I checked with following scenario.
There are 2 script
1) continuously inserting a row at a time in table with exclusive lock mode.
2) executing 4 SELECT queries.
e.g.
o SELECT column1, SUM(column2) FROM table_name WHERE column3 BETWEEN
X AND Y GROUP BY column1;
o SELECT column4, SUM(colum
I had tried on sqlite version 3.7.4.
Let me check it on sqlite version 3.7.5.
Thanks,
Madhav
On Thu, Feb 24, 2011 at 9:19 PM, Richard Hipp wrote:
>
>
> On Thu, Feb 24, 2011 at 4:52 AM, Maddy wrote:
>
>> Hi,
>> I have 4 "SELECT" queries which are accessing same table.
>> When I executed these q
On Thu, Feb 24, 2011 at 4:52 AM, Maddy wrote:
> Hi,
> I have 4 "SELECT" queries which are accessing same table.
> When I executed these queries concurrently using pthreads in Linux, it took
> approximate 10 Seconds.
> But same 4 queries executed sequentially it only took 2 seconds.
> Total Rows i
The reason could be caching, swapping or things like that. When you
execute 4 queries concurrently in different connections each of them
have to create its own memory cache of database pages. Reading data
into cache involves syscalls to Linux kernel for reading from disk.
Although Linux has its own
n Systems
Advanced Analytics Directorate
From: sqlite-users-boun...@sqlite.org [sqlite-users-boun...@sqlite.org] on
behalf of Maddy [im4frie...@gmail.com]
Sent: Thursday, February 24, 2011 3:52 AM
To: sqlite-users@sqlite.org
Subject: EXT :[sqlite] Parallel execu
On 24 Feb 2011, at 9:52am, Maddy wrote:
> I have 4 "SELECT" queries which are accessing same table.
> When I executed these queries concurrently using pthreads in Linux, it took
> approximate 10 Seconds.
> But same 4 queries executed sequentially it only took 2 seconds.
> Total Rows in table are
Hi,
I have 4 "SELECT" queries which are accessing same table.
When I executed these queries concurrently using pthreads in Linux, it took
approximate 10 Seconds.
But same 4 queries executed sequentially it only took 2 seconds.
Total Rows in table are 10.
Sample query is "SELECT column1, sum(col
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