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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4590) You can drop a file-system database from a directory named "memory"
Date Thu, 18 Mar 2010 14:26:28 GMT
You can drop a file-system database from a directory named "memory"
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                 Key: DERBY-4590
                 URL: https://issues.apache.org/jira/browse/DERBY-4590
             Project: Derby
          Issue Type: Bug
          Components: JDBC, Services, Store
    Affects Versions: 10.6.0.0
            Reporter: Kim Haase
            Priority: Minor


With both the embedded and network client drivers, it is possible to create a file-system
database and drop it, if you put it in a directory named "memory". 

I found this out by accident when I accidentally typed "memory/mydb" instead of "memory:mydb"
to create an in-memory database.

If you call the directory something other than "memory", you can't drop the db:

ij> connect 'jdbc:derby://localhost:1527/subdir/mycdb;create=true';
ij> create table t(c int);
0 rows inserted/updated/deleted
ij> connect 'jdbc:derby://localhost:1527/subdir/mycdb;drop=true';
ERROR XBM0I: DERBY SQL error: SQLCODE: -1, SQLSTATE: XBM0I, SQLERRMC: Directory subdir/mycdb
cannot be removed.

But if you do exactly the same thing specifying "memory", the drop succeeds:

ij> connect 'jdbc:derby://localhost:1527/memory/mycdb;create=true';
ij> create table t(c int);
0 rows inserted/updated/deleted
ij> connect 'jdbc:derby://localhost:1527/memory/mycdb;drop=true';
ERROR 08006: DERBY SQL error: SQLCODE: -1, SQLSTATE: 08006, SQLERRMC: Database 'memory/mycdb'
dropped.

When you do this, the "memory" directory continues to exist, but the database directory under
it is removed.

Here are similar examples using the embedded driver:

ij>  connect 'jdbc:derby:subdir/mydb;create=true';
ij> create table t(c int);
0 rows inserted/updated/deleted
ij> connect 'jdbc:derby:subdir/mydb;drop=true';
ERROR XBM0I: Directory subdir/mydb cannot be removed.

ij> connect 'jdbc:derby:memory/mydb;create=true';
ij> create table t(c int);
0 rows inserted/updated/deleted
ij> connect 'jdbc:derby:memory/mydb;drop=true';
ERROR 08006: Database 'memory/mydb' dropped.

Some part of Derby seems to think you actually created an in-memory database, although you
did not.

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