Hi,
I was wondering what options I can tune to make sqlite use more memory. We are
currently using the memsys5 allocator and giving it a 2G buffer, but it doesn't
seem to be using any more than 32MB.
Thanks,
Dave M
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On Tue, Jul 16, 2013 at 8:13 PM, Eduardo emorr...@yahoo.es wrote:
Can you show us the query and/or schemas? If not:
Sure, I appended everything in the bottom of this email.
Unfortunately gmail will mess-up the layout, I hope it will be
readable.
(See here, it seems google does not know the mean
On Wed, 17 Jul 2013 12:04:52 +0200
Paolo Bolzoni paolo.bolzoni.br...@gmail.com wrote:
On Tue, Jul 16, 2013 at 8:13 PM, Eduardo emorr...@yahoo.es wrote:
Can you show us the query and/or schemas? If not:
Sure, I appended everything in the bottom of this email.
Unfortunately gmail will
Some changes, if blob is bigger than a few bytes, you should normalize them.
If 2 blobs are equal, their id must be equal and you don't waste time
comparing nor memory joining blob content. So you get:
They are quite small (max ~70 bytes...)
DROP TABLE IF EXISTS tour_blob;
CREATE TABLE
The test ended sometime during the night and setting temp_store to 0
the result is exactly the same. I suspect it was the default anyway.
On Mon, Jul 15, 2013 at 9:20 PM, Paolo Bolzoni
paolo.bolzoni.br...@gmail.com wrote:
On Mon, Jul 15, 2013 at 9:08 PM, Eduardo Morras emorr...@yahoo.es wrote:
On 07/16/2013 01:49 AM, Paolo Bolzoni wrote:
From 35-40MB to 940MB; I would put massif result but I think the
list deletes attachments.
A very large blob or string result? Code allocates (or leaks)
tremendous numbers of sqlite3_stmt* handles?
SQLite has various APIs for querying memory
On Tue, Jul 16, 2013 at 1:00 PM, Dan Kennedy danielk1...@gmail.com wrote:
On 07/16/2013 01:49 AM, Paolo Bolzoni wrote:
A very large blob or string result?
I would exclude this, I do use blobs... but they are at most
few dozen of bytes...
Code allocates (or leaks)
tremendous numbers of
I tried the experiment again with -g3 -O0, I got less
information than expected (there are still many unknown
symbols in libsqlite3.so), but the function requiring all
this memory is sqlite3_step.
So maybe it is one complex query?
I would like to avoid excessive swapping on the
production server,
On 16 Jul 2013, at 5:17pm, Paolo Bolzoni paolo.bolzoni.br...@gmail.com wrote:
the function requiring all
this memory is sqlite3_step.
So maybe it is one complex query?
Possibly a query for which no good index exists, so SQLite decides to make up
its own temporary index.
If you consider
On Tue, 16 Jul 2013 18:17:41 +0200
Paolo Bolzoni paolo.bolzoni.br...@gmail.com wrote:
I tried the experiment again with -g3 -O0, I got less
information than expected (there are still many unknown
symbols in libsqlite3.so), but the function requiring all
this memory is sqlite3_step.
Can you
I wrote an C++ application that uses sqlite3 to save part
of the data when it become larger than a known threshold.
The idea is to use at most a known quantity of memory;
to check if it is working I executed a relevant test
using valgrind's massif.
It worked fairly well most of the time, but in
On Mon, Jul 15, 2013 at 8:39 PM, Paolo Bolzoni
paolo.bolzoni.br...@gmail.com wrote:
So, sorry if the question sounds very vague. But what can
cause high memory usage in sqlite? A large transaction
maybe?
What is high? In my apps sqlite tends to use 200-400kb or so, which i
don't consider
From 35-40MB to 940MB; I would put massif result but I think the
list deletes attachments.
On Mon, Jul 15, 2013 at 8:41 PM, Stephan Beal sgb...@googlemail.com wrote:
On Mon, Jul 15, 2013 at 8:39 PM, Paolo Bolzoni
paolo.bolzoni.br...@gmail.com wrote:
So, sorry if the question sounds very
On 15 Jul 2013, at 7:49pm, Paolo Bolzoni paolo.bolzoni.br...@gmail.com wrote:
From 35-40MB to 940MB; I would put massif result but I think the
list deletes attachments.
Do you have in-memory tables ?
Do you use sqlite3_exec() ?
Do you have SELECTs for which there is no good index, forcing
On Mon, Jul 15, 2013 at 08:49:52PM +0200, Paolo Bolzoni scratched on the wall:
From 35-40MB to 940MB; I would put massif result but I think the
list deletes attachments.
By default, the page-cache is 2000. Pages are typically 1KB, but
have some minor overhead in the cache. Assuming you
On Mon, Jul 15, 2013 at 8:59 PM, Simon Slavin slav...@bigfraud.org wrote:
On 15 Jul 2013, at 7:49pm, Paolo Bolzoni paolo.bolzoni.br...@gmail.com
wrote:
From 35-40MB to 940MB; I would put massif result but I think the
list deletes attachments.
Do you have in-memory tables ?
No.
Do you
On Mon, 15 Jul 2013 20:49:52 +0200
Paolo Bolzoni paolo.bolzoni.br...@gmail.com wrote:
From 35-40MB to 940MB; I would put massif result but I think the
list deletes attachments.
What does PRAGMA temp_store show? Set it to 0 and recheck. Did you compile with
SQLITE_TEMP_STORE set to 3?
---
On Mon, Jul 15, 2013 at 9:08 PM, Eduardo Morras emorr...@yahoo.es wrote:
On Mon, 15 Jul 2013 20:49:52 +0200
Paolo Bolzoni paolo.bolzoni.br...@gmail.com wrote:
From 35-40MB to 940MB; I would put massif result but I think the
list deletes attachments.
What does PRAGMA temp_store show? Set it
SQL's memory usage. I found a solution
for C++ but I use Java.
Any help would be greatly appreciated!
Mira
--
View this message in context:
http://sqlite.1065341.n5.nabble.com/Track-SQLite-memory-usage-from-inside-Java-code-tp62756.html
Sent from the SQLite mailing list archive at Nabble.com
Similar to Pavel's suggestion, our implementation maintains a simple
cache of prepared statements, keyed by the SQL query that created
them. For example:
pStatement = Cache.GetQuery(SELECT * FROM xyz);
would return the cached statement if the query had been seen before,
or would auto-create
Hi Eric,
On 24/4/2012 10:03 PM, Eric Minbiole wrote:
Similar to Pavel's suggestion, our implementation maintains a simple
cache of prepared statements, keyed by the SQL query that created
them. For example:
pStatement = Cache.GetQuery(SELECT * FROM xyz);
would return the cached statement
Hi, our system does fairly predictable queries when it runs. A number
of modules all access data using a handful of queries of each. We open
the database at the start and close it at the end of the program.
Each query follows the usual pattern of prepare - bind - step - reset -
(eventually)
1. Do statements do any thing that would require a lot of memory to be
maintained?
No, they don't need a lot of memory, but still some memory is used. So
if you have like thousands of statements you should worry about this.
If you have 20 or 30 statements your database cache will likely
consume
Thanks Pavel,
That gives me something new to do with SQLite over the next few weeks.
On 23/4/2012 8:47 PM, Pavel Ivanov wrote:
1. Do statements do any thing that would require a lot of memory to be
maintained?
No, they don't need a lot of memory, but still some memory is used. So
if you have
On 9 Mar 2011, at 15:23, Nick Hodapp wrote:
I'm using sqlite in an iOS app, via the popular FMDB wrapper.
My profiling tool is showing me that the app is using 2.5 MB of memory
before a VACUUM, and nearly 6MB after. The tool shows that the extra memory
was allocated by sqlite3MemMalloc().
I'm using sqlite in an iOS app, via the popular FMDB wrapper.
My profiling tool is showing me that the app is using 2.5 MB of memory
before a VACUUM, and nearly 6MB after. The tool shows that the extra memory
was allocated by sqlite3MemMalloc(). If I close and re-open the database
then the
On 09.03.2011, at 16:23, Nick Hodapp wrote:
I'm using sqlite in an iOS app, via the popular FMDB wrapper.
My profiling tool is showing me that the app is using 2.5 MB of memory
before a VACUUM, and nearly 6MB after. The tool shows that the extra memory
was allocated by sqlite3MemMalloc().
Is there any sqlite function I can call, or some other technique, to reduce
the memory allocated and hung-onto by sqlite, particularly during a VACUUM?
Yes, execute pragma cache_size = 100 for example, or put other
number of your liking into there.
If closing and re-opening of the database
Hi,
We are trying to Integrate SQLite in our Application and are trying to populate
as a Cache. We are planning to use it as a In Memory Database. Using it for the
first time. Our Application is C++ based.
Our Application interacts with the Master Database to fetch data and performs
numerous
From: sqlite-users-boun...@sqlite.org on behalf of Sachin.2.Gupta
Sent: Mon 11/8/2010 4:47 AM
To: sqlite-users@sqlite.org
Subject: EXTERNAL:[sqlite] SQLite Memory Usage
Hi,
We are trying to Integrate SQLite in our Application and are trying to populate
as a Cache. We are planning
: Quarta-feira, 17 de Fevereiro de 2010 16:38:27 (GMT-0300)
Auto-Detected
Assunto: [sqlite] Memory usage – one data base versus two smaller ones
For some reasons it is more convenient for the project to
have a few smaller databases with unrelated data than one containing
everything. My only
On Fri, Feb 19, 2010 at 09:39:08AM -0300, Israel Lins Albuquerque scratched on
the wall:
Samuel,
Each one attached database has its own page cache with 2000
(default number of pages in cache) * 1024 (default size in
bytes of a page),
On many Windows systems it will default to 4096. It
For some reasons it is more convenient for the project to
have a few smaller databases with unrelated data than one containing
everything. My only concern is RAM memory.
How much burden/memory overhead an additional database would introduce?
Thank you for your input,
Samuel
I am running into issues where I am running out of memory on my embedded
app. I have stored 10K records in a table. There is an index on a key
field and a sort field. An external program needs to reconcile its data
with the data in this table. It does so 200 records at a time. The code I
am
I fixed this by reducing the cache size from 2000 to 200. I may want to
adjust some more but will continue to test.
Chris
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sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Hello guys,
I am trying to write you again about a simple question... how can I
limit sqlite memory usage during insert commands? It seems that the
amount of memory usage increases when the number of objects inserted
into the database is increased and memory is never freed.
I tried to set
On Apr 21, 2009, at 8:08 AM, Marco Bambini wrote:
Hello guys,
I am trying to write you again about a simple question... how can I
limit sqlite memory usage during insert commands? It seems that the
amount of memory usage increases when the number of objects inserted
into the database
http://www.creolabs.com/payshield/
On Apr 21, 2009, at 2:11 PM, D. Richard Hipp wrote:
On Apr 21, 2009, at 8:08 AM, Marco Bambini wrote:
Hello guys,
I am trying to write you again about a simple question... how can I
limit sqlite memory usage during insert commands? It seems
On Apr 21, 2009, at 8:22 AM, Marco Bambini wrote:
Yes, executing sqlite3_memory_used () after 183,000 INSERT statement
returns: 106,766,848.
Database is never closed during application lifetime.
Each statement is prepared, stepped and properly finalized.
We do that kind of test all the
The database is on-disk ... does huge not committed transactions uses
memory?
--
Marco Bambini
http://www.sqlabs.com
http://www.creolabs.com/payshield/
On Apr 21, 2009, at 2:27 PM, D. Richard Hipp wrote:
On Apr 21, 2009, at 8:22 AM, Marco Bambini wrote:
Yes, executing
On Apr 21, 2009, at 9:07 AM, Marco Bambini wrote:
The database is on-disk ... does huge not committed transactions uses
memory?
It should do writes to disk periodically to free up memory, once you
hit your cache_size limit.
What is cache_size set to. What are the output from
cache_size is set to default 2000, page size is 1K...
here you go the output of sqlite3_status:
2009-04-21 15:24:25 SQLITE_STATUS_MEMORY_USED current: 106704136 high:
109873952
2009-04-21 15:24:25 SQLITE_STATUS_PAGECACHE_USED current: 0 high: 0
2009-04-21 15:24:25
On Apr 21, 2009, at 9:25 AM, Marco Bambini wrote:
cache_size is set to default 2000, page size is 1K...
here you go the output of sqlite3_status:
2009-04-21 15:24:25 SQLITE_STATUS_MEMORY_USED current: 106704136 high:
109873952
2009-04-21 15:24:25 SQLITE_STATUS_PAGECACHE_USED current: 0
On Apr 21, 2009, at 9:25 AM, Marco Bambini wrote:
cache_size is set to default 2000, page size is 1K...
here you go the output of sqlite3_status:
2009-04-21 15:24:25 SQLITE_STATUS_MEMORY_USED current: 106704136 high:
109873952
2009-04-21 15:24:25 SQLITE_STATUS_PAGECACHE_USED current: 0
On Apr 21, 2009, at 10:54 AM, Marco Bambini wrote:
and the read lock is released when the virtual machine is finalized
right? ... even if the writer is inside a BEGIN IMMEDIATE transaction?
Correct.
D. Richard Hipp
d...@hwaci.com
___
On Apr 21, 2009, at 7:12 PM, Marco Bambini wrote:
Hello Dr. Hipp,
I was finally able to track down the issue ... the problem is due to
the fact that after each write operation the client executes a query
like:
SELECT 123 AS changes; (the number 123 changes all the time)
this select
Hello guys,
I need your help in order to solve a very annoying issue with sqlite
3.6.11.
I have two opened db inside my application and when I insert 180,000
rows inside a transaction I can see heap memory usage that exceeds
100MB (data is written twice so I have 2 transactions inside two
Hello,
My multi-threaded application has various sqlite db's open simultaneously,
in memory using the :memory: keyword, disk based db's and at times, tmpfs
(ram) db's. Is there a way to view each individual database's memory usage?
I found the functions sqlite3_memory_used() and
Hello,
My multi-threaded application has various sqlite db's open simultaneously,
in memory using the :memory: keyword, disk based db's and at times, tmpfs
(ram) db's. Is there a way to view each individual database's memory usage?
I found the functions sqlite3_memory_used() and
Hello,
My multi-threaded application has various sqlite db's open simultaneously,
in memory using the :memory: keyword, disk based db's and at times, tmpfs
(ram) db's. Is there a way to view each individual database's memory usage?
I found the functions sqlite3_memory_used() and
Hello,My first mail attempt appears not to have gotten through yesterday due
to the spam storm.
My multi-threaded application has various sqlite db's open simultaneously,
in memory using the :memory: keyword, disk based db's and at times, tmpfs
based db's. Is there a way to view each individual
Hello,My application has several sqlite db's open simultaneously, in memory
using the :memory: keyword, disk based db's and at times, tmpfs based db's.
Is there a way to view each individual database's memory usage?
I found the functions sqlite3_memory_used() and
Once again you're missing the point.
Of course you can get a malloc/free implementation that performs
garbage collection, such as Boehm's conservative GC. But C garbage
collection and malloc/free memory fragmentation are quite different
things. You can still get heavily fragmented memory with
Not only applicable to real time systems. If you want a program to run
with stability over a long time the first step it to eliminate frees and
if malloc is used confine it to the intialization.
Jim Dodgen wrote:
One other note, just about all real-time systems limit the dynamic
allocation
-Original Message-
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: Monday, November 19, 2007 7:36 AM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Memory Usage
Not only applicable to real time systems. If you want a program to
run
with stability over a long time the first
On Nov 19, 2007, at 12:36 PM, James Dennett wrote:
-Original Message-
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: Monday, November 19, 2007 7:36 AM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Memory Usage
Not only applicable to real time systems. If you want a program
: Re: [sqlite] Memory Usage
Not only applicable to real time systems. If you want a program to
run
with stability over a long time the first step it to eliminate frees
and
if malloc is used confine it to the intialization.
I have to challenge this, not because it's entirely wrong (it's
-Original Message-
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: Monday, November 19, 2007 12:14 PM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Memory Usage
Dynamic allocation is not the problem, it is malloc and free. there
is
a difference between being certain
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Memory Usage
Not only applicable to real time systems. If you want a program to
run
with stability over a long time the first step it to eliminate frees
and
if malloc is used confine it to the intialization.
I have to challenge
D. Richard Hipp wrote:
On Nov 19, 2007, at 12:36 PM, James Dennett wrote:
-Original Message-
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: Monday, November 19, 2007 7:36 AM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Memory Usage
Not only applicable to real time systems
James Dennett wrote:
-Original Message-
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: Monday, November 19, 2007 12:14 PM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Memory Usage
Dynamic allocation is not the problem, it is malloc and free. there
is
a difference between
Well said.
While it may be true that some memory allocators are lacking, the ones I
use are quite good. I view with great suspicion developers who thinks
they can outsmart the pool allocator. These folks usually add great
complexity while having at best a neutral impact on performance and
On 11/19/07, John Stanton [EMAIL PROTECTED] wrote:
Malloc is a concept implemented in various ways, some more successful
than others but all of them hidden from the programmer. Free tries to
give back memory but as you can appreciate unless you use some garbage
collection scheme with
You confused my point which is that your usual malloc/free definitely
does no garbage collection. That does not mean that a C language
program cannot perform garbage collection, just look at a Java run time
package for an example.
If you never execute a free your dynamic memory is
On 11/19/07, John Stanton [EMAIL PROTECTED] wrote:
Joe Wilson wrote:
If a C program employs perfect 1:1 malloc'ing to free'ing, i.e., has no
memory leaks, then garbage collection is irrelevant to the topic of
memory fragmentation. It's not like C can employ a copying garbage
collector
On Nov 17, 2007, at 4:56 PM, [EMAIL PROTECTED] wrote:
If you compile with -DSQLITE_MEMORY_SIZE= then SQLite
will *never* call malloc(). Instead, it uses a static
array that is bytes in size for all of its memory
needs. You can get by with as little as 100K or so of
memory, though
On Nov 18, 2007, at 8:12 AM, Russell Leighton wrote:
On Nov 17, 2007, at 4:56 PM, [EMAIL PROTECTED] wrote:
If you compile with -DSQLITE_MEMORY_SIZE= then SQLite
will *never* call malloc(). Instead, it uses a static
array that is bytes in size for all of its memory
needs. You can
One other note, just about all real-time systems limit the dynamic
allocation of memory because you lose the deterministic behavior,
typically all memory is allocated when the task starts, memory is
usually managed internally in standard sized chunks.
Also for long running tasks
Hi Scott,
My initial evaluation of this database was that it allocates memory for
each operation on the database. It returns the memory only when the
database is committed. So the behavior you see is normal.
Ray Hurst
ScottDerrick wrote:
I am using sqlite3 in a DAQ device. Data can be
Hi Scott,
Ooops..meant to say the following.
My initial evaluation of this database was that it allocates memory for
each operation on the database. It returns the memory only when the
database is CLOSED. So the behavior you see is normal.
Ray Hurst
ScottDerrick wrote:
I am using sqlite3
There must be a way to flush what ever is being cached. Help
It's hard to believe I'm the only guy that wants to keep the database open
and just do inserts, to save CPU time.
Scott
rhurst2 wrote:
Hi Scott,
Ooops..meant to say the following.
My initial evaluation of this
Raymond Hurst [EMAIL PROTECTED] wrote:
Hi Scott,
Ooops..meant to say the following.
My initial evaluation of this database was that it allocates memory for
each operation on the database. It returns the memory only when the
database is CLOSED. So the behavior you see is normal.
Ray
Dr. Hipp,
thanks, I'm sure I can use one or more of your solutions below to solve my
problem...
Scott
SQLite does maintain a cache of the database file. It
will hold up to 2000 pages by default. You can change
the cache size by using the PRAGMA cache_size=N pragma.
You can set N as small as
I am using sqlite3 in a DAQ device. Data can be viewed on the unit using a
Rails enabled web server.
The data is being stored to the database every 1 to 5 seconds. I wanted to
leave the the database open for as long as teh application is running and
then use a IMMEDIATE, PREPARE-INSERT(x),
On 10/30/06, Ben Clewett [EMAIL PROTECTED] wrote:
Hi Numo and others,
I am very glad to hear the consensus is that there is nothing wrong with
libsqlite3.so.0.8.6.
However the fact is that the 'open' still acquires 16MB of memory.
Immediately Before:
VmSize: 8572 kB
VmLck:
Nuno,
Thanks for the excelent description of my error. I have learnt a little
more about Linux virtual memory model. Very glad to hear Sqlite is as
perfect as ever :)
My problem, which is definitely my problem, is that 90 x 16MB of
reserved memory is still a loss of 1.4G. Especially as I
Ben Clewett [EMAIL PROTECTED] wrote:
Is the allocation of 4108 KB normal for Sqlite?
No. Not for me. If you open the same database using the
command-line client, how much memory does it use?
Why, then run from xined, is the memory allocation four times as much?
Why is just Sqlite effected
On 10/30/06, Ben Clewett [EMAIL PROTECTED] wrote:
Nuno,
Thanks for the excelent description of my error. I have learnt a little
more about Linux virtual memory model. Very glad to hear Sqlite is as
perfect as ever :)
My problem, which is definitely my problem, is that 90 x 16MB of
reserved
I don't know whether I am right in this perspective. Just to know
whether sqlite is causing the high memory usage, comment the commands
(statements) related to sqlite and check the memory status.
Thanks,
Lloyd.
On Mon, 2006-10-30 at 12:45 +, Nuno Lucas wrote:
On 10/30/06, Ben Clewett
Hi Nuno,
Sqlite is one mailing list I have consistently found absolutely excelent
knowledge, thanks again for your information. I don't know whether this
should be off-thread now, but I don't have your email address.
I'll have to research memory allocation further. But I'm glad to know
Ben Clewett wrote:
If you know a good URL on Linux virtual memory and allocation, I
would be extremely interested.
You could try:
http://virtualthreads.blogspot.com/2006/02/understanding-memory-usage-on-linux.html
The next two link to pages with links to a PDF of the gorman book
What happens when you write a simple test program to open the DB? You
can certainly run Valgrind on that or even put in your own debug
statements to examine the heap usage.
This would be the first thing to do in indentifying the problem. It
will tell you whether to look at Sqlite or your
If you are seeing different memory usage patterns for identical code
based on if it is run from xinetd or on your command line, then I would
check the process environment that xinetd creates. Maybe some component
that sqlite uses is acting differently based on environment variables?
I
At 14:40 30/10/2006, you wrote:
I am suffering a 4GB memory 64-bit Zeon Linux box, which keeps
crashing with 'No available memory'. I'm finding it quite hard to
break down the memory into what processes are paged-in and using
what's available. Sqlite seemed to be the smoking gun, so although
Dear Sqlite,
I very much enjoy using Sqlite, it is extremely useful.
I have a memory usage query.
I am linking to libsqlite3.so.0.8.6. After calling sqlite3_open(...) I
find my programs data memory jumps by 16392 Kb.
This seems a lot. The database I am opening is only 26K in size.
I have
On 10/27/06, Ben Clewett [EMAIL PROTECTED] wrote:
I am linking to libsqlite3.so.0.8.6. After calling sqlite3_open(...) I
find my programs data memory jumps by 16392 Kb.
This seems a lot. The database I am opening is only 26K in size.
There are many different ways of memory jump (like
At 18:00 27/10/2006, you wrote:
Dear Sqlite,
I very much enjoy using Sqlite, it is extremely useful.
I have a memory usage query.
I am linking to libsqlite3.so.0.8.6. After calling
sqlite3_open(...) I find my programs data memory jumps by 16392 Kb.
This seems a lot. The database I am
Most probably it will be a memory leak in your program. We must release
the dynamically allocated memory ourselves. So check whether you are
forgetting to do that. Most probably that leak will be happening inside
some loops or repeatedly calling functions.
On Fri, 2006-10-27 at 17:00 +0100, Ben
Hi all,
I have a program that uses SQLite and it frequently updates and adds to the
database. However, despite my freeing the result when done memory usage
continues to increase over time. The database has currently has 940 rows and
uses sever selects and a select with limit and offset. Also only
On Wed, 13 Jul 2005, Joey Ekstrom wrote:
Would sqlite perform well in a web application where each user got
their own database to operate on? I know that the size of the sqlite
library is small, but what is the memory footprint after opening the
database? Would it be prohibitive to having a
On 7/14/05, Christian Smith [EMAIL PROTECTED] wrote:
On Wed, 13 Jul 2005, Joey Ekstrom wrote:
Would sqlite perform well in a web application where each user got
their own database to operate on? I know that the size of the sqlite
library is small, but what is the memory footprint after
,
as long as you promise not to start whining about multi user issues. :-)
FOOTPRINT, FOOTPRINT, FOOTPRINT...
Fred
-Original Message-
From: Christian Smith [mailto:[EMAIL PROTECTED]
Sent: Thursday, July 14, 2005 9:23 AM
To: sqlite-users@sqlite.org; Joey Ekstrom
Subject: Re: [sqlite] Memory
On Thu, 2005-07-14 at 08:40 -0600, Joey Ekstrom wrote:
On 7/14/05, Christian Smith [EMAIL PROTECTED] wrote:
Each database would have it's own page cache, which will be the biggest
memory user. So, with 1K pages, and up to 2000 pages by default, your
cache footprint would be:
1024 * 2000 *
Would sqlite perform well in a web application where each user got
their own database to operate on? I know that the size of the sqlite
library is small, but what is the memory footprint after opening the
database? Would it be prohibitive to having a 500+ relatively small
database open
Is it possible to limit the amount of memory SQLite uses while
processing an aggregate query?
I have a 1GB database containing a single table. Simple queries
against this table (SELECT COUNT(*), etc.) run without using more than a
few MBs of memory; the amount used seems to correspond
On Thu, 2005-03-24 at 10:09 -0500, Thomas Briggs wrote:
I have a 1GB database containing a single table. Simple queries
against this table (SELECT COUNT(*), etc.) run without using more than a
few MBs of memory; the amount used seems to correspond directly with the
size of the page cache,
am I oversimplifying
this? :)
Thanks
-Tom
-Original Message-
From: D. Richard Hipp [mailto:[EMAIL PROTECTED]
Sent: Thursday, March 24, 2005 10:32 AM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Memory usage for queries containing a
GROUP BY clause
On Thu, 2005-03-24
On Thu, 2005-03-24 at 10:57 -0500, Thomas Briggs wrote:
After posting my question, I found the discussion of how aggregate
operations are performed in the VDBE Tutorial; that implies that memory
usage will correspond with the number of unique keys encountered by the
query, but I appreciate
: Thursday, March 24, 2005 11:19 AM
To: sqlite-users@sqlite.org
Subject: RE: [sqlite] Memory usage for queries containing a
GROUP BY clause
On Thu, 2005-03-24 at 10:57 -0500, Thomas Briggs wrote:
After posting my question, I found the discussion of how
aggregate
operations are performed
To: sqlite-users@sqlite.org
Subject: RE: [sqlite] Memory usage for queries containing a
GROUP BY clause
On Thu, 2005-03-24 at 13:59 -0500, Thomas Briggs wrote:
I feel like I'm missing something, but that didn't seem
to help. I
can see in the code why it should be behaving differently
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