defragment of inplace compress pass for described dataset is not freeing up
empty pages.
----------------------------------------------------------------------------------------
Key: DERBY-1187
URL: http://issues.apache.org/jira/browse/DERBY-1187
Project: Derby
Type: Bug
Versions: 10.1.1.0, 10.1.1.1, 10.1.1.2, 10.1.2.0, 10.1.2.1, 10.1.2.2,
10.1.2.3, 10.2.0.0
Reporter: Mike Matrigali
Priority: Minor
Fix For: 10.2.0.0
For the following script defragement pass is not freeing up the free pages:
drop table t1;
create table t1 (i integer primary key, j integer, c char(200));
insert into t1 values (1, 1, 'a');
insert into t1 (select t1.i + 1, t1.j + 1, t1.c from t1);
insert into t1 (select t1.i + 2, t1.j + 2, t1.c from t1);
insert into t1 (select t1.i + 4, t1.j + 4, t1.c from t1);
insert into t1 (select t1.i + 8, t1.j + 8, t1.c from t1);
insert into t1 (select t1.i + 16, t1.j + 16, t1.c from t1);
insert into t1 (select t1.i + 32, t1.j + 32, t1.c from t1);
insert into t1 (select t1.i + 64, t1.j + 64, t1.c from t1);
insert into t1 (select t1.i + 128, t1.j + 128, t1.c from t1);
insert into t1 (select t1.i + 256, t1.j + 256, t1.c from t1);
insert into t1 (select t1.i + 512, t1.j + 512, t1.c from t1);
delete from t1 where i < 512;
select
cast(conglomeratename as char(12)) as tabname,
isindex,
cast(numallocatedpages as int) as alloc,
numfreepages,
cast(numunfilledpages as int) as unfilled,
pagesize,
estimspacesaving
from new org.apache.derby.diag.SpaceTable('T1') t order by conglomeratename;
CALL SYSCS_UTIL.SYSCS_INPLACE_COMPRESS_TABLE('APP', 'T1', 1, 1, 1);
select
cast(conglomeratename as char(12)) as tabname,
isindex,
cast(numallocatedpages as int) as alloc,
numfreepages,
cast(numunfilledpages as int) as unfilled,
pagesize,
estimspacesaving
from new org.apache.derby.diag.SpaceTable('T1') t order by conglomeratename;
select
cast(conglomeratename as char(12)) as tabname,
isindex,
cast(numallocatedpages as int) as alloc,
numfreepages,
cast(numunfilledpages as int) as unfilled,
pagesize,
estimspacesaving
from new org.apache.derby.diag.SpaceTable('T1') t order by conglomeratename;
Here is example output from a run on the trunk:
ij> drop table t1;
0 rows inserted/updated/deleted
ij> create table t1 (i integer primary key, j integer, c char(200));
0 rows inserted/updated/deleted
ij> insert into t1 values (1, 1, 'a');
1 row inserted/updated/deleted
ij> insert into t1 (select t1.i + 1, t1.j + 1, t1.c from t1);
1 row inserted/updated/deleted
ij> insert into t1 (select t1.i + 2, t1.j + 2, t1.c from t1);
2 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 4, t1.j + 4, t1.c from t1);
4 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 8, t1.j + 8, t1.c from t1);
8 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 16, t1.j + 16, t1.c from t1);
16 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 32, t1.j + 32, t1.c from t1);
32 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 64, t1.j + 64, t1.c from t1);
64 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 128, t1.j + 128, t1.c from t1);
128 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 256, t1.j + 256, t1.c from t1);
256 rows inserted/updated/deleted
ij> insert into t1 (select t1.i + 512, t1.j + 512, t1.c from t1);
512 rows inserted/updated/deleted
ij> delete from t1 where i < 512;
511 rows inserted/updated/deleted
ij> select
cast(conglomeratename as char(12)) as tabname,
isindex,
cast(numallocatedpages as int) as alloc,
numfreepages,
cast(numunfilledpages as int) as unfilled,
pagesize,
estimspacesaving
from new org.apache.derby.diag.SpaceTable('T1') t order by conglomeratename;
TABNAME |ISIND&|ALLOC |NUMFREEPAGES |UNFILLED |PAGESIZE |EST
IMSPACESAVING
--------------------------------------------------------------------------------
-----------------
SQL060406034|1 |7 |0 |0 |4096 |0
T1 |0 |60 |9 |0 |4096 |368
64
2 rows selected
ij> CALL SYSCS_UTIL.SYSCS_INPLACE_COMPRESS_TABLE('APP', 'T1', 1, 1, 1);
0 rows inserted/updated/deleted
ij> select
cast(conglomeratename as char(12)) as tabname,
isindex,
cast(numallocatedpages as int) as alloc,
numfreepages,
cast(numunfilledpages as int) as unfilled,
pagesize,
estimspacesaving
from new org.apache.derby.diag.SpaceTable('T1') t order by conglomeratename;
TABNAME |ISIND&|ALLOC |NUMFREEPAGES |UNFILLED |PAGESIZE |EST
IMSPACESAVING
--------------------------------------------------------------------------------
-----------------
SQL060406034|1 |7 |0 |1 |4096 |0
T1 |0 |69 |0 |0 |4096 |0
2 rows selected
ij>
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