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doc: Use <literal> and all-caps for READ COMMITTED isolation level.
The documentation overall is not entirely consistent about how we do this, but this is consistent with other usages within lock.sgml. Etsuro Fujita
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doc/src/sgml/ref/lock.sgml

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@@ -51,9 +51,9 @@ LOCK [ TABLE ] [ ONLY ] <replaceable class="PARAMETER">name</replaceable> [ * ]
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restrictive lock mode possible. <command>LOCK TABLE</command>
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provides for cases when you might need more restrictive locking.
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For example, suppose an application runs a transaction at the
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Read Committed isolation level and needs to ensure that data in a
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table remains stable for the duration of the transaction. To
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achieve this you could obtain <literal>SHARE</> lock mode over the
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<literal>READ COMMITTED</> isolation level and needs to ensure that
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data in a table remains stable for the duration of the transaction.
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To achieve this you could obtain <literal>SHARE</> lock mode over the
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table before querying. This will prevent concurrent data changes
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and ensure subsequent reads of the table see a stable view of
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committed data, because <literal>SHARE</> lock mode conflicts with

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