How to store and use the BLOB data in Oracle 11G?

Recentlly,when I tested the Blob data in Oracle11G ,I found that there were too many differences between the SQL
Server and the Orcale on the capabilities.In Orcale ,I created the table like this:
create table point
xid number(10) primary key,
North number(30,15) default null,
West number(30,15) default null,
South number(30,15) default null,
East number(30,15) default null,
Area number(30,15) default null,
Len number(30,15) default null,
Geometry BLOB default null
organization index overflow
tablespace "Tab1"
lob (Geometry) store as securefile
tablespace "Tab1"
enable storeage in row
chunk 4096
pctversion 20
nocache
no logging
compress high
and I stored 10248 rows in this table,
then ,I used "select geometry from point where xid > ? and xid < ?" as the testing SQL langauage in Java and the
programme runed once per 5000 pieces of memory.
the total time used in Orcale is twice more than that in SQLServer.In my Application programs, once the same
orders runed,their differences were three times and more.As usually,the capability of Orcale is more strongger
than the SQLServer.Why?

select geometry from point where xid > ? and xid < ?"Does an index on XID exist?
Are statistics current for table & indexes?

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/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:451:36: error: 'struct usb_serial_port' has no member named 'number'
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/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_get_termios':
/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:534:17: error: invalid type argument of '->' (have 'struct ktermios')
&tty->termios->c_cflag, &baud);
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/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:556:36: error: 'struct usb_serial_port' has no member named 'number'
dbg("%s - port %d", __func__, port->number);
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baud = tty->termios->c_ospeed;
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dbg("%s - port %d", __func__, port->number);
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/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_tiocmset_port':
/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:871:36: error: 'struct usb_serial_port' has no member named 'number'
dbg("%s - port %d", __func__, port->number);
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/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:910:36: error: 'struct usb_serial_port' has no member named 'number'
dbg("%s - port %d", __func__, port->number);
^
/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_break_ctl':
/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:932:36: error: 'struct usb_serial_port' has no member named 'number'
dbg("%s - port %d", __func__, port->number);
^
/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c: In function 'cp210x_init':
/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:989:2: error: implicit declaration of function 'usb_serial_register' [-Werror=implicit-function-declaration]
retval = usb_serial_register(&cp210x_device);
^
/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.c:996:3: error: implicit declaration of function 'usb_serial_deregister' [-Werror=implicit-function-declaration]
usb_serial_deregister(&cp210x_device);
^
cc1: some warnings being treated as errors
scripts/Makefile.build:314: recipe for target '/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.o' failed
make[2]: *** [/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source/cp210x.o] Error 1
Makefile:1274: recipe for target '_module_/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source' failed
make[1]: *** [_module_/home/branden/Desktop/Linux_3.x.x_VCP_Driver_Source] Error 2
make[1]: Leaving directory '/usr/lib/modules/3.14.4-1-ARCH/build'
Makefile:4: recipe for target 'all' failed
make: *** [all] Error 2
There is no documentation aside from:
make ( your cp210x driver )
cp cp210x.ko to /lib/modules/<kernel-version>/kernel/drivers/usb/serial
insmod /lib/modules/<kernel-version/kernel/drivers/usb/serial/usbserial.ko
insmod cp210x.ko
Can anyone provide some guidance on the steps to install this driver (or at least where to look) and why there is such a lack of documentation? Are there assumptions here that I am not aware of? How is anyone suppose to use this? If you look in the source there are structures being used as arguments to functions that are never defined as far as I can tell. Perhaps they are part of the header files included at the top, but I could not find some of those on my machine either.
Has anyone had success using this device?

ewaller wrote:<hopeful>Do you have an oscilloscope? </hopeful>
First, I think you have a mismatched Baud. Check your settings in GtkTerm. It could also be the uController. I know you said you have it set for 9600 Baud, but are you sure? The divisor settings are dependent on your clock frequency. Are you sure you are using the correct divisors for the frequency of your crystal? And are you using a crystal, ceramic oscillator, or external oscillator for your time base?
I did not think the internal RC oscillators were that bad off, so I was using the internal 8MHz (DIV8 = 0 fuse bit). Taking your advice I just refused the AVR and set it to use a 20MHz clock (external crystal oscillator) to no avail. The setting in GTKterm is certainly 9600 baud.Referencing the datasheet for the Atmega328P we have:
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That the two devices can communicate tells me they both might be using the same wrong Baud.
I was also suspicious of this .. I do not have a trivial way to test this though. Perhaps some workaround using timers is about the best I can do; no oscilloscope here. Doing a quick high-level test I did find something rather interesting though. Both devices are set to run at 9600 baud. One device is operating at 8MHz (internal oscillator) and the other is using an external 20MHz crystal. I am getting UART communication between the devices, but certainly not the characters I'm sending..
The other problem is that I think you have "Local Echo" turned on in GtkTerm. This places the system in "Half Duplex" mode in which data are not expected to be echoed from the Atmel. That you are getting two characters when the pins are shorted tells me you get the local echo and the loopback. Then the loopback is missing, you still get the local echo. Also, make sure you have parity turned off.
GTKterm does not actually show you what you are typing into the terminal. That is, when you type a character then nothing is displayed to the screen. Presumably this character is sent out as you type it. I was under the impression that local echo would just echo what I type to the screen as well as send it out. Thank you for the clarification.
Last edited by sherrellbc (2014-05-28 03:16:48)

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