Jet_errreadverifyfailure Checksum Error On Database Page
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Eseutil Jet Error
AM Reply | Quote All replies 0 Sign in to vote -1018 is not a good deal at all, in short your DB has corruption within it and it is usually caused by a hardware or firmware related issue. Most of the time these occur somwhere within the storage subsystem, i.e. firmware upgrade or lack of firmware upgrade, Controller issue, cabling, disk, disk arrays, operation terminated with error -1811 (jet_errfilenotfound, file not found) etc, however they can also be caused by memory updgrades or failures, Motherboard issues etc. The 1018 tells you the DB is already damaged and if you see these its very bad and needs to be addressed ASAP else the DB's are sure to fail and the more stress you put on them the faster the chance of failure, i.e. database backups, defrags and repairs etc are not recommended at all until you solve the hardware issue. So here is what I would reccomend. General Review: Whats changed recently? i.e. any hardware, memory, motherboard, any firmware updates on anything at all?Event Log Review: Look at your Application Log, how long have these 1018's been occuring? Look at your System event log for errors and pay close attention to any errors regarding disk, memory or MB and report back Protect: I would dismount the database & copy that database and any others off to a secure, safe drive that is NOT connected to this systemAction: Depending on what you find in your review there are really two options A: If you had a recent change that is easily identifiabl
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Case and Cooling Fetish CPU & Motherboard Technologia Mobile Computing Outpost Networking Matrix Other Hardware Agora Classifieds http://arstechnica.com/civis/viewtopic.php?t=747409 Ars DIY Forum (Name TBD!) Operating Systems & Software Battlefront http://www.edb.2pst.net/blog/exchange-error-1018.html Microsoft OS & Software Colloquium Linux Kung Fu Windows Technical Mojo Distributed Computing Arcana Macintoshian Achaia Programmer's Symposium The Server Room Ars Lykaion Gaming, Extra Strength Caplets The Lounge The Soap Box The Boardroom The Observatory jet error Ars Help & Feedback Ars Subscription Member Areas Image Galleries HELP!! Corrupted Exchange database... 14 posts Guido331 Ars Centurion Registered: May 10, 2001Posts: 315 Posted: Sun Dec 08, 2002 1:19 am I rebooted my exchange 2000 server (all SP3) yesterday because it was acting wierd and when it came up I noticed that I could no longer get into jet_errreadverifyfailure checksum error outlook. I checked and made sure all the exchange services were running and then got the idea to look in system manager at the mailbox store. Oh no, I thought, it had the infamous little red dot on it meaning it wasn't mounted. I tried re-mounting but got the following error: "the database files in this store are corruptedID no: c104173bExchange system manager"My heart sank becase my tape backup server has been offline for about a week for unrelated repairs. I have 15 mailboxes on this server totaling about 1.8GB. I just found out that my backup files (made by ntbackup) are corrupted. No current backup... (please don't flame me for not having a decent backup. I realize my folly and have plans to correct that as soon as I get through this.)When I try to run eseutil I get: "C:\Program Files\Exchsrvr\MDBDATA>eseutil /r priv1.edbMicrosoft(R) Exchange Server(TM) Database UtilitiesVersion 6.0Copyright (C) Microsoft Corporation 1991-2000. All Rights Reserved.Initiating RECOVERY mode... Logfile base name: priv1.edb Log files:
page-level corruption of database. In Exchange Server, there is built–in facility that could help to detect and fix damage done to the database file at file–system (page) level. The most common error that a DBA administrator could come across if the EDB file is corrupt at page level is –1018 JET_errReadVerifyFailure (most probably while online backup creation). Database of Exchange Server has possibility to get corrupted at different levels, depending upon what wrong has happened to it. For example: if the page of EDB file is corrupt or the index of database has been dis-ordered. According to the scenario, DB corruption of Exchange Server is categorized as Physical corruption and Logical corruption. Meanwhile, if file-system level damage to database has to be verified, Eseutil can be used. Using the /mh switch against the DB, its header can be checked out where checksum value stability determines integrity of the database. How to Verify Exchange Database Page Corruption? At user's end, Exchange database is like any other system-file saved with .edb file extension. Meanwhile, at a logical level, an EDB file is made up of 4KB pages (depending upon versions of Exchange and Windows OS, it can be multiple of 4 KB too). These pages are organized in B–Tree structure that ensures minimum I/O operations. These pages in EDB file can have data stored in or it may have pointers that link a page to another page. Such database structure ascertains that while any query is made, faster traversal to the tree is done for quick results. Further, tables, indexes have separate B-tree structure to manage data which is known as B+ Tree. The first two pages of Exchange database EDB file are reserved for its Header which means that first logical page of database is the third physical page. To calculate Logical page number of EDB file, the formula is: However, the checksum value of database is equally important to its page numbers. When a transaction is being written to the disk, a mathematical calculation for the page is done which is called Checksum. This value is hel