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initdb: Further polishing of --wal-segsize option
Extend documentation. Improve option parsing in case no argument was specified.
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@ -316,16 +316,22 @@ PostgreSQL documentation
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</varlistentry>
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<varlistentry>
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<term><option>--wal-segsize=<replaceable>SEGSIZE</replaceable></option></term>
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<term><option>--wal-segsize=<replaceable>size</replaceable></option></term>
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<listitem>
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<para>
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Set the <firstterm>WAL segment size</firstterm>, in megabytes. This is
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the size of each individual file in the WAL log. It may be useful
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to adjust this size to control the granularity of WAL log shipping.
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This option can only be set during initialization, and cannot be
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changed later.
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The default size is 16 megabytes.
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The value must be a power of 2 between 1 and 1024 (megabytes).
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Set the <firstterm>WAL segment size</firstterm>, in megabytes. This
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is the size of each individual file in the WAL log. The default size
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is 16 megabytes. The value must be a power of 2 between 1 and 1024
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(megabytes). This option can only be set during initialization, and
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cannot be changed later.
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</para>
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<para>
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It may be useful to adjust this size to control the granularity of
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WAL log shipping or archiving. Also, in databases with a high volume
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of WAL, the sheer number of WAL files per directory can become a
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performance and management problem. Increasing the WAL file size
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will reduce the number of WAL files.
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</para>
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</listitem>
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</varlistentry>
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@ -3224,7 +3224,7 @@ main(int argc, char *argv[])
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wal_segment_size_mb = strtol(str_wal_segment_size_mb, &endptr, 10);
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/* verify that wal segment size is valid */
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if (*endptr != '\0')
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if (endptr == str_wal_segment_size_mb || *endptr != '\0')
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{
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fprintf(stderr,
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_("%s: argument of --wal-segsize must be a number\n"),
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@ -3234,7 +3234,7 @@ main(int argc, char *argv[])
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if (!IsValidWalSegSize(wal_segment_size_mb * 1024 * 1024))
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{
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fprintf(stderr,
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_("%s: argument of --wal-segsize must be a power of two between 1 and 1024\n"),
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_("%s: argument of --wal-segsize must be a power of 2 between 1 and 1024\n"),
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progname);
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exit(1);
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}
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