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Doc: document the current-transaction-modes GUCs.

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We had documentation of default_transaction_isolation et al,
but for some reason not of transaction_isolation et al.
AFAICS this is just an ancient oversight, so repair.

Per bug #17077 from Yanliang Lei.

Discussion: https://postgr.es/m/17077-ade8e166a01e1374@postgresql.org
This commit is contained in:
Tom Lane
2021-07-17 11:52:54 -04:00
parent f0e21f2f61
commit 665c5855e5
2 changed files with 76 additions and 3 deletions
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13
doc/src/sgml/ref/set_transaction.sgml
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@@ -202,7 +202,7 @@ SET SESSION CHARACTERISTICS AS TRANSACTION <replaceable class="parameter">transa
</para>
<para>
The session default transaction modes can also be set by setting the
The session default transaction modes can also be set or examined via the
configuration parameters <xref linkend="guc-default-transaction-isolation"/>,
<xref linkend="guc-default-transaction-read-only"/>, and
<xref linkend="guc-default-transaction-deferrable"/>.
@@ -212,6 +212,17 @@ SET SESSION CHARACTERISTICS AS TRANSACTION <replaceable class="parameter">transa
<command>ALTER DATABASE</command>, etc. Consult <xref linkend="runtime-config"/>
for more information.
</para>
<para>
The current transaction's modes can similarly be set or examined via the
configuration parameters <xref linkend="guc-transaction-isolation"/>,
<xref linkend="guc-transaction-read-only"/>, and
<xref linkend="guc-transaction-deferrable"/>. Setting one of these
parameters acts the same as the corresponding <command>SET
TRANSACTION</command> option, with the same restrictions on when it can
be done. However, these parameters cannot be set in the configuration
file, or from any source other than live SQL.
</para>
</refsect1>
<refsect1>