'Read Ahead' functionality in JComboBox

Hi ,
Does any body know how to provide 'Read Ahead' functionality in JCombobox ?
Meaning, if my combo bo has four items say, Apple,Banana,Bag,Cat then
when I type 'B''A', 'Banana' should get selected. When I type 'G', 'Bag' should get selected.
This can be a very useful feature to the user. Can anyone please help me out for this ?
Thanks in advance

See StanislavL's reply in http://forum.java.sun.com/thread.jsp?forum=57&thread=369042&tstart=60&trange=15
--A

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Edited by: gose on Sep 11, 2012 8:31 AM

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@@I'm using Adobe Reader Version 11.0.10 under Windows 7 64-Bit SP1 with all actual updates. When i try to search any word or Phrase of contained in the text of a specific PDF File, then the search Fails. It does not come up with the search item i have keyed in. I did not misspell the search item and it is definitely contained in the text, but the search function does not find it. i am absolutely surethat the search item is in text Format and it is contained in the PDF file, because i can Access and search it when i open this PDF file on an iPad for instance. there it works, but not in my Windows envioenment.
I guess that this problem will not be completely new for you, because other users are discussing this Problem in the Internet as well.
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Kind regards
Guenther
p.s.:
sorry, i am new on thjis platform... how when aproximatrely does one get an answer here?

Hello Pat,
i followed your advise and have used the link contained in point 3 of
your recommendations --- for reference see your response as appended
below (https://cloud.acrobat.com/).
So, in case i made no mistake (?), then you can access the PDF file we
are talking about when you follow this link here:
https://files.acrobat.com/a/preview/0f9d2ce4-b4b9-4223-8fd2-723441d7d2ab***
This PDF file contains a description of an olympus camera. When you open
this PDF file please go to page 6.
Directly under the picture on top of the page (which shows a dark blue
car driving from left to right) you can read the word "Mitziehmodus"
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which the PDF search function of my PDF reader installation does not
find. There are many other words the search function does not find as
well, but let us use this word (Mitziehmodus) as an example to
demonstrate the malfunction as i experience it on my pc.
Meanwhile i have installed a completely new windows-system 7 from
scratch. The PDF reader (11.0.10) is currently the only installed
software. I made this windows 7 installation only to assure that there
is no other software eventually influencing the search function. But the
search function fails again when searching for this word "Mitziehmodus".
One remark still to your statements concerning accented characters.
Character like ä, ö, ü or ß are quite normal characters in writing
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general it does not make much sense to serach for a single character (at
least in my understanding). Searching for ä or ö or ü results in finding
something completely meaningless. But this behaviour shows additionally
that there is something wrong with the search function as it ist
implemented in Adobe Reader.
In general i am convinced that this PDF file will be correct ,
because i can search any search item and find correct search results
when i access this file on my iPad regardless in what so ever combination.
i hope that you can access the problem PDF file following the link i
sent you above.
And i would be happy wehen you could find thze reason for my search
problems.
thank you so far. i appreciate to heare from you soon.
kind regards
Günther
Am 02.01.2015 um 03:03 schrieb Pat Willener:
>
Adobe Reader Search function fails
created by Pat Willener <https://forums.adobe.com/people/pwillener> in
/Adobe Reader/ - View the full discussion
<https://forums.adobe.com/message/7058510#7058510>

Oracle Read-Ahead: not the same as look-ahead, yes?

Hi,
I've tried to understand the Oracle Read-Ahead systems, and I think I undersand how it works, though I'd like to assert that I am not mistaken.
From what I've managed to understand in the Oracle documentation, the Oracle read-ahead mechanism is mostly used for sequential accesses of data blocks. For example, to perform operations like table scans.
In such cases, Oracle will for example use a physical operation called scattered read.
The scattered read, in turn, is configured in the ini.ORA by a parameter name something like db_multiblock_read_count. Having a multiblock read count of 60, will make the scattered read operation read 60 sequential data blocks from disk, starting with the data block that was requested in the operation.
From what I've gathered, this is the basis of the Read-ahead mechanism. It is use mult block operations do read data instead of single bock operations.
If what I've said so far is correct. There are two things that I'd like to know:
1.
Those 60 blocks read by the sctarred read. Do they go directly into the database buffer cache? Or are they loaded first in to a lower level cache, like a scattered read cache?
Thus, if the table scan requested the page 1. And the scattered read operation fetched the database pages 1 to 60. I assume that only page 1 would be transfered to the buffer cache. Later on, when the table scan requested for page 2, the buffer cache would retrieve that page from the scattered read cache into the buffer cache. Or is this completly wrong? And when the scattered read gets pages 1 to 60. It automatically dumps those data pages into the buffer cache into random positions of the main buffer?
2.
With Oracle read-ahead, table scans and other such physical operations will always incur scattered read waits periodically. For example, every 60 pages the table scan incurs in another scattered read wait correct?
3.
Reading-ahead In oracle only anticipates the database page needs of a physical operator a specific point in time, yes? The following does not happen:
While the table scan is currently on page 50, having another 10 more pages left in the database buffer, some background process decides that it is a good idea request another fetch for 50 more data pages. In such a way that the forground thread processing the table scan never has stop in read IO.
This would be called looking-ahead, and it is not an Oracle feature, is it?
Thank you for your insight.
I've performed some tests where though the table size of a data transformations remain the same (1GB) but the time I take to process the source table into my output varies. The processing time for each record increased greatly from test to test. But I noticed that the wait time of the data transformation remained constant, though the cpu time increased greatly. THe increase in CPU time means that the Time Until Next Buffer fetch was reduced, which would give more time for the system to look-ahead. Eventally I could have made the CPU time so great, that if REad IO was being performed in anticipation it would be theortically possible for the READ wait time to be 0. Which I know is not going to happen. So I'd just to be certain of how the read-ahead works.
My best regards.

sono99 wrote:
Hi,
I've tried to understand the Oracle Read-Ahead systems, and I think I undersand how it works, though I'd like to assert that I am not mistaken.
From what I've managed to understand in the Oracle documentation, the Oracle read-ahead mechanism is mostly used for sequential accesses of data blocks. For example, to perform operations like table scans.
In such cases, Oracle will for example use a physical operation called scattered read.
The scattered read, in turn, is configured in the ini.ORA by a parameter name something like db_multiblock_read_count. Having a multiblock read count of 60, will make the scattered read operation read 60 sequential data blocks from disk, starting with the data block that was requested in the operation.
From what I've gathered, this is the basis of the Read-ahead mechanism. It is use mult block operations do read data instead of single bock operations.
Am not sure if you meant reading multiple blocks at the same time or Read ahead cache features provided by some storage devices. But to me it seems you are talking about MBRC (Multiblock read count) and not about read ahead cache provided by storage vendors.
If what I've said so far is correct. There are two things that I'd like to know:
1.
Those 60 blocks read by the sctarred read. Do they go directly into the database buffer cache? Or are they loaded first in to a lower level cache, like a scattered read cache?
Thus, if the table scan requested the page 1. And the scattered read operation fetched the database pages 1 to 60. I assume that only page 1 would be transfered to the buffer cache. Later on, when the table scan requested for page 2, the buffer cache would retrieve that page from the scattered read cache into the buffer cache. Or is this completly wrong? And when the scattered read gets pages 1 to 60. It automatically dumps those data pages into the buffer cache into random positions of the main buffer?
If my mbrc is 60, and none of the blocks are in buffer and table size is more than 60 blocks then entire 60 blocks would get transferred to buffer cache. There is nothing called scattered read cache in the architecture of Oracle.
2.
With Oracle read-ahead, table scans and other such physical operations will always incur scattered read waits periodically. For example, every 60 pages the table scan incurs in another scattered read wait correct?
Yes db file scattered read wait event would mean that another physical IO has been initiated for fetching next blocks of records.
3.
Reading-ahead In oracle only anticipates the database page needs of a physical operator a specific point in time, yes? The following does not happen:
While the table scan is currently on page 50, having another 10 more pages left in the database buffer, some background process decides that it is a good idea request another fetch for 50 more data pages. In such a way that the forground thread processing the table scan never has stop in read IO.
This would be called looking-ahead, and it is not an Oracle feature, is it?
Yes I do not think so it is an Oracle feature but some storage vendor provides it. It is also known as Read ahead.
Thank you for your insight.
I've performed some tests where though the table size of a data transformations remain the same (1GB) but the time I take to process the source table into my output varies. The processing time for each record increased greatly from test to test. But I noticed that the wait time of the data transformation remained constant, though the cpu time increased greatly. THe increase in CPU time means that the Time Until Next Buffer fetch was reduced, which would give more time for the system to look-ahead. Eventally I could have made the CPU time so great, that if REad IO was being performed in anticipation it would be theortically possible for the READ wait time to be 0. Which I know is not going to happen. So I'd just to be certain of how the read-ahead works.
My best regards.I did not understood your last para.
Regards
Anurag

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'Read Ahead' functionality in JComboBox

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