Event IDs 233, 107, 474: Database Corruption - Fix Guide 2025

# Stop corruption from spreading
Dismount-Database "Mailbox Database 01" -Confirm:$false

# Verify dismount
Get-MailboxDatabase "Mailbox Database 01" | Select-Object Name, Mounted

cd "D:\ExchangeDBs\DB01"

# Check database header for state
ESEUTIL /MH DB01.edb | Select-String "State|Last"

# Run full integrity check (10-60 min depending on size)-60 min depending on size)
ESEUTIL /K DB01.edb

# If corruption found, output shows:
# "Corruption detected at page XXXXX"
# "Database corruption detected. ESEUTIL /P required."

# Check System log for disk errors
Get-EventLog -LogName System -After (Get-Date).AddHours(-24) |
    Where-Object { $_.EventID -in @(7,11,15,153) -and $_.EntryType -eq "Error" } |
    Format-Table TimeGenerated, EventID, Message -AutoSize

# If hardware errors found, do NOT repair yet - replace hardware first

# 1. Backup corrupt database
Copy-Item "D:\ExchangeDBs\DB01\DB01.edb" \
    -Destination "D:\Backup\DB01-corrupt-$(Get-Date -Format yyyyMMdd).edb"Get-Date -Format yyyyMMdd).edb"

# 2. Stop Exchange services
Stop-Service MSExchangeIS -Force

# 3. Run hard repair (1-6 hours)1-6 hours)
cd "D:\ExchangeDBs\DB01"
ESEUTIL /P DB01.edb

# 4. Run defragmentation
ESEUTIL /D DB01.edb

# 5. Verify state
ESEUTIL /MH DB01.edb | Select-String "State"

# 6. Start services and mount
Start-Service MSExchangeIS
Start-Sleep -Seconds 30
Mount-Database "Mailbox Database 01"

# 7. Run logical repair
Get-Mailbox -Database "Mailbox Database 01" | ForEach-Object {
    New-MailboxRepairRequest -Mailbox $_.Alias \
        -CorruptionType ProvisionedFolder,SearchFolder,AggregateCounts,Folderview
}