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I used the config script on the web to upgrade the MediaWiki from 1.15.3 to 1.16.0. The following errors were reported by the config script:

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Setting the search path for user "wiki" ...OK
Connected to postgres 8.1.19
There are already MediaWiki tables in this database. Checking if updates are needed.
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... search_path for user "wiki" looks correct (mediawiki, public)
... default value of "client_min_messages" is correctly set to "error" for user "wiki"
... default value of "DateStyle" is correctly set to "ISO, YMD" for user "wiki"
... default value of "TimeZone" is correctly set to "GMT" for user "wiki"
Updating sequence names


Warning: pg_query() [function.pg-query]: Query failed: ERROR: syntax error at or near "RENAME" at character 65 in /var/www/html/includes/db/DatabasePostgres.php on line 584

Updating sequence names


Warning: pg_query() [function.pg-query]: Query failed: ERROR: syntax error at or near "RENAME" at character 65 in /var/www/html/includes/db/DatabasePostgres.php on line 584

... table "category" already exists
... table "mediawiki_version" already exists
... table "mwuser" already exists.
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----------------------------------------------------------------------------

The 'sequence update' part failed. I traced the source of the above error to mediawiki-1.16.0/maintenance/postgres/archives/patch-update_sequences.sql. The 'ALTER SEQUENCE' is invalid syntax and I replaced these statements with 'ALTER TABLE' as per postgres documentation. I reloaded the database from 1.15.3 and tried to upgrade again and upgrade went without a hitch. I can see the renamed sequences in mediawiki schema.


However, when I try to update any page I get the following error:

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MediaWiki internal error.

Original exception: exception 'DBUnexpectedError' with message 'A database error has occurred
Query: SELECT nextval('text_old_id_seq')
Function:
Error: 1 ERROR: relation "text_old_id_seq" does not exist
' in /var/www/html/includes/db/DatabasePostgres.php:1122
Stack trace:
#0 /var/www/html/includes/db/Database.php(538): DatabasePostgres->reportQueryError('ERROR: relatio...', 1, 'SELECT nextval(...', '', false)
#1 /var/www/html/includes/db/DatabasePostgres.php(972): DatabaseBase->query('SELECT nextval(...')
#2 /var/www/html/includes/Revision.php(827): DatabasePostgres->nextSequenceValue('text_old_id_seq')
#3 /var/www/html/includes/Article.php(1960): Revision->insertOn(Object(DatabasePostgres))
#4 /var/www/html/includes/Article.php(1791): Article->doEdit('{{DR Documentat...', '', 98)
#5 /var/www/html/includes/EditPage.php(1047): Article->updateArticle('{{DR Documentat...', '', false, false, false, '')
#6 /var/www/html/includes/EditPage.php(2552): EditPage->internalAttemptSave(false, false)
#7 /var/www/html/includes/EditPage.php(389): EditPage->attemptSave()
#8 /var/www/html/includes/EditPage.php(271): EditPage->edit()
#9 /opt/wiki/extensions/FCKeditor/FCKeditor.body.php(218): EditPage->submit()
#10 [internal function]: FCKeditor_MediaWiki->onCustomEditor(Object(Article), Object(User))
#11 /var/www/html/includes/Hooks.php(133): call_user_func_array(Array, Array)
#12 /var/www/html/includes/Wiki.php(545): wfRunHooks('CustomEditor', Array)
#13 /var/www/html/includes/Wiki.php(70): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#14 /var/www/html/index.php(117): MediaWiki->performRequestForTitle(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#15 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'SQL error: ERROR: current transaction is aborted, commands ignored until end of transaction block' in /var/www/html/includes/db/DatabasePostgres.php:635
Stack trace:
#0 /var/www/html/includes/WatchedItem.php(45): DatabasePostgres->numRows(false)
#1 /var/www/html/includes/User.php(2291): WatchedItem->isWatched()
#2 /var/www/html/includes/Title.php(1011): User->isWatched(Object(Title))
#3 /var/www/html/includes/SkinTemplate.php(847): Title->userIsWatching()
#4 /var/www/html/includes/SkinTemplate.php(490): SkinTemplate->buildContentActionUrls()
#5 /var/www/html/includes/OutputPage.php(1572): SkinTemplate->outputPage(Object(OutputPage))
#6 /var/www/html/includes/Exception.php(164): OutputPage->output()
#7 /var/www/html/includes/Exception.php(191): MWException->reportHTML()
#8 /var/www/html/includes/Exception.php(289): MWException->report()
#9 /var/www/html/includes/Exception.php(348): wfReportException(Object(DBUnexpectedError))
#10 [internal function]: wfExceptionHandler(Object(DBUnexpectedError))
#11 {main}
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Do I need to upadte cache or something? The above error happens when I try to save a page after updating. Thanks in advance.