diff options
Diffstat (limited to 'doc/src/sgml')
| -rw-r--r-- | doc/src/sgml/wal.sgml | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml index 0420610a011..6172a087f2f 100644 --- a/doc/src/sgml/wal.sgml +++ b/doc/src/sgml/wal.sgml @@ -578,12 +578,12 @@ <para> There are two commonly used internal <acronym>WAL</acronym> functions: - <function>XLogInsert</function> and <function>XLogFlush</function>. - <function>XLogInsert</function> is used to place a new record into + <function>XLogInsertRecord</function> and <function>XLogFlush</function>. + <function>XLogInsertRecord</function> is used to place a new record into the <acronym>WAL</acronym> buffers in shared memory. If there is no - space for the new record, <function>XLogInsert</function> will have + space for the new record, <function>XLogInsertRecord</function> will have to write (move to kernel cache) a few filled <acronym>WAL</acronym> - buffers. This is undesirable because <function>XLogInsert</function> + buffers. This is undesirable because <function>XLogInsertRecord</function> is used on every database low level modification (for example, row insertion) at a time when an exclusive lock is held on affected data pages, so the operation needs to be as fast as possible. What @@ -594,7 +594,7 @@ made, for the most part, at transaction commit time to ensure that transaction records are flushed to permanent storage. On systems with high log output, <function>XLogFlush</function> requests might - not occur often enough to prevent <function>XLogInsert</function> + not occur often enough to prevent <function>XLogInsertRecord</function> from having to do writes. On such systems one should increase the number of <acronym>WAL</acronym> buffers by modifying the <xref linkend="guc-wal-buffers"> parameter. When @@ -683,7 +683,7 @@ Enabling the <xref linkend="guc-wal-debug"> configuration parameter (provided that <productname>PostgreSQL</productname> has been compiled with support for it) will result in each - <function>XLogInsert</function> and <function>XLogFlush</function> + <function>XLogInsertRecord</function> and <function>XLogFlush</function> <acronym>WAL</acronym> call being logged to the server log. This option might be replaced by a more general mechanism in the future. </para> @@ -708,7 +708,7 @@ building the server). Each segment is divided into pages, normally 8 kB each (this size can be changed via the <option>--with-wal-blocksize</> configure option). The log record headers are described in - <filename>access/xlog.h</filename>; the record content is dependent + <filename>access/xlogrecord.h</filename>; the record content is dependent on the type of event that is being logged. Segment files are given ever-increasing numbers as names, starting at <filename>000000010000000000000000</filename>. The numbers do not wrap, |