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Overview
Comment:Fix a typo on the wal.html page.
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SHA1: e97f04535496696553bdbc2d3a11f30d69225e20
User & Date: drh 2016-05-26 17:57:06
Context
2016-06-01
11:18
Fix typo in the description of the blessing. check-in: 8ff18d7976 user: drh tags: trunk
2016-05-26
17:57
Fix a typo on the wal.html page. check-in: e97f045354 user: drh tags: trunk
2016-05-23
18:10
Fix typo. check-in: a88d4c2239 user: mistachkin tags: trunk
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Changes to pages/wal.in.

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readers, writers and readers can run at the same time.  However,
since there is only one WAL file, there can only be one writer at
a time.</p>

<p>A checkpoint operation takes content from the WAL file
and transfers it back into the original database file.
A checkpoint can run concurrently with readers, however the checkpoint
must stop when it reaches a page in the WAL that is past the read mark
of any current reader.  The checkpoint has to stop at that point because
otherwise it might overwrite part of the database file that the reader
is actively using.  The checkpoint remembers (in the wal-index) how far
it got and will resume transferring content from the WAL to the database
from where it left off on the next invocation.</p>

<p>Thus a long-running read transaction can prevent a checkpointer from







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141
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readers, writers and readers can run at the same time.  However,
since there is only one WAL file, there can only be one writer at
a time.</p>

<p>A checkpoint operation takes content from the WAL file
and transfers it back into the original database file.
A checkpoint can run concurrently with readers, however the checkpoint
must stop when it reaches a page in the WAL that is past the end mark
of any current reader.  The checkpoint has to stop at that point because
otherwise it might overwrite part of the database file that the reader
is actively using.  The checkpoint remembers (in the wal-index) how far
it got and will resume transferring content from the WAL to the database
from where it left off on the next invocation.</p>

<p>Thus a long-running read transaction can prevent a checkpointer from