Documentation for JIRA 4.3. Documentation for other versions of JIRA is available too. 
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A user reports of getting this error caused by a MySQL Bug:
com.atlassian.jira.exception.DataAccessException: java.sql.SQLException: Can't create/write to file 'C:\temp2#sql_eb4_0.MYI' (Errcode: 17) at com.atlassian.jira.upgrade.util.UpgradeUtils.getExactColumnName(UpgradeUtils.java:222) at com.atlassian.jira.appconsistency.db.Build178SchemaCheck.isColumnInTable(Build178SchemaCheck.java:81) at com.atlassian.jira.appconsistency.db.Build178SchemaCheck.check(Build178SchemaCheck.java:71) at com.atlassian.jira.appconsistency.db.Build178SchemaCheck.isOk(Build178SchemaCheck.java:38) at com.atlassian.jira.appconsistency.db.DatabaseChecker.checkDatabase(DatabaseChecker.java:108) at com.atlassian.jira.appconsistency.db.DatabaseCompatibilityEnforcer.contextInitialized(DatabaseCompatibilityEnforcer.java:32) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3692)
where the error code means:
C:\>perror 17 OS error code 17: File exists
The Workaround:
Disabling their virus checker seemed to resolve the issue of JIRA not coming up. Users should therefore not run "on-access" checking on their JIRA servers.
Bug Details:
The bug is described in more detail on the following link MySQL Bug Forum.