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<H2>1 Mnesia Release Notes</H2>
<P> This document describes the changes made to the Mnesia system
from version to version. The intention of this document is to
list all incompatibilities as well as all enhancements and
bugfixes for every release of Mnesia. Each release of Mnesia
thus constitutes one section in this document. The title of each
section is the version number of Mnesia.
<A NAME="1.1"><!-- Empty --></A>
<H3>1.1 Mnesia 4.2.5</H3>
<A NAME="1.1.1"><!-- Empty --></A>
<H4>1.1.1 Fixed Bugs and Malfunctions</H4>
<P>
<UL>
<LI>
Jump starting a disc based node didn't work as expected.
<BR>
Own Id: OTP-5892
<BR>
</LI>
</UL>
<A NAME="1.2"><!-- Empty --></A>
<H3>1.2 Mnesia 4.2.4</H3>
<A NAME="1.2.1"><!-- Empty --></A>
<H4>1.2.1 Improvements and New Features</H4>
<P>
<UL>
<LI>
A disc based Mnesia node can now be jump started with an
empty directory by connecting it (via extra_db_nodes) to
another node with a copy of all data.
<BR>
Own Id: OTP-5884
<BR>
</LI>
</UL>
<A NAME="1.3"><!-- Empty --></A>
<H3>1.3 Mnesia 4.2.3</H3>
<A NAME="1.3.1"><!-- Empty --></A>
<H4>1.3.1 Fixed Bugs and Malfunctions</H4>
<P>
<UL>
<LI>
Dumping log files (during start),containing a add_index
operation on disc_only_copies tables failed, which caused
that the remaining operations in the log file was never
executed.
<BR>
Own Id: OTP-5638
<BR>
</LI>
</UL>
<A NAME="1.4"><!-- Empty --></A>
<H3>1.4 Mnesia 4.2.2</H3>
<A NAME="1.4.1"><!-- Empty --></A>
<H4>1.4.1 Fixed Bugs and Malfunctions</H4>
<P>
<UL>
<LI>
<CODE>pid_sort_order</CODE> could cause a deadlock in locker.
<BR>
Own Id: OTP-5438
<BR>
</LI>
<LI>
<CODE>Mnesia</CODE> could return from
<CODE>mnesia:wait_for_tables/2</CODE> to early.
<BR>
Own Id: OTP-5473
<BR>
</LI>
<LI>
<CODE>Mnesia</CODE> can now handle mixing and nesting dirty
(and ets) activities inside transactions. Calling
<CODE>mnesia:[a]sync_dirty/[1|2]</CODE> inside a transaction no
longer get evaluated in dirty context, because the
results could previously be different depending on how
the mixed nesting was done, and only one nesting level
could be handled.
<BR>
*** POTENTIAL INCOMPATIBILITY ***
<BR>
Own Id: OTP-5474
<BR>
</LI>
<LI>
Safer startup of mnesia, deleting tables when mnesia
started could cause problems.
<BR>
Own Id: OTP-5483
<BR>
</LI>
<LI>
Mnesia <CODE>fold[l|r]/3</CODE> couldn't handle calling
transaction inside the fun sent to fold (note: it's NOT a
good idea to do it).
<BR>
Own Id: OTP-5495
<BR>
</LI>
</UL>
<A NAME="1.4.2"><!-- Empty --></A>
<H4>1.4.2 Improvements and New Features</H4>
<P>
<UL>
<LI>
<CODE>mnesia:dirty_update_counter/[2|3]</CODE> set the value to
0 if key did not exist, now it sets the value to the
increment value if it is larger than 0.
<BR>
*** POTENTIAL INCOMPATIBILITY ***
<BR>
Own Id: OTP-5475
<BR>
</LI>
</UL>
<A NAME="1.5"><!-- Empty --></A>
<H3>1.5 Mnesia 4.2.1</H3>
<A NAME="1.5.1"><!-- Empty --></A>
<H4>1.5.1 Fixed Bugs and Malfunctions</H4>
<P>
<UL>
<LI>
Reading bad backup files failed completly, now it just
ignores the bad parts.
<BR>
Own Id: OTP-5289 Aux Id: seq9650
<BR>
</LI>
<LI>
Disk tables could be loaded in wrong order at startup,
changes made when a node was down could be missed.
<BR>
Own Id: OTP-5300 Aux Id: seq9688
<BR>
</LI>
<LI>
A call to mnesia:add_table_copy could hang if the node
which the table was copied from crashed.
<BR>
Own Id: OTP-5328
<BR>
</LI>
<LI>
Mnesia could crash during the start phase if a mnesia
table was deleted by another node.
<BR>
Own Id: OTP-5358 Aux Id: seq9705 EABln20139
<BR>
</LI>
</UL>
<A NAME="1.5.2"><!-- Empty --></A>
<H4>1.5.2 Improvements and New Features</H4>
<P>
<UL>
<LI>
Introduced a new env parameter <CODE>pid_sort_order</CODE>
which should be set to <CODE>r9b_plain</CODE> on non unpatched
R9B systems to be able to use mnesia on mixed systems
with unpatched R9B nodes. This is a workaround for a
specific upgrade problem when mixing certain emulators
versions so it should not be used unless needed.
<BR>
Own Id: OTP-5347 Aux Id: Seq9712
<BR>
</LI>
</UL>
<A NAME="1.6"><!-- Empty --></A>
<H3>1.6 Mnesia 4.2</H3>
<A NAME="1.6.1"><!-- Empty --></A>
<H4>1.6.1 Improvements and new features</H4>
<P>
<UL>
<LI>
New functions mnesia:select/4, mnesia:select/1 and mnesia:table/[1|2] are implemented.
The new <CODE>mnesia:select</CODE> functions returns a limited number of results
from each invocation. The <CODE>mnesia:table</CODE> functions makes
it possible for QLC to operate on mnesia tables.
<BR>
</LI>
</UL>
<A NAME="1.6.2"><!-- Empty --></A>
<H4>1.6.2 Fixed Bugs and malfunctions</H4>
<P> None
<A NAME="1.6.3"><!-- Empty --></A>
<H4>1.6.3 Incompatibilities</H4>
<P> None <A NAME="1.6.4"><!-- Empty --></A>
<H4>1.6.4 Known bugs and problems</H4>
<P>None.
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