</varlistentry>

<varlistentry>

<term><option>--wal-segsize=<replaceable>SEGSIZE</replaceable></option></term>

<term><option>--wal-segsize=<replaceable>size</replaceable></option></term>

<listitem>

<para>

Set the <firstterm>WAL segment size</firstterm>, in megabytes. This is

the size of each individual file in the WAL log. It may be useful

to adjust this size to control the granularity of WAL log shipping.

This option can only be set during initialization, and cannot be

changed later.

The default size is 16 megabytes.

The value must be a power of 2 between 1 and 1024 (megabytes).

Set the <firstterm>WAL segment size</firstterm>, in megabytes. This

is the size of each individual file in the WAL log. The default size

is 16 megabytes. The value must be a power of 2 between 1 and 1024

(megabytes). This option can only be set during initialization, and

cannot be changed later.

</para>

<para>

It may be useful to adjust this size to control the granularity of

WAL log shipping or archiving. Also, in databases with a high volume

of WAL, the sheer number of WAL files per directory can become a

performance and management problem. Increasing the WAL file size

will reduce the number of WAL files.

</para>

</listitem>

</varlistentry>

wal_segment_size_mb=strtol(str_wal_segment_size_mb,&endptr,10);

if (*endptr!='\0')

if (endptr==str_wal_segment_size_mb||*endptr!='\0')

{

fprintf(stderr,

_("%s: argument of --wal-segsize must be a number\n"),

if (!IsValidWalSegSize(wal_segment_size_mb*1024*1024))

{

fprintf(stderr,

_("%s: argument of --wal-segsize must be a power oftwo between 1 and 1024\n"),

_("%s: argument of --wal-segsize must be a power of2 between 1 and 1024\n"),

progname);

exit(1);

}