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The row-version chaining in Serializable Snapshot Isolation was still wrong.

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On further analysis, it turns out that it is not needed to duplicate predicate
locks to the new row version at update, the lock on the version that the
transaction saw as visible is enough. However, there was a different bug in
the code that checks for dangerous structures when a new rw-conflict happens.
Fix that bug, and remove all the row-version chaining related code.

Kevin Grittner & Dan Ports, with some comment editorialization by me.
This commit is contained in:
Heikki Linnakangas
2011-05-30 20:42:16 +03:00
parent 5177dfefc5
commit 3103f9a77d
7 changed files with 161 additions and 161 deletions
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5
src/test/isolation/specs/multiple-row-versions.spec
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@@ -1,8 +1,7 @@
# Multiple Row Versions test
#
# This test is designed to ensure that predicate locks taken on one version
# of a row are detected as conflicts when a later version of the row is
# updated or deleted by a transaction concurrent to the reader.
# This test is designed to cover some code paths which only occur with
# four or more transactions interacting with particular timings.
#
# Due to long permutation setup time, we are only testing one specific
# permutation, which should get a serialization error.