Tag: corruption

How to Repair Logical and Physical Exchange Database Corruption?

Exchange database may get corrupt due to several software and hardware related issues. It can obstruct the email flow and adversely affect the business. Thus, it’s critical to fix database corruption. In this guide, we discussed Exchange database corruption, its causes, and solutions to repair corrupt Exchange database. We’ve mentioned various Exchange utilities and third-party Exchange recovery software that can help you repair corrupt database and recover lost mailboxes. We’ve also mentioned some important tips that can help you prevent database corruption.

Exchange database (EDB) files are mailbox database files where mailboxes are created that stores user information and data, such as emails, contacts, attachments, notes, calendar, etc. An Exchange admin can create a mailbox database via Exchange Admin Center (EAC) or Exchange Management Shell (EMS) cmdlets. From Exchange 2016, each mailbox database can have its properties that can be configured via EAC or EMS. Also, each EDB folder consists of the following three files:

  • Exchange Database File (.edb)
  • Transaction logs (.log)
  • Checkpoint files (.chk)

However, these mailbox database files sometimes get damaged or corrupt that results in the loss of all information and data stored in the database (.edb) files.

Exchange database corruption not only affects the business continuity as it hinders the email flow and communication but also leads to data loss. In this guide, we discussed some reasons that may lead to Exchange database corruption. Also, the solutions to fix Exchange database corruption, along with some important tips on how you can avoid Exchange database corruption and data loss.

Reasons for Exchange Database Corruption

Exchange database gets corrupt due to several reasons, such as:

  • Power Outage or Unexpected Shutdown
  • Hardware Issue
  • Software Problem
  • Exchange Server Crash
  • Dirty Shutdown
  • Incompatible Antivirus Software
  • Low Storage Space
  • Missing or Deleted Exchange Log Files

Types of Exchange Database Corruption

Exchange database corruption can be segregated into two categories:

  1. Logical Corruption

It is often referred to as Soft Corruption as it occurs due to inconsistency caused by invalid index entries, jet engine database failure, etc. at various levels.

For instance, at database level, there could be cross-object chain linkage issue due to database engine failure or invalid entries. At application level, there could be damage to the database file header or incorrect access control levels.

  1. Physical Corruption

Physical corruption occurs due to hardware-related issues, such as a hard drive problem. It is considered the lowest level of database corruption and causes severe damage to the Information Store that contains the database file. During physical corruption, you may encounter the following errors:

  • 510 JET_errLogWriteFail
  • 529 (JET_errLogDiskFull)
  • 1018 (JET_errReadVerifyFailure)
  • 1032 (JET_errFileAccessDenied)
  • 1216 (JET_errAttachedDatabaseMismatch)
  • 548 (JET_errLogSequenceEndDatabasesConsistent)
  • 528 (JET_errMissingLogFile)

Plus, you can’t mount a corrupt database when it dismounts. In such cases, you can use the backup to restore database. However, if backup is not available or obsolete, you must either repair Exchange database with the help of Exchange recovery utilities or recover mailboxes to Outlook importable PST by using a third-party Exchange recovery software.

Manual Methods to Repair Exchange Database Files

MS Exchange comes with two database diagnostic and recovery tools for Exchange database repair. These are:

  1. EseUtil (Extensible Storage Engine Utilities)

A command line-based Exchange recovery tool that helps Exchange admins resolve and repair Exchange db corruption. It is also used to perform various database maintenance tasks, such as defragmentation, integrity check, reduce database size, etc. to avoid corruption.

  1. IsInteg (Microsoft Exchange Information Store Integrity Checker)

IsInteg is also a command-line tool that is used to check the integrity of repaired Exchange database. It understands the relationship between records and tables, and turns them into messages and folders.

You can follow our detailed guide on How to use EseUtil for Exchange Database Repair. However, you may need to perform Hard Recovery by using Eseutil /p that may take significant time to complete, based on the database size. After Hard Recovery, you must run the IsInteg tool for Index Repair and check the integrity of the repaired database. You can find the tool at the following location,

C:>Program Files>Exchsrvr> bin

Then open Command Prompt, navigate to the above location (using cd), and then run the IsInteg test by entering the following command,

Isinteg –s -fix –test alltestsCopy Code

You can repeat the IsInteg test as many times as you want to get rid of all errors. Once the errors are fixed, you can mount the database.

However, before Hard Recovery is started, you are reminded about the data loss that you must confirm and accept to proceed further.

Accepting this data loss warning will start the repair process and may fix the corrupt Exchange database after deleting non-recoverable mailboxes and mail items. Besides, there are several other issues that you may encounter while using EseUtil for repairing Exchange database. These are:

  • It may delete mailboxes and data during database recovery
  • It may fail to fix the database if corruption is high
  • Consumes a lot of time
  • Requires good technical skills to execute several commands with accuracy
  • A typo in command or wrong command can cause further damage to the database or permanent data loss
  • If STM and EDB does not match, EseUtil will not work
  • Requires a lot of storage space
  • It doesn’t work when STM file is missing

So if you encounter any of these issues during database repair via EseUtil, you can use a third-party Exchange repair tool.

Recover Mailboxes from Corrupt Exchange Database via Exchange Recovery Software

When the Exchange database is severely corrupt or can’t be fixed with the help of Exchange’s EseUtil and IsInteg utilities, you can rely on an Exchange recovery software, such as Stellar Repair for Exchange.

The software scans, repairs, and extracts mailboxes from corrupt database file and provides options to save them in PST, EML, PDF, MSG, HTML, and RTF formats. It also features option to import the mailboxes directly to live Exchange or Office 365. With the help of this Exchange database repair software, you can repair any Exchange EDB file and perform a granular search by using the search filters.

The software helps when Exchange utilities fails to fix the problem and the database is damaged with no possible way to fix it. This helps avoid downtime as it’s quite easy-to-use and doesn’t require any additional permissions, besides access to database file.

The tool helps admins restore the email services in no time.

Why Choose Stellar Repair for Exchange over EseUtil?

Here’s a brief comparison between the two utilities that can help you fix logical and physical Exchange database corruption.

 

EseUtil Stellar Repair for Exchange
Deletes unrecoverable or damaged mailboxes and data Repairs corrupt Exchange database file and recovers all data including deleted mailboxes and mail items
It may fail to repair Exchange database even after hard recovery It repairs Exchange database and recovers mailboxes with 100% integrity
It’s a command line-based Exchange recovery tool that requires technical skills It has easy-to-use graphical user interface that makes database recovery faster and convenient
It doesn’t provide any save options It provides options to save recovered mailboxes to PST, MSG, EML, HTML, RTF, & PDF formats or live Exchange and Office 365 accounts
Requires a lot of time and doesn’t work when storage space is low It provides options to save recovered mailboxes to PST, MSG, EML, HTML, RTF, & PDF formats or live Exchange and Office 365 accounts
Does not preview any mailbox or its content during repair or recovery It’s fast and can save recovered mailboxes from corrupt database to internal or external storage drives

 

Tips to Prevent Exchange Database (EDB) Corruption

 

Although Exchange database corruption can be resolved by using Exchange utilities and third-party Exchange repair tools, it is better to prevent EDB corruption in the first place. You can follow the given tips to prevent database corruption:

  • Install server-grade hardware components
  • Maintain a regular backup
  • Use MS Exchange Server Best Practices Analyzer (ExBPA) and perform Exchange maintenance tasks regularly
  • Install Exchange compatible antivirus or antimalware application
  • Ensure enough free storage space in the database and server

 

Conclusion

Exchange database is a storehouse that stores all mailboxes and mailbox items, such as emails, attachments, contacts, notes, etc. When the database (EDB) corrupts, it dismounts that disrupts the email flow, impacts productivity, and may lead to data loss if not resolved quickly. Microsoft provides two Exchange database recovery utilities, EseUtil and IsInteg that can help Exchange and IT admins to repair Exchange database.

Alternatively, you can use a third-party Exchange recovery software, such as Stellar Repair for Exchange that can resolve such issues more quickly and help you restore users’ mailboxes and communication. While the Exchange utilities require preparations, permissions, and large storage space, along with technical knowledge to recover corrupt Exchange database, this Exchange recovery software recovers and restore the mailboxes from a corrupt database to PST or live Exchange in a few clicks. It even recovers accidentally deleted mailboxes from damaged Exchange database.

Is Ethereum the following big anti-corruption tool?

Borders and the rule of law do not restrict global trade relationships; in that sense, they are less susceptible to corruption or oversight. But on the other hand, a website is a wholly automated cryptocurrency platform offering the best features like liquidity, trading tools, and customer support. And this is why a cryptocurrency could be the next big tool for tracking spending, investigating corruption, and enforcing transparency in such complex relationships. If you are interested in trading, you may also know between Ethereum and Bitcoin, their differences.

But does it work? Below mentioned portion explains what the potential Ethereum as an anti-corruption tool is, how it’s been received so far in practice, and questions raised about its adoption as an anti-corruption tool. Ethereum has excellent potential as an anti-corruption tool. 

People can use it in the private and public sectors, where funds are dispersed to different parties across different countries. It is a decentralized platform that runs smart contracts, like small applications that can automate processes in a trustless environment. Let’s discuss how the government can use Ethereum as an anti-corruption tool.

  1. Digital Identity management:

Digital identity management, or digital identity, is a process whereby an individual or group is granted the digital equivalent of a name and can be authenticated by other Cyber Security Tokens (CSATs) and blockchain networks by verifying their identity. In this way, it emulates the true identity and processes of an in-person-to-person relationship.

The power of decentralized Blockchain ledgers like Ethereum is they are a great tool to track identities as people can attach their identifying characteristics, such as surname, first name, age, etc., with just a few clicks. It makes it impossible for identities to be faked since all records are supposed to be held on a public blockchain ledger that any cryptocurrency user can check whether data has been tampered with. Ethereum-based solutions like e-voting could be a great tool by letting people vote on a blockchain.  

These records are generated every time you interact with them, including when you pay bills, update your bank account information, etc. This way, it helps ensure that the identity is authentic and nobody can vote for themself.

  1. Trust Ecosystem:

Trust is created within an ecosystem and lost in a system of uncertainty. It is easy to lose trust in the banks and government at large because we now have no option other than trusting them or losing money. A trust system can be embedded in a decentralized cryptocurrency and its associated services. The blockchain is the most secure platform for trust purposes. The idea is to make these decentralized applications work in a system of trust and continued verification that there are no loopholes. In this context, exploring options like top anonymous bookmakers operating on blockchain technology could offer a unique blend of transparency and privacy.

Ethereum allows people to build a mysterious digital world because everyone can see everything, and nothing is hidden. However, to safeguard trust, two mechanisms are essential:

(a) The open source approach where everything is available on the public Internet and no information is withheld.

(b) The democratic process; therefore, people can vote with their money and time for trusted algorithms that have proven track records of keeping data safe. If these technologies have a proven track record of keeping data safe, companies should trust these.

  1. Ethereum can help the government in the voting process:

Ethereum has a universal platform where all transactions can be recorded and stored on the public ledger. In theory, any law-abiding citizen can use this technology to verify the integrity of voting results and ensure there are no loopholes. In practice, Ethereum-based systems have been used to power elections in Switzerland, Estonia, Zug, and Nord-Estonia. In addition, the three countries have developed their Ethereum based mobile voting devices that allow people to vote from their phones or computers via the Internet (smartphones or tablets). 

  1. Ethereum can help the government to prevent money laundering:

Ethereum has a unique feature called Global Thermostat. The Global Thermostat is an algorithm that controls the rate of issuance of new voting tokens in the system. It is done by a formula that will automatically drop the new token generation rate if it sees an unusual amount of activity within the system.

 It can help governments detect the automatic generation of fake identities to commit fraud or money laundering; for example, the Global Thermostat can be programmed by people to check any suspicious activity and raise the alarm if it sees fake identities being created automatically.  

  1. Ethereum can help the government to prevent funding of terrorism:

Ethereum has a feature that can help governments identify and stop funding terrorists or criminals in a way that would be easy for non-regulated states to implement. For example, suppose your bank account is open on the public Ethereum blockchain. In that case, anyone can see the balance and transfer money from one account to another with an Ethereum address. All transfers are recorded in a public ledger that is fully transparent and searchable. It makes it much easier to prevent money laundering or tax evasion since it makes everything available on the public ledger.