Creating Indexes on DB with Hibernate @Index Annotation

Question

I have annotation-driven hibernate capabilies on my project.

Now I want to create an index over a column. My current column definition is

@NotNull
@Column(name = "hash")
private String hash;

and I add @Index annotation here.

@NotNull
@Column(name = "hash")
@Index(name="hashIndex")
private String hash;

and then DROP TABLE and restart Tomcat server. After the server is instantiated, the table is created but I can't see new index on following query.

SHOW INDEX FROM tableName

It is expected to construct table with new index. I am using InnoDB with MySQL.

Answer 1

Interestingly, in my Hibernate configuration I was using hibernate.hbm2ddl.auto=update.

This one modifies an existing database. I was manually DROPping the table tableName and restarting Tomcat and the table had been constructed but index was not being created.

However, I made hibernate.hbm2ddl.auto=create which re-creates database upon each instantiation of webapp, it dropped all my database and rebuilt back and -hell yeah- my new index has been created!