Deallocate unused space

Hi Folks,
I would like to know the difference between these 2 ways of deallocating the unused space.
Can you please provide me the details?
way1:
alter table table_name deallocate unused;
way2:
alter table table_name enable row movement;
alter table table_name shrink space compact;
alter table table_name shrink space;
alter table table_name disable row movement;
Thanks

Shrinking table using alter table shrink space statement is a better than using alter table deallocate unused because shrink operation unused space above and below high water mark. but just space deallocation operation will effect unused space only above high water mark.

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Need advice about coalesce and deallocate unused space

Hi experts;
Here looking for an advice about coalesce and deallocate unused space.
I got this tablespace with 87% full, one of the table in that tablespace has 1,150,325 records. I'm going to delete 500,000 records from that table, but to release the space used by those records I understand that I need to execute other procedure. I was reading about coalesce tablespace and deallocate unused space.
I found that apparently, both process can help me to free space. If you want to share with me your comments, about advantages or disadvantages about them, in order I can take the best solution?
Thanks for your comments.
Al

Hi
after deleted rows, the high water mark is still the same and so the size of the table. you need to bring down the water mark
here is what you need to do to bring down the high water mark. We do this monthly for performance purpose.
This is an EBS R12 system but the procedures are the same for EBS database or non EBS database.
After you purge or delete data in a table
1) alter table APPLSYS.WF_ITEM_ATTRIBUTE_VALUES move; <-- this operation will invalidate all indexes attache to the table
2)select owner, index_name, status from dba_indexes -- list all invalid object for user APPLSYS
where table_owner = upper('APPLSYS')
and
status NOT IN ('VALID','N/A');
3)spool idxrebuild.sql --generate script to rebuild indexes.
select 'alter index ' ||owner||'.'||index_name ||' rebuild online;' from dba_indexes
where table_owner = upper('APPLSYS')
and
status <> 'VALID';
4) run idxrebuild.sql -- to rebuild indexes. -- at this point if you check spaces on the table, it is still the same, you need to run #5
5)exec fnd_stats.gather_schema_stats ('APPLSYS'); --fnd_stat is for EBS system you can replace with the database equivalent command.
use this statement to count the block before and after the operation to see the different.
select DISTINCT(SEGMENT_NAME), count(blocks) "Total Block" from dba_extents
where
owner IN ('APPLSYS')
AND segment_name = 'WF_ITEM_ATTRIBUTE_VALUES'
Hope this help.

What is the different DEALLOCATE UNUSED - datafile resize operation ?

hi everybody,
i have a question about DEALLOCATE UNUSED.
what is the different DEALLOCATE UNUSED command and datafile resize operation ?
Thanks.

Deallocate unused space clause is used to to explicitly deallocate unused space at "the end" of a segment and makes that space available for other segments within the tablespace. Internally, Oracle deallocates unused space beginning from the end of the objects (allocated space) and moving downwards toward the beginning of the object, continuing down until it reaches the high water mark (HWM).
Datafile resize add/substracts physical operating system bytes from the datafile .
Cheers :)
Renjith Madhavan

How deallocate unused in partition

dear all,
In order to save space in my database, my steps to drop a table is:
1.- truncate table TABLE_NAME reuse storage;
2.- alter table TABLE_NAME deallocate unused ;
3.- drop table TABLE_NAME ;
This is ok.
But my question is:
* How can i proceed if my table have partitions? *
I think that the syntax could be:
1.- alter table TABLE_NAME truncate partition PARTITION_93 reuse storage;
2.- ALTER TABLE TABLE_NAME deallocate unused ; This is my doubt
3.- ALTER TABLE TABLE_NAME DROP PARTITION PARTITION_93;
In step 2, how can i say that must to work in partition_93 ???
thanks to all.

The space allocated to the table,gets released once its dropped (or truncated.In truncate the tables structure stays).What is the need of 1st and 2nd step, when finally the table is dropped? correct me, might be i didn't understand your procedure for releasing/saving space.
Anand

Add button to unused space in JTableHeader

I have modified my JTable so that I can have multiple rows of column headers. I did this by extending BasicTableHeaderUI. In my particular instance, the first column of the table will never have more than one row in the header (unlike other implementations of multi-row headers I have seen, my column headers don't automatically fill upwards to take up all usable space in the header). So, I have "unused" space in the header above the first column.
I would like to put some buttons there that are relevant to the table, but so far every effort to do so has failed.
In the SSCCE below I have created a very stripped down version of my TableHeaderUI. It doesn't contain any of the code to create multiple row headers, it just pushes down the standard column headers to create some space. I try adding a button to the rendererPane, but it doesn't show up. There is a commented out line that paints the button which does work in terms of showing the button, but that's probably not the right way to do this (and the button doesn't work anyway).
So, why isn't the button showing up? Am I doing this the right way (i.e. adding the button within the UI)? Thanks in advance for you help.
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class HeaderButtonTable extends JPanel {
     public HeaderButtonTable() {
          String[] colNames = {"column 1", "column2", "column3"};
          Object[][] data = {{"a","b","c"},{"d","e","f"}};
          JTable table = new JTable(data, colNames);
          table.setPreferredScrollableViewportSize(new Dimension(400,100));
          table.setFillsViewportHeight(true);
          table.getTableHeader().setUI(new ButtonHeaderUI());
          JScrollPane scrollPane = new JScrollPane(table);
          add(scrollPane);
     public class ButtonHeaderUI extends BasicTableHeaderUI {
          public void paint(Graphics g, JComponent c) {
               Rectangle clip = g.getClipBounds();
               Point left = clip.getLocation();
               Point right = new Point( clip.x + clip.width - 1, clip.y );
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               int cMin = header.columnAtPoint(left);
               int cMax = header.columnAtPoint(right);
               if (cMin == -1) cMin = 0;
               if (cMax == -1) cMax = cm.getColumnCount()-1;
               TableColumn draggedColumn = header.getDraggedColumn();
               int columnWidth;
               Rectangle cellRect = header.getHeaderRect(cMin);
               TableColumn aColumn;
               for(int column = cMin; column <= cMax ; column++) {
                    aColumn = cm.getColumn(column);
                    columnWidth = aColumn.getWidth();
                    cellRect.width = columnWidth;
                    if (aColumn != draggedColumn) {
                         paintCell(g, cellRect, column);
                    cellRect.x += columnWidth;
              JButton test = new JButton("test");
              test.addActionListener(new ActionListener(){
                    public void actionPerformed(ActionEvent e) {
                         System.out.println("pressed");
              test.setBounds(2, 2, 60, 15);
              rendererPane.add(test); //why isn't this showing up?
              //this line will display the button, but button doesn't work
//          rendererPane.paintComponent(g, test, header, 2, 2, 60, 15);
          private Component getHeaderRenderer(int columnIndex) {
               TableColumn aColumn = header.getColumnModel().getColumn(columnIndex);
               TableCellRenderer renderer = aColumn.getHeaderRenderer();
               if (renderer == null) renderer = header.getDefaultRenderer();
               return renderer.getTableCellRendererComponent(header.getTable(),
                    aColumn.getHeaderValue(), false, false, -1, columnIndex);
          private void paintCell(Graphics g, Rectangle cellRect, int columnIndex) {
               Component component = getHeaderRenderer(columnIndex);
               rendererPane.paintComponent(g, component, header,
                    cellRect.x, cellRect.y + 30, cellRect.width,
                    cellRect.height - 30, true);
          public Dimension getPreferredSize(JComponent c) {
               long width = 0;
               Enumeration enumeration = header.getColumnModel().getColumns();
               while (enumeration.hasMoreElements()) {
                    TableColumn aColumn = (TableColumn)enumeration.nextElement();
                    width = width + aColumn.getPreferredWidth();
               return new Dimension((int)width, 60);
     public static void main(String[] args) {
          JFrame frame = new JFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.add(new HeaderButtonTable());
          frame.pack();
          frame.setVisible(true);
}

Yes, I've seen similar links/posts about how to activate buttons in the header of a table, but those do it by adding listeners to the renderer. My buttons would be directly in the CellRendererPane that is the container for the table header. I would have thought that by putting the button directly in the Cell RendererPane that it would have nothing to do with the rest of the table header. CellRendererPane extends Container. Is it not possible to put a JButton in a Container? JFrame extends indirectly from Container and you can add buttons to that.
Edited by: Bob.B on Oct 28, 2009 10:57 PM

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Hello all,
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alter table "ODB"."BLOB_TABLE" shrink space; This couldn't execute with ora 10662 error. Could you please help

'Shrink space' has requirements:
shrink_clause
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Sybrand Bakker
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I erased my windows partition using disk utility then realized I should have used boot camp, because now I can't resize the original partition and seem to be stuck with a ghost unusable space. Boot Camp now doesn't give me the option to install or re

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Hi, Ralph,
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Where did 30GB of unused space on my SSD main drive go? I have a mid 2011 iMac that until yesterday had just 54GB of space occupied on the primary drive. I imported 45 minutes of video from an SD card. Could that have used up the space?

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Hello,
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Last edited by PaulBx1 (2011-09-27 16:13:49)

How to discard unused space on an SSD?

Dear forum,
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Spinrite?
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thanks

Deallocate unused space

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