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postgresql9.4-docs-9.4.12-1.1.mga6.noarch.rpm

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>Appendix E. Release Notes</TD
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><H1
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><A
NAME="RELEASE-9-2-20"
>E.33. Release 9.2.20</A
></H1
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Release Date: </B
>2017-02-09</P
></BLOCKQUOTE
></DIV
><P
>   This release contains a variety of fixes from 9.2.19.
   For information about new features in the 9.2 major release, see
   <A
HREF="release-9-2.html"
>Section E.53</A
>.
  </P
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN126715"
>E.33.1. Migration to Version 9.2.20</A
></H2
><P
>    A dump/restore is not required for those running 9.2.X.
   </P
><P
>    However, if your installation has been affected by the bug described in
    the first changelog entry below, then after updating you may need
    to take action to repair corrupted indexes.
   </P
><P
>    Also, if you are upgrading from a version earlier than 9.2.11,
    see <A
HREF="release-9-2-11.html"
>Section E.42</A
>.
   </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN126721"
>E.33.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
>      Fix a race condition that could cause indexes built
      with <TT
CLASS="COMMAND"
>CREATE INDEX CONCURRENTLY</TT
> to be corrupt
      (Pavan Deolasee, Tom Lane)
     </P
><P
>      If <TT
CLASS="COMMAND"
>CREATE INDEX CONCURRENTLY</TT
> was used to build an index
      that depends on a column not previously indexed, then rows
      updated by transactions that ran concurrently with
      the <TT
CLASS="COMMAND"
>CREATE INDEX</TT
> command could have received incorrect
      index entries.  If you suspect this may have happened, the most
      reliable solution is to rebuild affected indexes after installing
      this update.
     </P
></LI
><LI
><P
>      Unconditionally WAL-log creation of the <SPAN
CLASS="QUOTE"
>"init fork"</SPAN
> for an
      unlogged table (Michael Paquier)
     </P
><P
>      Previously, this was skipped when <A
HREF="runtime-config-wal.html#GUC-WAL-LEVEL"
>wal_level</A
>
      = <TT
CLASS="LITERAL"
>minimal</TT
>, but actually it's necessary even in that case
      to ensure that the unlogged table is properly reset to empty after a
      crash.
     </P
></LI
><LI
><P
>      Fix WAL page header validation when re-reading segments (Takayuki
      Tsunakawa, Amit Kapila)
     </P
><P
>      In corner cases, a spurious <SPAN
CLASS="QUOTE"
>"out-of-sequence TLI"</SPAN
> error
      could be reported during recovery.
     </P
></LI
><LI
><P
>      If the stats collector dies during hot standby, restart it (Takayuki
      Tsunakawa)
     </P
></LI
><LI
><P
>      Check for interrupts while hot standby is waiting for a conflicting
      query (Simon Riggs)
     </P
></LI
><LI
><P
>      Avoid constantly respawning the autovacuum launcher in a corner case
      (Amit Khandekar)
     </P
><P
>      This fix avoids problems when autovacuum is nominally off and there
      are some tables that require freezing, but all such tables are
      already being processed by autovacuum workers.
     </P
></LI
><LI
><P
>      Fix check for when an extension member object can be dropped (Tom Lane)
     </P
><P
>      Extension upgrade scripts should be able to drop member objects,
      but this was disallowed for serial-column sequences, and possibly
      other cases.
     </P
></LI
><LI
><P
>      Make sure <TT
CLASS="COMMAND"
>ALTER TABLE</TT
> preserves index tablespace
      assignments when rebuilding indexes (Tom Lane, Michael Paquier)
     </P
><P
>      Previously, non-default settings
      of <A
HREF="runtime-config-client.html#GUC-DEFAULT-TABLESPACE"
>default_tablespace</A
> could result in broken
      indexes.
     </P
></LI
><LI
><P
>      Prevent dropping a foreign-key constraint if there are pending
      trigger events for the referenced relation (Tom Lane)
     </P
><P
>      This avoids <SPAN
CLASS="QUOTE"
>"could not find trigger <TT
CLASS="REPLACEABLE"
><I
>NNN</I
></TT
>"</SPAN
>
      or <SPAN
CLASS="QUOTE"
>"relation <TT
CLASS="REPLACEABLE"
><I
>NNN</I
></TT
> has no triggers"</SPAN
> errors.
     </P
></LI
><LI
><P
>      Fix processing of OID column when a table with OIDs is associated to
      a parent with OIDs via <TT
CLASS="COMMAND"
>ALTER TABLE ... INHERIT</TT
> (Amit
      Langote)
     </P
><P
>      The OID column should be treated the same as regular user columns in
      this case, but it wasn't, leading to odd behavior in later
      inheritance changes.
     </P
></LI
><LI
><P
>      Check for serializability conflicts before reporting
      constraint-violation failures (Thomas Munro)
     </P
><P
>      When using serializable transaction isolation, it is desirable
      that any error due to concurrent transactions should manifest
      as a serialization failure, thereby cueing the application that
      a retry might succeed.  Unfortunately, this does not reliably
      happen for duplicate-key failures caused by concurrent insertions.
      This change ensures that such an error will be reported as a
      serialization error if the application explicitly checked for
      the presence of a conflicting key (and did not find it) earlier
      in the transaction.
     </P
></LI
><LI
><P
>      Ensure that column typmods are determined accurately for
      multi-row <TT
CLASS="LITERAL"
>VALUES</TT
> constructs (Tom Lane)
     </P
><P
>      This fixes problems occurring when the first value in a column has a
      determinable typmod (e.g., length for a <TT
CLASS="TYPE"
>varchar</TT
> value) but
      later values don't share the same limit.
     </P
></LI
><LI
><P
>      Throw error for an unfinished Unicode surrogate pair at the end of a
      Unicode string (Tom Lane)
     </P
><P
>      Normally, a Unicode surrogate leading character must be followed by a
      Unicode surrogate trailing character, but the check for this was
      missed if the leading character was the last character in a Unicode
      string literal (<TT
CLASS="LITERAL"
>U&amp;'...'</TT
>) or Unicode identifier
      (<TT
CLASS="LITERAL"
>U&amp;"..."</TT
>).
     </P
></LI
><LI
><P
>      Ensure that a purely negative text search query, such
      as <TT
CLASS="LITERAL"
>!foo</TT
>, matches empty <TT
CLASS="TYPE"
>tsvector</TT
>s (Tom Dunstan)
     </P
><P
>      Such matches were found by GIN index searches, but not by sequential
      scans or GiST index searches.
     </P
></LI
><LI
><P
>      Prevent crash when <CODE
CLASS="FUNCTION"
>ts_rewrite()</CODE
> replaces a non-top-level
      subtree with an empty query (Artur Zakirov)
     </P
></LI
><LI
><P
>      Fix performance problems in <CODE
CLASS="FUNCTION"
>ts_rewrite()</CODE
> (Tom Lane)
     </P
></LI
><LI
><P
>      Fix <CODE
CLASS="FUNCTION"
>ts_rewrite()</CODE
>'s handling of nested NOT operators
      (Tom Lane)
     </P
></LI
><LI
><P
>      Fix <CODE
CLASS="FUNCTION"
>array_fill()</CODE
> to handle empty arrays properly (Tom Lane)
     </P
></LI
><LI
><P
>      Fix one-byte buffer overrun in <CODE
CLASS="FUNCTION"
>quote_literal_cstr()</CODE
>
      (Heikki Linnakangas)
     </P
><P
>      The overrun occurred only if the input consisted entirely of single
      quotes and/or backslashes.
     </P
></LI
><LI
><P
>      Prevent multiple calls of <CODE
CLASS="FUNCTION"
>pg_start_backup()</CODE
>
      and <CODE
CLASS="FUNCTION"
>pg_stop_backup()</CODE
> from running concurrently (Michael
      Paquier)
     </P
><P
>      This avoids an assertion failure, and possibly worse things, if
      someone tries to run these functions in parallel.
     </P
></LI
><LI
><P
>      Avoid discarding <TT
CLASS="TYPE"
>interval</TT
>-to-<TT
CLASS="TYPE"
>interval</TT
> casts
      that aren't really no-ops (Tom Lane)
     </P
><P
>      In some cases, a cast that should result in zeroing out
      low-order <TT
CLASS="TYPE"
>interval</TT
> fields was mistakenly deemed to be a
      no-op and discarded.  An example is that casting from <TT
CLASS="TYPE"
>INTERVAL
      MONTH</TT
> to <TT
CLASS="TYPE"
>INTERVAL YEAR</TT
> failed to clear the months field.
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> to dump user-defined casts and transforms
      that use built-in functions (Stephen Frost)
     </P
></LI
><LI
><P
>      Fix possible <SPAN
CLASS="APPLICATION"
>pg_basebackup</SPAN
> failure on standby
      server when including WAL files (Amit Kapila, Robert Haas)
     </P
></LI
><LI
><P
>      Ensure that the Python exception objects we create for PL/Python are
      properly reference-counted (Rafa de la Torre, Tom Lane)
     </P
><P
>      This avoids failures if the objects are used after a Python garbage
      collection cycle has occurred.
     </P
></LI
><LI
><P
>      Fix PL/Tcl to support triggers on tables that have <TT
CLASS="LITERAL"
>.tupno</TT
>
      as a column name (Tom Lane)
     </P
><P
>      This matches the (previously undocumented) behavior of
      PL/Tcl's <TT
CLASS="COMMAND"
>spi_exec</TT
> and <TT
CLASS="COMMAND"
>spi_execp</TT
> commands,
      namely that a magic <TT
CLASS="LITERAL"
>.tupno</TT
> column is inserted only if
      there isn't a real column named that.
     </P
></LI
><LI
><P
>      Allow DOS-style line endings in <TT
CLASS="FILENAME"
>~/.pgpass</TT
> files,
      even on Unix (Vik Fearing)
     </P
><P
>      This change simplifies use of the same password file across Unix and
      Windows machines.
     </P
></LI
><LI
><P
>      Fix one-byte buffer overrun if <SPAN
CLASS="APPLICATION"
>ecpg</SPAN
> is given a file
      name that ends with a dot (Takayuki Tsunakawa)
     </P
></LI
><LI
><P
>      Fix <SPAN
CLASS="APPLICATION"
>psql</SPAN
>'s tab completion for <TT
CLASS="COMMAND"
>ALTER DEFAULT
      PRIVILEGES</TT
> (Gilles Darold, Stephen Frost)
     </P
></LI
><LI
><P
>      In <SPAN
CLASS="APPLICATION"
>psql</SPAN
>, treat an empty or all-blank setting of
      the <TT
CLASS="ENVAR"
>PAGER</TT
> environment variable as meaning <SPAN
CLASS="QUOTE"
>"no
      pager"</SPAN
> (Tom Lane)
     </P
><P
>      Previously, such a setting caused output intended for the pager to
      vanish entirely.
     </P
></LI
><LI
><P
>      Improve <TT
CLASS="FILENAME"
>contrib/dblink</TT
>'s reporting of
      low-level <SPAN
CLASS="APPLICATION"
>libpq</SPAN
> errors, such as out-of-memory
      (Joe Conway)
     </P
></LI
><LI
><P
>      On Windows, ensure that environment variable changes are propagated
      to DLLs built with debug options (Christian Ullrich)
     </P
></LI
><LI
><P
>      Sync our copy of the timezone library with IANA release tzcode2016j
      (Tom Lane)
     </P
><P
>      This fixes various issues, most notably that timezone data
      installation failed if the target directory didn't support hard
      links.
     </P
></LI
><LI
><P
>      Update time zone data files to <SPAN
CLASS="APPLICATION"
>tzdata</SPAN
> release 2016j
      for DST law changes in northern Cyprus (adding a new zone
      Asia/Famagusta), Russia (adding a new zone Europe/Saratov), Tonga,
      and Antarctica/Casey.
      Historical corrections for Italy, Kazakhstan, Malta, and Palestine.
      Switch to preferring numeric zone abbreviations for Tonga.
     </P
></LI
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