TABLE OF CONTENTS Three types of errors can occur in an Exchange database:
Application (Exchange or ESE) level
JET (database) level
Physical or page level
Table 7.7 describes the most common errors. See Microsoft Knowledge Base article 314917 for more information.
| Error | Meaning | Indication |
|---|---|---|
| 1018 (JET_errReadVerifyFailure) | The checksum read from disk is not the same as the checksum that was originally written, or the page number does not match the page number that is expected. | Page-level corruption may have occurred. |
| ?1019 (JET_errPageNotInitialized) | A page that is expected to be in use is not initialized or empty. | The page may be corrupt. |
| 1022 (JET_errDiskIO) | A generic error indicating that the requested page cannot be read by ESE. | A physical disk error is probable. |
A -1018 error occurs when the ESE engine makes a request to Windows to fetch a particular page from the database and ESE then returns unexpected data, normally a different page number or checksum. ESE flags the error to prevent further access to the page and to let administrators know that action is required. Continuing to attempt to access a damaged page (or damaged section of a database) usually results in even more data loss than may occur if you immediately notice a problem and take appropriate action. For example, if you take a backup of a flawed database, you will not be able to restore it.
Many different underlying problems can cause a wrong page to be...
