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Displaying posts with tag: READ COMMITTED (reset)

Runaway history list
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On one of the clusters at Spil we noticed a sudden increase in the length of the history list and a steep increase in the ibdata file in the MySQL directory.
I did post a bit about this topic earlier regarding MySQL 5.5 but this cluster is still running 5.1 and unfortunately 5.1 does not have the same configurable options to influence the purging of the undo log…

Now I did find a couple of great resources that explain the purge lag problem into detail: Pythian,


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Storage Engine API state graph
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Drizzle still has a number of quirks inherited from the MySQL Storage Engine API (e.g. BLOBs, row buffer, CREATE SELECT and lack of DDL transaction boundaries, key tuple format). One of the things we fixed a long time ago was to have proper methods for StorageEngines to be called for: startTransaction, startStatement, endStatement, commit and rollback.

If you’ve had to implement a transactional storage engine in MySQL you will be well aware of the pattern

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