@@ -1588,6 +1588,8 @@ The following file systems are included:
To work around this limitation, combine it with the split file system: <code>split:nioMapped:test</code>.
</li><li><code>memFS:</code> in-memory file system (slower than mem; experimental; mainly used for testing the database engine itself).
</li><li><code>memLZF:</code> compressing in-memory file system (slower than memFS but uses less memory; experimental; mainly used for testing the database engine itself).
</li><li><code>nioMemFS:</code> stores data outside of the VM's heap - useful for large memory DBs without incurring GC costs.
</li><li><code>nioMemLZF:</code> stores compressed data outside of the VM's heap - useful for large memory DBs without incurring GC costs.
</li></ul>
<p>
As an example, to use the the <code>nio</code> file system, use the following database URL:
stat.execute("INSERT INTO TBL_A (name) SELECT 'package_' || CAST(X as VARCHAR) FROM SYSTEM_RANGE(1, 100) WHERE X <= 100");
stat.execute("INSERT INTO TBL_B (tbl_a_id, createDate) SELECT CASE WHEN tbl_a_id = 0 THEN 1 ELSE tbl_a_id END, createDate FROM ( SELECT ROUND((RAND() * 100)) AS tbl_a_id, DATEADD('SECOND', X, NOW()) as createDate FROM SYSTEM_RANGE(1, 50000) WHERE X < 50000 )");
stat.execute("CREATE INDEX tbl_b_idx ON tbl_b(tbl_a_id, id)");
stat.execute("ANALYZE");
ResultSetrs=stat.executeQuery("EXPLAIN ANALYZE SELECT MAX(b.id) as id FROM tbl_b b JOIN tbl_a a ON b.tbl_a_id = a.id GROUP BY b.tbl_a_id HAVING A.ACTIVE = TRUE");
> SELECT TEST1.ID, TEST2.ID, TEST3.ID FROM PUBLIC.TEST1 /* PUBLIC.TEST1.tableScan */ INNER JOIN PUBLIC.TEST2 /* PUBLIC.PRIMARY_KEY_4C: ID = TEST1.ID AND ID = TEST1.ID */ ON 1=1 /* WHERE TEST1.ID = TEST2.ID */ LEFT OUTER JOIN PUBLIC.TEST3 /* PUBLIC.PRIMARY_KEY_4C0: ID = TEST2.ID */ ON TEST2.ID = TEST3.ID WHERE (TEST3.ID IS NULL) AND (TEST1.ID = TEST2.ID)
> SELECT TEST1.ID, TEST2.ID, TEST3.ID FROM PUBLIC.TEST2 /* PUBLIC.TEST2.tableScan */ LEFT OUTER JOIN PUBLIC.TEST3 /* PUBLIC.PRIMARY_KEY_4C0: ID = TEST2.ID */ ON TEST2.ID = TEST3.ID INNER JOIN PUBLIC.TEST1 /* PUBLIC.PRIMARY_KEY_4: ID = TEST2.ID */ ON 1=1 WHERE (TEST3.ID IS NULL) AND (TEST1.ID = TEST2.ID)
> rows: 1
insert into test1 select x from system_range(2, 1000);
...
...
@@ -6203,6 +6203,12 @@ SELECT * FROM TEST UNION ALL SELECT * FROM TEST ORDER BY ID LIMIT 2+0 OFFSET 1+0
> 2 World
> rows (ordered): 2
SELECT * FROM TEST ORDER BY ID OFFSET 4;
> ID NAME
> -- ---------
> 5 resources
> rows (ordered): 1
SELECT ID FROM TEST GROUP BY ID UNION ALL SELECT ID FROM TEST GROUP BY ID;
