java.lang.NoClassDefFoundError: com/jcraft/jsch/JSchException        at org.apache.ivy.plugins.resolver.SFTPResolver.<init>(SFTPResolver.java:31)        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)        at java.lang.reflect.Constructor.newInstance(Constructor.java:274)        at java.lang.Class.newInstance0(Class.java:308)        at java.lang.Class.newInstance(Class.java:261)        at org.apache.ivy.util.Configurator.addChild(Configurator.java:574)        at org.apache.ivy.util.Configurator.startCreateChild(Configurator.java:503)        at org.apache.ivy.core.settings.XmlSettingsParser.inConfiguratorStarted(XmlSettingsParser.java:569)        at org.apache.ivy.core.settings.XmlSettingsParser.startElement(XmlSettingsParser.java:201)        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)        at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)        at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)        at javax.xml.parsers.SAXParser.parse(SAXParser.java:223)        at org.apache.ivy.core.settings.XmlSettingsParser.doParse(XmlSettingsParser.java:160)        at org.apache.ivy.core.settings.XmlSettingsParser.parse(XmlSettingsParser.java:150)        at org.apache.ivy.core.settings.IvySettings.load(IvySettings.java:384)        at org.apache.ivy.Ivy.configure(Ivy.java:411)        at org.apache.ivy.ant.IvyAntSettings.createIvyEngine(IvyAntSettings.java:272)        at org.apache.ivy.ant.IvyAntSettings.getConfiguredIvyInstance(IvyAntSettings.java:237)        at org.apache.ivy.ant.IvyTask.getIvyInstance(IvyTask.java:92)        at org.apache.ivy.ant.IvyTask.prepareTask(IvyTask.java:256)        at org.apache.ivy.ant.IvyTask.execute(IvyTask.java:276)        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)        at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)        at java.lang.reflect.Method.invoke(Method.java:324)        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)        at org.apache.tools.ant.Task.perform(Task.java:348)        at org.apache.tools.ant.Target.execute(Target.java:357)        at org.apache.tools.ant.Target.performTasks(Target.java:385)        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)        at org.apache.tools.ant.Project.executeTarget(Project.java:1306)        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)        at org.apache.tools.ant.Project.executeTargets(Project.java:1189)        at org.apache.tools.ant.Main.runBuild(Main.java:758)        at org.apache.tools.ant.Main.startAnt(Main.java:217)        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

Resolve: download http://sourceforge.net/projects/jsch/files/jsch/jsch-0.1.42.jar/download and place it in $ANT_HOME/lib

JSCH: JSch allows you to connect to an sshd server and use port forwarding, X11 forwarding, file transfer, etc., and you can integrate its functionality into your own Java programs. JSch is licensed under BSD style license.

These types of problems typically are known as caching problems. Save your results so you don’t have to do it again!

It’s not always so dramatic, but how many times do you want to recalculate things? The classic example of the Fibonacci sequence is an example:

f( n ) = f( n – 1 ) + f( n – 2 )

It’s trivial to translate this recursively. So we do. Unforunately, if you want to know, say, the 100-th Fibonacci number, and your computer does, say, a trillion calculations a second, it will still take, about 11 years to get your answer. So save and reuse your results! If you did do that, even if you only do 100 operation a second, it’ll take less than a minute!

Yes, someone’s going to point out you only need the last two numbers, so you can use a for loop. You’re perfectly correct, and that’s “Dynamic Programming” (DP). Sometimes memoization is faster, sometimes dp is faster. Experience will tell you which one is which.

I’m handwaving right now, but this isn’t simply “saving down results”, of course. DP/Memo is when you know that certain results will be re-used in the future, exploiting the fact that well, you don’t need to redoing the same thing over and over again..

psql -f createDB.sql

I want the script to call other scripts (separate ones for creating tables, adding constraints, functions etc), like this:

\i script1.sql
\i script2.sql

It works fine provided that createDB.sql is in the same dir

But if I move script2 to a directory under the one with createDB, and modify the createDB so it looks like this:

\i script1.sql
\i somedir\script2.sql

I got an error:

psql:createDB.sql:2: somedir: Permission denied

I’m using Postgres Plus 8.3 for windows, default postgres user.

EDIT: silly me, unix slashes solve the problem

OR Primary: 202.56.215.54 Secondary: 202.56.215.55

SELECT file_name, tablespace_name FROM dba_data_files WHERE tablespace_name = ‘PROD_TBLSPACE’ ;

DROP TABLESPACE  PROD_TBLSPACE INCLUDING CONTENTS AND DATAFILES;

//

// // <![CDATA[
ch_client = “mydigitallife”;
ch_type = “mpu”;
ch_width = 468;
ch_height = 90;
ch_non_contextual = 4;
ch_noborders = 1;
ch_vertical =”premium”;
ch_sid = “MDL_Premium_Banner”;
var ch_queries = new Array( );
var ch_selected=Math.floor((Math.random()*ch_queries.length));
if ( ch_selected

Oracle RDBMS databases stores data logically in the form of tablespaces and physically in the form of data files. The datafiles are added to the tablespaces as database space requirement grows bigger. However, there are several reasons you may want to remove or delete data files from a tablespace. Such as accidentally add a wrongly sized or unwanted datafile to a tablespace, or the data space usage has became smaller and some data files want to be removed, or attempt to recover Oracle database which fails to start due to missing or corrupted datafiles by removing them, Oracle does not provide an easy way or user interface to delete or drop datafiles from a tablespace. Once a datafile is made part of a tablespace, it can no longer be detached or removed from the tablespace, albeit there are several workarounds.

How to Completely Drop the Whole Tablespace with All Datafiles

The easiest way to drop a or multiple datafiles is by dropping the entire tablespace together with its datafiles. If you no longer need the data contents of the tablespace, the following command will drop the tablespace, the datafile, and the tablespace’s contents from the data dictionary. All of the objects that where contained in that tablespace are permanently removed.

DROP TABLESPACE  ‘PROD_TABLESPACE’ INCLUDING CONTENTS AND DATAFILES;

If you don’t specify “AND DATAFILES”, Oracle will not drop the physical datafile after the DROP TABLESPACE command, but you can always delete the files from operating system shell (If the data files are locked, restart the server).

But always perform a backup of the database, as the “DROP TABLESPACE” command is irreversible. It’s also a good practice to check and identify how many datafiles a tablespace actually has before performing the drop action in order to avoid mistake.

How to Check How Many Datafiles a Tablespace Has

To determine and identify all datafiles that link to a tablespace, use the following query, with tablespace name in capital letter:

SELECT file_name, tablespace_name FROM dba_data_files WHERE tablespace_name = PROD_TABLESPACE ;

If a tablespace contains multiple datafiles, and you just want to drop one or some of the datafiles and keep the remaining datafiles together with the objects and contents, the objects or data must be exported for the affected table space. Once exported, the tablespace can be dropped with above “DROP TABLESPACE” command. Then, recreate the tablespace with the datafile(s) required (that you initially want to keep), and then import the objects into the recreated tablespace.

If one or more datafiles is missing after a recovery process or accidental deletion, you can use ALTER DATABASE DATAFILE <datafile name> OFFLINE DROP command to make the datafile offline so that database can starts up after which the troubled tablespace can be dropped. (See instruction to recover from missing datafiles.)

How to Resize a Datafile to Minimum Size

Another alternative to drop the datafile is by shrinking the size of datafile instead of dropping. This option is only possible if there is no extents in the datafile. If there are none, it’s possible to resize the data file down to a very small file (2 blocks), where Oracle database will no longer create any extent in the datafile. However, this workaround does not remove the datafile from tablespace nor delete the file physically, but it reduce the risk as no data will be truncated as only empty blocks are reduced. It simply makes it unusable and takes up almost close to no disk space. To resize a datafile, use the following query:

alter database datafile ‘<datafile name>’ resize 8M;

How to Determine the Extents inside Datafile

To check and determine the extents that exists in a datafile, use this query:

SELECT owner, segment_name
FROM dba_extents a, dba_data_files b
WHERE a.file_id = b.file_id
AND b.file_name = ‘<datafile name>’

SELECT file_name, tablespace_name FROM dba_data_files WHERE tablespace_name =’GPDDBSRV’;