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diff --git a/doc/src/sgml/release-xl-9.5.sgml b/doc/src/sgml/release-xl-9.5.sgml index da7d75e3cd..b9a8cc70d6 100644 --- a/doc/src/sgml/release-xl-9.5.sgml +++ b/doc/src/sgml/release-xl-9.5.sgml @@ -719,4 +719,128 @@ or removed from distribution or when distribution key is changed. </listitem> </itemizedlist> </sect2> + <sect2> + <title>Known Limitation</title> + <para> + While <productname>Postgres-XL</productname> strives hard to stay compatible +with <productname>PostgreSQL</productname> so that applications running on +<productname>PostgreSQL</productname> can be easily ported to +<productname>Postgres-XL</productname>, there are certain known limitations of +the product. Many of these can be addressed as and when sufficient development +funding and resources become available. + <itemizedlist> + <listitem> + <para> + Hot Standby is not supported + </para> + </listitem> + <listitem> + <para> + Distributed deadlock detection is not supported yet. Deadlock detection exists + on each node, just not across nodes. + </para> + </listitem> + <listitem> + <para> + Materialised views are currently maintained only on the coordinator. + </para> + </listitem> + <listitem> + <para> + EXCLUSION CONSTRAINTS are enforced when both rows map to the same datanode. + </para> + </listitem> + <listitem> + <para> + User defined functions have several limitations. + </para> + </listitem> + <listitem> + <para> + There are restrictions on complex UPDATE/DELETE queries and updating +distribution column values. + </para> + </listitem> + <listitem> + <para> + TRIGGERs are not supported. + </para> + </listitem> + <listitem> + <para> + EVENT TRIGGERs are not supported. + </para> + </listitem> + <listitem> + <para> + SERIALIZABLE TRANSACTIONs are not supported. + </para> + </listitem> + <listitem> + <para> + CREATE INDEX CONCURRENTLY is not supported. + </para> + </listitem> + <listitem> + <para> + SAVEPOINTs are not supported. + </para> + </listitem> + <listitem> + <para> + Large objects are not supported. + </para> + </listitem> + <listitem> + <para> + Recursive queries work only in certain conditions. + </para> + </listitem> + <listitem> + <para> + GROUPING SETS, ROLLUP or CUBE are not yet supported. + </para> + </listitem> + <listitem> + <para> + Foreign Data Wrappers are not supported. + </para> + </listitem> + <listitem> + <para> + INSENSITIVE/SCROLL/WITH HOLD cursors are not supported. + </para> + </listitem> + <listitem> + <para> + LISTEN/NOTIFY is not supported. + </para> + </listitem> + </itemizedlist> + </para> + </sect2> + <sect2> + <title>Contributing to Postgres-XL</title> + <para> + Contributions to <productname>Postgres-XL</productname> are welcome. The +code will be accepted under the same open source license that governs this +released version of <productname>Postgres-XL</productname>. The authors of the +patches will be credited appropriately in the release notes of the future +releases. + </para> + </sect2> + <sect2> + <title>Credits</title> + <para> + <productname>Postgres-XL</productname> has been evolving over many years, +originating with the <productname>GridSQL</productname> +project and <productname>Postgres-XC</productname>, later combined as TransLattice Storm (StormDB). +TransLattice open sourced the project, resulting in Postgres-XL 9.2. More +recently, the EU-funded Big Data project AXLE funded the main work to bring the +code up to date as <productname>Postgres-XL</productname> 9.5, allowing +<productname>Postgres-XL</productname> to take advantage of the +rapidly increasing BI features plugged into the core of +<productname>PostgreSQL</productname>. + </para> + </sect2> </sect1> |