Hi Rick,
I think it would be a great enhancement...
I think all of the choices you have specified are good to have, but at the very
least one should be able to do #1 (limit on the total space consumed by a
database).
Thanks,
Oskar
From: Rick Hillegas
On 2/28/13 2:34 PM, Oskar Zinger wrote:
Is there a way to limit the size of the Derby database and how large it can
grown on disk?
Thanks,
Oskar
Sent from my iPhone
Hi Oskar,
I'm not aware of any useful way to do this. You can always use operating
system controls to limit the size
Is there a way to limit the size of the Derby database and how large it can
grown on disk?
Thanks,
Oskar
Sent from my iPhone
no other way? How to limit the size of db file after
large amounts of insert and delete operation?
thanks.
Best Regards
L.Y.C
How to limit thesize of db file afterlarge amounts of insert and delete
operation?
One common technique for handling this pattern of activity, is to use
a collection of tables, rather than a single table, and to drop entire
tables rather than deleting rows from an existing table.
For example
and experiencing the increasing size of
db files. The .dat files in the seg0 directory eating up my disk space!
I searched a lot about how to avoid the db file becoming huge but only one
solution described in manual: Reclaiming unused space.
Is there really no other way? How to limit the size of db
columns?
Regards,
--
Kristian
Patrick
-Original Message-
From: Rick Hillegas [mailto:rick.hille...@oracle.com]
Sent: Thursday, May 24, 2012 12:08 PM
To: derby-user@db.apache.org
Subject: Re: limit on the number of columns
On 5/24/12 4:26 AM, Patrick Meyer wrote:
I am aware that Derby has
It's hard to say. For my application, the end-user creates the tables. Most
users are fine with the 1,012 limit but some power users will have
extremely large datasets. I imagine that a few thousand would be fine.
In looking through documentation of other database systems it looks like
MySQL
I am aware that Derby has a limit of 1,012 columns for each table, but many
users of my application (it is a program for statistical analysis) have very
large files that go well beyond this number of columns. Does anyone know of
a strategy for using multiple tables to present one large virtual
On 5/24/12 4:26 AM, Patrick Meyer wrote:
I am aware that Derby has a limit of 1,012 columns for each table, but
many users of my application (it is a program for statistical
analysis) have very large files that go well beyond this number of
columns. Does anyone know of a strategy for using
That would be excellent! I think it would be a great feature to have in
Derby.
Patrick
-Original Message-
From: Rick Hillegas [mailto:rick.hille...@oracle.com]
Sent: Thursday, May 24, 2012 12:08 PM
To: derby-user@db.apache.org
Subject: Re: limit on the number of columns
On 5/24/12 4:26
On Wed, Apr 21, 2010 at 4:00 PM, Knut Anders Hatlen knut.hat...@sun.com wrote:
On 04/21/10 10:17 AM, George H wrote:
Thanks for the extra info. I guess I am still stuck. I have then
another question, how does one insert large BLOBs (ie., 1MB size) into
derby just from the IJ console? I know
wondering if there is a way to
extend the size limit or to get derby to accept it into a blob. Or is
there really nothing I can do about it
Hi George,
You can insert hex strings into a BLOB column if you wrap it in a cast:
ij create table t (b blob);
0 rows inserted/updated/deleted
ij insert
for example and it allows me to send
hex strings to a blob column. I'm wondering if there is a way to
extend the size limit or to get derby to accept it into a blob. Or is
there really nothing I can do about it
Hi George,
You can insert hex strings into a BLOB column if you wrap
On 04/21/10 10:17 AM, George H wrote:
Thanks for the extra info. I guess I am still stuck. I have then
another question, how does one insert large BLOBs (ie., 1MB size) into
derby just from the IJ console? I know we shouldn't compare derby
to mysql but with mysql I can insert bytes into a
is limited to a size of 32,672 bytes. Derby
also does not let me insert hex strings into CLOB or BLOB columns
either which can be much larger.
I've tried doing this with MySQL for example and it allows me to send
hex strings to a blob column. I'm wondering if there is a way to
extend the size limit
[EMAIL PROTECTED] writes:
From http://db.apache.org/derby/docs/10.4/ref/rrefnumericlimits.htm
The largest INTEGER is 2,147,483,647.
ijdescribe t1;
COLUMN_NAME |TYPE_NAME|DEC|NUM|COLUM|COLUMN_DEF|CHAR_OCTE|IS_NULL
--
is that if you know or suspect that you're going to hit a limit,
you may want to take a step back, be less fancy and use an UPDATE CURSOR
(Updateable cursor) and loop through the data and update the row based on
the value being calculated.
So instead of writing a query and then executing it, you write
? ;-)
The point is that if you know or suspect that you're going to hit a limit,
you may want to take a step back, be less fancy and use an UPDATE CURSOR
(Updateable cursor) and loop through the data and update the row based on
the value being calculated.
So instead of writing a query and then executing
unludo wrote:
OK thanks a lot for your answers.
Regarding the 'ORDER BY RANDOM()', you also plan to have something similar?
ORDER BY RANDOM() already works for me. Example:
ij select i from t where i 5;
I
---
1
2
3
4
4 rows selected
ij select i from t where i 5 order by random();
unludo [EMAIL PROTECTED] writes:
Hello,
I would like to use the following constraints at the end of some queries:
SELECT a FROM B WHERE c = 'toto' ORDER BY RANDOM() LIMIT 10;
LIMIT is a non-standard extension. Derby 10.4 (soon to be released)
includes the SQL ROW_NUMBER function which
I believe there is an enhancement request to add LIMIT to Derby.
While it is not part of the SQL standard, most database vendor support
LIMIT or something similar and it is easier to use than ROW_NUMBER.
It would be a nice feature to consider.
JDBC 4.1 we will provide a JDBC escape
OK thanks a lot for your answers.
Regarding the 'ORDER BY RANDOM()', you also plan to have something similar?
regards
Ludovic
Lance Andersen-2 wrote:
I believe there is an enhancement request to add LIMIT to Derby.
While it is not part of the SQL standard, most database vendor support
Hello,
I would like to use the following constraints at the end of some queries:
SELECT a FROM B WHERE c = 'toto' ORDER BY RANDOM() LIMIT 10;
It is supposed to return 10 values randomly from the B table.
In fact I use that with postgresql.
Also if someone knows if ejbql supports a random
Hi Sudhakar,
Please note, as explained in DERBY-2998 and DERBY-581, that we are *not*
implementing LIMIT (a dialect word), but rather following the SQL
standard using the ROW_NUMBER() rank function.
There is still a way to go, and as Brian says if you're interested in
helping we'd
Everything I've read so far says that Derby does not implement LIMIT
which lets you write queries that return only so many rows in the resultset.
Is this still the case or has this changed? Or are there initiatives to
implement this? This seems to be a serious limitation when working with
large
Everything I've read so far says that Derby does not implement LIMIT
which lets you write queries that return only so many rows in the resultset.
Is this still the case or has this changed? Or are there initiatives to
implement this?
DERBY-581 and DERBY-2998 are relevant, I believe.
If you
We need to implement the pagination solution using the Derby DB.
For example if a make a query select * from table a. I want to retrieve
records from 1 to 100, 101 to 200, 201 to 300 etc.. using some thing like
LIMIT with offset etc..
I am looking for any derby database features to support
of resources and application is much faster.
but i am sure there is some body else's application that will be much
faster under DB2 or oracle.
Nurullah Akkaya
On Feb 20, 2007, at 2:54 PM, Tim Troup wrote:
Hi,
Is there a limit
body
else's application that will be much faster under DB2 or oracle.
Nurullah Akkaya
On Feb 20, 2007, at 2:54 PM, Tim Troup wrote:
Hi,
Is there a limit on the number of rows a table can hold?
I am planning on using derby as the RDBMS for a system
Hi,
Is there a limit on the number of rows a table can hold?
I am planning on using derby as the RDBMS for a system that will
require tables to hold billions of rows.
Thanks, Tim
Billions of rows?
Sounds like you'll need to rethink your design.
Sure you can do it, but how efficient will it be?
-Original Message-
From: Tim Troup [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 20, 2007 6:55 AM
To: Derby Discussion
Subject: Limit on number of rows a table
will it be?
-Original Message-
From: Tim Troup [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 20, 2007 6:55 AM
To: Derby Discussion
Subject: Limit on number of rows a table can hold?
Hi,
Is there a limit on the number of rows a table can hold?
I am planning on using derby as the RDBMS for a system
, but will it perform as well as other databases?
-Original Message-
From: A. Rick Anderson [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 20, 2007 7:45 AM
To: Derby Discussion
Subject: Re: Limit on number of rows a table can hold?
But we'd all like to know at what point it rolls over and dies
saved a lot of resources and application
is much faster. but i am sure there is some body else's application
that will be much faster under DB2 or oracle.
Nurullah Akkaya
On Feb 20, 2007, at 2:54 PM, Tim Troup wrote:
Hi,
Is there a limit on the number of rows a table can hold?
I am
Hi,
Is there a jira issue for adding a limit statement (to limit
the number of records returned) to a select statement? I did a jira search but
could find no such issue. Id like to vote for it.
I also searched the mailing list for discussions regarding
this feature, and responses
Is there a jira issue for adding a limit statement (to limit the number
of records returned) to a select statement? I did a jira search but
could find no such issue. I’d like to vote for it.
Hi Jim,
I think DERBY-581 is the issue that tracks this request:
http://issues.apache.org/jira
Marl Atkins wrote:
This would only work if the ID field is an Identity.
As it happens, it IS so this should work for me too.
THREE answers to my problem.
You guys are good THANKS!!
Yes, but is there an equivalent to the TOP or LIMIT keywords that other
databases use?
Tim
Tim Dudgeon wrote:
Marl Atkins wrote:
This would only work if the ID field is an Identity.
As it happens, it IS so this should work for me too.
THREE answers to my problem.
You guys are good THANKS!!
Yes, but is there an equivalent to the TOP or LIMIT keywords that other
Bernt M. Johnsen wrote:
Tim Dudgeon wrote:
Yes, but is there an equivalent to the TOP or LIMIT keywords that other
databases use?
Not in SQL (neither in Derby nor the SQL standard).
The closest equivalent is Statement.setMaxRows(i).
So that would not be applied at the query level
It would be great if Derby had TOP (as in SQL Server) and LIMIT (as in
MySql), because DataSet does not allow setMaxRows. TOP and LIMIT should
support variables:
@Select(SELECT TOP ?1 * FROM Users WHERE Pin IS NULL)
DataSetUsers getWithoutPin(int top);
-- Harri
Tim Dudgeon wrote:
Bernt M
Tim Dudgeon wrote:
Bernt M. Johnsen wrote:
Tim Dudgeon wrote:
Yes, but is there an equivalent to the TOP or LIMIT keywords that other
databases use?
Not in SQL (neither in Derby nor the SQL standard).
The closest equivalent is Statement.setMaxRows(i).
So that would
Hi:
I'm searching the docs and can't find it.
Is there a way to limit the number of records in the result like:
Sql Server: Select Top 1 * From MyRecs ORDER BY ID DESC
MySql: Select * From MyRecs ORDER BY ID DESC LIMIT 1
Basically, I need the ID of the last record inserted.
How can I get
to limit the number of records in the result like:
Sql Server: Select Top 1 * From MyRecs ORDER BY ID DESC
MySql: Select * From MyRecs ORDER BY ID DESC LIMIT 1
Basically, I need the ID of the last record inserted.
How can I get that?
e.g. by calling stmt.setMaxRows(1);
but it will not give
Yes, highest ID = it's an Identity field.
It looks to me like either would work.
Any idea which has a better performance?
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 14, 2006 8:04 PM
To: Derby Discussion
Subject: Re: Top 1 - Limit 1
Subject: Re: Top 1 - Limit 1
I think the IDENTITY_VAL_LOCAL() function is what Marl is actually looking
for. http://db.apache.org/derby/docs/10.1/ref/rrefidentityvallocal.html
Dan
On 14/09/06, Bernt M. Johnsen [EMAIL PROTECTED] wrote:
Marl Atkins wrote:
Hi:
I'm searching the docs
it.
You guys are good THANKS!!-Original Message-From: Dan Scott [mailto:
[EMAIL PROTECTED]]Sent: Thursday, September 14, 2006 7:28 PMTo: Derby DiscussionSubject: Re: Top 1 - Limit 1I think the IDENTITY_VAL_LOCAL() function is what Marl is actually looking
for. http://db.apache.org/derby/docs
Can anyone tell me what this means?
ERROR 22001: A truncation error was encountered trying to shrink CLOB '#
#Tue Dec 06 10:35:22 GMT 2005
f1=bTest 1 succeeeded (2 m' to length 1048576.
Is there some sort of upper limit on the size of a CLOB
Danesh's fetch first 5 didn't work -- thanks anyway though.
But Amit's java.sql.Statement.setMaxRows() works perfectly. Nice!
Title: Message
Hello. I'm
trying to limit the number of rows returned by a select statement. I know
that other databases have way to do this, such as:
select * top 10 from
thetable
set rowcount
5
select * from
thetable
select * from
thetable limit 10
But I gather
Daniel Tripp wrote:
Hello. I'm trying to limit the number of rows returned by a select
statement. I know that other databases have way to do this, such as:
select * top 10 from thetable
set rowcount 5
select * from thetable
select * from thetable limit 10
But I gather
Does Derby optimize queries that use ORDER BY and setMaxRows() when
indexes are present?
My situation: I have an existing Derby table listing 2 million cities,
with the name, latitude, longitude, and population of each city. I want to
efficiently find the 50 most populous cities between (for
the merge buckets - that is about the opposite
of what you want for a limited result. You rather have buckets for
ranges and then once you had 50 more than a given value you could throw
away all those bigger/less than the value.
The limit function as you say I believe mostly just cuts off
merge buckets
and finally merge all the merge buckets - that is about the opposite
of what you want for a limited result. You rather have buckets for
ranges and then once you had 50 more than a given value you could throw
away all those bigger/less than the value.
The limit function as you say I
As far as I know, Derby doesn't optimize based on maxRows. This is only
used to limit rows returned to clients, as you mentioned below.
Satheesh
Mike Matrigali wrote:
I'll start by saying that I am not an optimizer expert. I don't think
the optimizer does anything special with limits - but I
Hi,
I have the following odd requirement...
I require opening a single connection to multiple databases concurrently.
The Derby embedded driver seems to fall out while attempting to open 75 - 85
different databases.
Is there any record of this limitation? What are my options?
Any help will be
I don't think there is any restriction as such. Try running your VM with
extra heap size and it should be fine. I was able to create 100
databases and connect to each of them.
The default heap memory allocated by the VM may be insufficient for such
a high number of active databases.
Hope this
Neal Dewing wrote:
Hi,
I have the following odd requirement...
I require opening a single connection to multiple databases concurrently.
The Derby embedded driver seems to fall out while attempting to open 75 - 85
different databases.
Is there any record of this limitation? What are my
Hi
Is it possible to use LIMIT keyword with select statement?
Or is there any other alternative for the same?
Thanx
Devang
On Wed, 16 Mar 2005 19:52:56 +0530, Devang
[EMAIL PROTECTED] wrote:
Hi
Is it possible to use LIMIT keyword with select statement?
Or is there any other alternative for the same?
Thanx
Devang
Hi Devang,
If you search for Support for SQL Limit
Derby allows limiting the number of rows returned by a query using
JDBC. You can use java.sql.Statement.setMaxRows() method.
Satheesh
Devang wrote:
Hi
Is it possible to use LIMIT keyword with
select statement?
Or is there any other
alternative for the same
On Wed, 16 Mar 2005 06:48:16 -0800, Mamta Satoor [EMAIL PROTECTED] wrote:
On Wed, 16 Mar 2005 19:52:56 +0530, Devang
[EMAIL PROTECTED] wrote:
Hi
Is it possible to use LIMIT keyword with select statement?
Or is there any other alternative for the same?
Thanx
, 2005 9:19 AM
To: Derby Discussion
Cc: Derby Development
Subject: Re: LIMIT with Select Statement
On Wed, 16 Mar 2005 06:48:16 -0800, Mamta Satoor
[EMAIL PROTECTED] wrote:
On Wed, 16 Mar 2005 19:52:56 +0530, Devang
[EMAIL PROTECTED] wrote:
Hi
Is it possible
16, 2005 9:31 AM
To: Derby Discussion
Subject: Re: LIMIT with Select Statement
Bernd:
That's not a good assumption. The Derby Project Charter
(http://incubator.apache.org/derby/) states:
The Derby project develops open source database technology that is:
* Pure Java
* Easy
On a personal note...
Bernd Ruehlicke wrote:
I assume Derby has to stay in a mode so it is always possible to
migrate to DB2 ? - Not that I know of this - I am just throwing the ball
in the air to see if anyone is responding to this.
Compliance with the SQL standard and building the best damn
Mamta Satoor wrote:
On Wed, 16 Mar 2005 19:52:56 +0530, Devang [EMAIL PROTECTED] wrote:
...
Is it possible to use LIMIT keyword with select statement?
Or is there any other alternative for the same?
...
If you search for Support for SQL Limit? in the derby developer list
archive, you will find
Thanks for the replies. Then Derby is good enough regarding the database
size.
Hong
-Original Message-
From: Mike Matrigali [mailto:[EMAIL PROTECTED]
Sent: Tuesday, January 11, 2005 11:37 AM
To: Derby Discussion
Subject: Re: Database Size Limit
Note that derby uses 64 bit file
in a VLDB (ie. parallel thread
execution of a single query, parallel sort, offline indexing,
incremental backup, ...).
Jack Klebanoff wrote:
Hong Ji wrote:
Hi,
Does Derby have any limit on the database size?
Thanks.
Hong
A Derby database is stored in multiple files under one directory, so
LIMIT functionality. Or for those of you not
familiar with mySQL syntax specifically, the ability to fetch x records from
a point y number of records into the recordset.
In mySQL I would be able to tack 'LIMIT y,x' onto the end of a query to
accomplish this, but I can't find any kind
have the need to use LIMIT functionality. Or for those of you not
familiar with mySQL syntax specifically, the ability to fetch x records from
a point y number of records into the recordset.
In mySQL I would be able to tack 'LIMIT y,x' onto the end of a query to
accomplish this, but I can't
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