server; the ANSI equivalent is INFORMATION_SCHEMA. Part of the reason SYS tables still exist on SQL Server is they sometimes include additional information not in the INFORMATION_SCHEMA tables...

On MySQL, you want to use INFORMATION_SCHEMA.STATISTICS:

SELECT * 
  FROM INFORMATION_SCHEMA.STATISTICS
 WHERE table_name = 'tbl_name'
   AND table_schema = 'db_name'

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InnoDB tables can definitely be indexed; not sure about the scope available with ISAM tables. The system information stuff is held in the information schema tables:

http://dev.mysql.com/doc/refman/5.0/en/schemata-table.html