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To minimize this strain, only place tablespaces in backup mode for the shortest possible period of time If the database is stored on appropriate hardware, it may be possible to back it up by using operating system facilities that can split and reinstantiate mirrors Before committing to techniques like this, be sure they are supported by Oracle Corporation on that hardware It may, for example, be necessary to place the whole database in backup mode for the split, or to use the alter system suspend command to freeze all disk I/O Critical to making reliable user-managed backups is the use of SQL scripts that will interrogate the database s data dictionary to extract details of the files that need to be backed up The following SQL*Plus script uses PL/SQL to generate a SQL script hotbackup.



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We use alSourcePause for the first time in this example. It probably behaves exactly as you think it does, so there is not much to say about it.





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You may be wondering why we removed the fast-forward and rewind buttons from the AVPlayback example. The reason is that seeking is more difficult with OpenAL streaming than it is with AVAudioPlayer. OpenAL does have support for seeking. There are three different attributes you can use with alSource* and alGetSource*: AL_SEC_OFFSET, AL_SAMPLE_OFFSET, and AL_BYTE_OFFSET. These deal with the positions in seconds, samples, or bytes. With fully loaded buffers, seeking is pretty easy. But with streaming, you will need to do some additional bookkeeping. The problem is that with streaming, OpenAL can seek only within the range of what is currently queued. If you seek to something that is outside that range, it won t work. In addition, you need to make sure your file handle is kept in sync with your seek request; otherwise, you will be streaming new data in at the wrong position. Thus, you really need to seek at the file level instead of the OpenAL level. Generally, emptying the current queue and rebuffering it at the new position is the easiest solution. (If you don t empty the queue, you may have a lag between when the users requested a seek and when they actually hear it.) But, of course, as you ve just emptied your queue and need to start over, you may have introduced some new latency issues. For this kind of application, probably no one will care though. For simplicity, this was omitted from the example. For the curious, notice that our MyRewindExtAudioData function wraps ExtAudioFileSeek. This is what you ll probably want to use to seek using Extended File Services.

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These represent GIMP s current foreground and background colors, used in all sorts of operations Clicking on either swatch brings up a color chooser You ll use the color swatches a lot in s 3 and 4..

Recall that in this example, we fill only one buffer per update loop pass. This means the game loop must be run through at least five times before we can fill our queue to our designated maximum of MAX_OPENAL_QUEUE_BUFFERS. This brings up the question, What is the best strategy for filling the queue

sql that will identify and copy all the data files that make up the database, as well as backing up the controlfile: 1 set serveroutput on 2 spool hotbackupsql 3 declare 4 cursor c1 is select * from dba_tablespaces where contents<>'TEMPORARY'; 5 cursor c2 (t_name varchar2) is select * from dba_data_files where tablespace_name = t_name; 6 begin 7 for t in c1 loop 8 dbms_outputput_line ('alter tablespace '||ttablespace_name||' begin backup;'); 9 for f in c2(ttablespace_name) loop 10 dbms_outputput_line('host cp -p ' || ffile_name || ' /backup/ocsdb'); 11 end loop; 12 dbms_outputput_line('alter tablespace '||ttablespace_name||' end backup;'); 13 end loop;.

Finally, you may be wondering why we picked five buffers and made our buffers 32KB. This is somewhat of a guessing game. You generally need to find values that give good performance for your case. You are trying to balance different things. The buffer size will affect how long it takes to load new data from the file. Larger buffers take more time. If you take too much time, you will starve the queue, because you didn t get data into the queue fast enough. In my personal experience, I have found 1KB to 64KB to be the range for buffer sizes. More typically, I tend to deal with 8KB to 32KB. Apple seems to like 16KB to 64KB. Some of Apple s examples include a CalculateBytesForTime function, which will dynamically decide the size based on some criteria. (It s worth a look.) I also like powers of two because of a hard-to-reproduce bug I had way back with the Loki OpenAL implementation. When not using power-of-two buffer sizes, I had certain playback problems. That implementation is dead now, but the habit stuck with me. Some digital processing libraries, like for a Fast Fourier Transform (FFT), often prefer arrays in power-of-two sizes for performance reasons. So it doesn t hurt.3

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