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When you suspect data block corruption, you can use the Oracle-provided DBVERIFY utility. The DBVERIFY tool is used from the operating system level. It checks the structural integrity of the database files for corruption. To illustrate the use of DBVERIFY, the following example verifies a file on a Windows platform (the command works in the same way on UNIX platforms). You can easily write a script that will perform the datafile verification and use crontab to schedule it on a regular basis. Listing 15-10 shows the results of using the DBVERIFY utility. Listing 15-10. Output of the DBVERIFY Utility $ dbv file=/u01/orcl/oradata/system01.dbf DBVERIFY: Release 11.1.0.6.0 - Production on Sun Mar 30 15:53:46 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved. DBVERIFY - Verification starting : FILE = =/u01/orcl/oradata/system01.dbf DBVERIFY - Verification complete Total Pages Examined : 19200 Total Pages Processed (Data) : 4404 Total Pages Failing (Data) : 0 Total Pages Processed (Index): 1245 Total Pages Failing (Index): 0 Total Pages Processed (Other): 2663 Total Pages Processed (Seg) : 0 Total Pages Failing (Seg) : 0 Total Pages Empty : 10888 Total Pages Marked Corrupt : 0 Total Pages Influx : 0 Highest block SCN : 935681 (0.935681) $ This example shows a simplified use of the DBVERIFY utility, which is invoked by the command DBV on both the UNIX and Windows platforms. The keyword FILE indicates the datafile you want to check for corruption. As you can see, the total pages marked as corrupt are 0, which means the datafile is free of any structural integrity problems it is not corrupted. generate pdf417 c# 2D barcode PDF417 library download | SourceForge.net
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How to Read PDF 417 on Image & Document in C# .NET Project. ... PDF417 ); // read all barcodes in the document Barcode [] barcodes = BarcodeReader . Though using the DBVERIFY utility is simple, it s severely limited by the fact that it can t be used to fix corrupted data. In Oracle8i, Oracle introduced the DBMS_REPAIR package, which can detect and fix data block corruption while datafiles are online. To use this utility, you first need to log in as the user SYS and then create a pair of tables: the first needs to be prefixed with repair_, and the second is called the orphan_key table. Once you have created the table repair_table, you re ready to run the DBMS_REPAIR package. The repair_table table will log all the information about corrupt data. The CHECK_OBJECT procedure of the DBMS_REPAIR package detects corrupted data blocks and recommends fixes. After the execution of the CHECK_OBJECT procedure, the table repair_table is queried on the columns OBJECT_ NAME and CORRUPT_DESCRIPTION to identify if and what type of data block corruption exists. I discuss various ways of fixing data block corruption in the next chapter, because one of the ways to fix the problem involves restoring the database from backups. c# pdf417 open source Packages matching PDF417 - NuGet Gallery
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Complete C#.NET source code to generate PDF-417 images and adjust barcode size with . ... How to Generate, Resize PDF417 Barcode Images in C# Class. each receiver, but the receivers don t process them immediately. When the sender instructs the transaction coordinator to commit the transaction, the coordinator starts the two-phase commit process by doing the following: 1. The coordinator asks if each receiver would be able to commit the notifications received but not processed yet. 2. If all receivers answer affirmatively, the coordinator sends a CommitTransaction command to each receiver. If even one of the receivers answers negatively, the coordinator sends a RollbackTransaction command to each receiver. Two-phase commits are not infallible and have the potential to leave the system in an undetermined state if a failure occurs at certain critical points in the commit process. For example, the coordinator might have received a collective affirmative answer for the first phase of the commit. During the second phase, one of the receivers might die after some of the receivers already performed their commit. Dealing with this type of failure scenario and others requires adding complexity to the commit phase, the details of which are beyond the scope of this book. c# pdf417 PDF-417 Barcode Encoding and Generating inVisual C# and VB ...
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You can also use ZXing.net nuget package which will be more simple and easy to use. private byte[] GenerateBarCodeZXing(string data) { var ...
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