One way to reduce the need for VACUUM is to use HOT updates. If the standby should replay such a lock on a table that a query uses, we have a lock conflict. PostgreSQL takes such a lock for operations that conflict with SELECT, for example DROP TABLE, TRUNCATE and many ALTER TABLE statements. So any ACCESS EXCLUSIVE lock on the primary (which conflicts with ACCESS SHARE) must be replayed on the standby to keep incompatible operations on the table from happening. The queries on a standby server take an ACCESS SHARE lock on the tables they are reading. Now a query on the standby may have started before VACUUM on the primary (it has an older snapshot), so it can still see the tuples that should be removed. Snapshot conflicts can occur if VACUUM processes a table and removes dead tuples. This is the most frequent replication conflict. There are several kinds of replication conflicts: Snapshot replication conflicts These conflicts cannot happen with queries on the primary server, but they happen on the streaming replication standby server because the primary server has limited knowledge about what is going on on the standby. What is a replication conflict?Ī replication conflict occurs whenever the recovery process cannot apply WAL information from the primary server to the standby, because the change would disrupt query processing there. This article describes replication conflicts and tells you how to deal with them. So many people are surprised when they learn about replication conflicts - after all, the standby server is read-only. It is simple to set up, stable and performs well. Streaming replication in PostgreSQL is a well-established master-slave replication technique. It should not save and will revert when ordering is finished.Administration backup backup and recovery replication attempt to reorder the issue's table of contents, by moving this new section to the top.Ĩ. Publish a third article in a new section, and add it to the issue.ħ. Edit the issue and re-order the two sections. Publish a second article in a different section and add it to the same issue.ĥ. Publish an article in one of those sections and add it to the issue.Ĥ. Ensure that you have at least three journal sections created.ģ. There's no other entry point to insert the records needed for ordering in custom_section_orders after that first go around, and future calls to `resequenceCustomSectionOrders` will not find the newly added sections to the issue's table of contents.Ģ. I believe this is because `setDefaultCustomSectionOrders` is only called initially, in `setDataElementSequence` in `TocGridHandler` if the `sectionDao` does not detect an existing custom order. The grid will remember the order for the first time you customize ordering, but not for anything you add to that issue later on. It's possible to move them around in the TOC grid, but when you click save they will revert partially. If an issue is created, and articles in various sections … are added to this issue, and then the issue is ordered in a custom way so that sections are moved around, new sections added later on can't be ordered. PHP Fatal error: Uncaught PDOException: SQLSTATE: Invalid column reference: 7 ERROR: there is no unique or exclusion constraint matching the ON CONFLICT specification in /usr/local/hnetojs/lib/pkp/lib/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:115 #4 /usr/local/hnetojs/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Data in /usr/local/hnetojs/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php on line 671 #3 /usr/local/hnetojs/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php(631): Illuminate\Database\Connection->runQuer圜allback('insert into "cu.', Array, Object(Closure)) usr/local/www/data/eprints/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Database/Connection.php(489): Doctrine\DBAL\Driver\PDOStatement->execute()\n#2 Trace:\n#0 /usr/local/www/data/eprints/lib/pkp/lib/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php(115): PDOStatement->execute(NULL)\n#1 There is no unique or exclusion constraint matching the ON CONFLICT specification in /usr/local/www/data/eprints/lib/pkp/lib/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:115\nStack As it is a biannual journal, after some time without publishing, we gather the articles for a new volume, I click publish and the errors listed below appear.Ī new volume is published, but without the authors and articles.
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