Split 4k monitor into two "virtual monitors"?

Hi all,
I'm thinking of buying a 4k monitor to replace a dual-screen setup. However, I like the functionality of having two things maximised at once. Is there any way to set up X so that it sees the 4k 3840x2160 monitor as two separate 1920x2160 monitors? That way, maximising an application would only take up half of the physical screen and the taskbar would only appear on one half.
Thanks!
Last edited by Tom B (2014-06-04 12:15:13)

You might want to look into fakexrandr or try a tiling window manager.

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Message was edited by:
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WARNING! There is a bug in the code, see EDIT: at bottom of post for details
Justin,
It makes sense that Oracle could order over rowid without sorting, but I see a sort in the explain plan:
SQL> create table t as select 1 as data
2 from all_objects
3 where rownum <= 100000;
Table created.
SQL> explain plan for select *
2 from (select t.*, row_number() over (order by rowid) rn from t)
3 where rn < 50000;
Explained.
SQL> select * from table(DBMS_XPLAN.DISPLAY);
PLAN_TABLE_OUTPUT
Plan hash value: 327232321
| Id | Operation                | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT         |      | 99651 | 2530K|       |   489   (3)| 00:00:07 |
|* 1 | VIEW                    |      | 99651 | 2530K|       |   489   (3)| 00:00:07 |
|* 2 |   WINDOW SORT PUSHED RANK|      | 99651 | 2432K| 7056K|   489   (3)| 00:00:07 |
|   3 |    TABLE ACCESS FULL     | T    | 99651 | 2432K|       |    31   (7)| 00:00:01 |
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   1 - filter("RN"<50000)
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What are you doing with the results of the select to archive the table in two pieces? If the archive is in the DB in two seperate tables, multi table insert would be an option:
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Table created.
SQL> create table archive_2 (data number);
Table created.
SQL> explain plan for insert when mod(rn, 2) = 0 then into archive_2 (data) values (data)
2 else into archive_1 (data) values(data)
3 select rownum as rn, data
4 from t;
Explained.
SQL> select * from table(DBMS_XPLAN.DISPLAY);
PLAN_TABLE_OUTPUT
Plan hash value: 828723766
| Id | Operation             | Name      | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | INSERT STATEMENT      |           | 99651 | 2530K|    31   (7)| 00:00:01 |
|   1 | MULTI-TABLE INSERT   |           |       |       |            |          |
|   2 |   INTO                | ARCHIVE_2 |       |       |            |          |
|   3 |   INTO                | ARCHIVE_1 |       |       |            |          |
|   4 |    VIEW               |           | 99651 | 2530K|    31   (7)| 00:00:01 |
|   5 |     COUNT             |           |       |       |            |          |
|   6 |      TABLE ACCESS FULL| T         | 99651 | 1265K|    31   (7)| 00:00:01 |
SQL> insert when mod(rn, 2) = 0 then into archive_2 (data) values (data)
2 else into archive_1 (data) values(data)
3 select rownum as rn, data
4 from t;
100000 rows created.Another option would be to use the last digit of rowid to split the table into two groups, but they will not be equal sized.
SQL> explain plan for select *
2 from t
3 where substr(rowid, length(rowid), 1) = upper(substr(rowid, length(rowid), 1))
4 or substr(rowid, length(rowid), 1) in ('0', '1', '2', '3', '4');
Explained.
SQL> select * from table(DBMS_XPLAN.DISPLAY);
PLAN_TABLE_OUTPUT
Plan hash value: 2153619298
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      | 59025 | 1441K|    98 (71)| 00:00:02 |
|* 1 | TABLE ACCESS FULL| T    | 59025 | 1441K|    98 (71)| 00:00:02 |
Predicate Information (identified by operation id):
   1 - filter(SUBSTR(ROWIDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)='0
              ' OR SUBSTR(ROWIDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)='1' OR
              SUBSTR(ROWIDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)='2' OR
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              IDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)))
Note
   - dynamic sampling used for this statement
23 rows selected.
SQL> explain plan for select *
2 from t
3 where substr(rowid, length(rowid), 1) <> upper(substr(rowid, length(rowid), 1))
4 and substr(rowid, length(rowid), 1) not in ('0', '1', '2', '3', '4');
Explained.
SQL> select * from table(DBMS_XPLAN.DISPLAY);
PLAN_TABLE_OUTPUT
Plan hash value: 2153619298
| Id | Operation         | Name | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |      | 40627 |   991K|    41 (30)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| T    | 40627 |   991K|    41 (30)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - filter(SUBSTR(ROWIDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)<>'
              0' AND SUBSTR(ROWIDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)<>'1' AND
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              SUBSTR(ROWIDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)<>'3' AND
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              WIDTOCHAR(ROWID),LENGTH(ROWIDTOCHAR(ROWID)),1)))
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   - dynamic sampling used for this statement
23 rows selected.
SQL> select count(*)
2 from t
3 where substr(rowid, length(rowid), 1) = upper(substr(rowid, length(rowid), 1))
4 or substr(rowid, length(rowid), 1) in ('0', '1', '2', '3', '4');
COUNT(*)
     59242
SQL> select count(*)
2 from t
3 where substr(rowid, length(rowid), 1) <> upper(substr(rowid, length(rowid), 1))
4 and substr(rowid, length(rowid), 1) not in ('0', '1', '2', '3', '4');
COUNT(*)
     40758
EDIT:
I realized that I screwed up above. In hind sight I don't know what I was thinking. I was attempting to use X = upper(X) to find the upper case characters A-Z. So the two queries to split rows based on the last character of rowid are not right. I don't have time to fix now, but wanted to leave a note of warning.
Edited by: Shannon Severance on Jul 29, 2011 1:34 AM

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Solved!
Go to Solution.

MiMeQu wrote:
I was wondering if anyone else has had an issue with their DVR splitting a show into two segments?
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Has this happened with anyone else, and if so, is there anything that can be done to fix this? The only answer I have gotten from Verizon is to unplug the DVR to reset it.
This doesn't happen all the time, but it happens enough that I find this annoying.
I would appreciate any input anyone can give. Thanks.
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Split 4k monitor into two "virtual monitors"?

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