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initdb: Change default to using data checksums.

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Checksums are now on by default.  They can be disabled by the
previously added option --no-data-checksums.

Author: Greg Sabino Mullane <greg@turnstep.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/CAKAnmmKwiMHik5AHmBEdf5vqzbOBbcwEPHo4-PioWeAbzwcTOQ@mail.gmail.com
This commit is contained in:
Peter Eisentraut 2024-10-16 08:45:09 +02:00
parent 67846550dc
commit 04bec894a0
3 changed files with 21 additions and 14 deletions
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15
doc/src/sgml/ref/initdb.sgml
View File

@ -265,8 +265,14 @@ PostgreSQL documentation
<term><option>--data-checksums</option></term> <term><option>--data-checksums</option></term>
<listitem> <listitem>
<para> <para>
Use checksums on data pages to help detect corruption by the Use checksums on data pages to help detect corruption by the I/O
I/O system that would otherwise be silent. Enabling checksums system that would otherwise be silent. This is enabled by default;
use <xref linkend="app-initdb-no-data-checksums"/> to disable
checksums.
</para>
<para>
Enabling checksums
might incur a small performance penalty. If set, checksums might incur a small performance penalty. If set, checksums
are calculated for all objects, in all databases. All checksum are calculated for all objects, in all databases. All checksum
failures will be reported in the failures will be reported in the
@ -343,12 +349,11 @@ PostgreSQL documentation
</listitem> </listitem>
</varlistentry> </varlistentry>
<varlistentry id="app-initdb-no-data-checksums" xreflabel="no data checksums"> <varlistentry id="app-initdb-no-data-checksums">
<term><option>--no-data-checksums</option></term> <term><option>--no-data-checksums</option></term>
<listitem> <listitem>
<para> <para>
Do not enable data checksums. This can be used to override a Do not enable data checksums.
<option>--data-checksums</option> option.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>

2
src/bin/initdb/initdb.c
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@ -164,7 +164,7 @@ static bool noinstructions = false;
static bool do_sync = true; static bool do_sync = true;
static bool sync_only = false; static bool sync_only = false;
static bool show_setting = false; static bool show_setting = false;
static bool data_checksums = false; static bool data_checksums = true;
static char *xlog_dir = NULL; static char *xlog_dir = NULL;
static int wal_segment_size_mb = (DEFAULT_XLOG_SEG_SIZE) / (1024 * 1024); static int wal_segment_size_mb = (DEFAULT_XLOG_SEG_SIZE) / (1024 * 1024);
static DataDirSyncMethod sync_method = DATA_DIR_SYNC_METHOD_FSYNC; static DataDirSyncMethod sync_method = DATA_DIR_SYNC_METHOD_FSYNC;

18
src/bin/initdb/t/001_initdb.pl
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@ -69,16 +69,11 @@ mkdir $datadir;
} }
} }
# Control file should tell that data checksums are disabled by default. # Control file should tell that data checksums are enabled by default.
command_like( command_like(
[ 'pg_controldata', $datadir ], [ 'pg_controldata', $datadir ],
qr/Data page checksum version:.*0/, qr/Data page checksum version:.*1/,
'checksums are disabled in control file'); 'checksums are enabled in control file');
# pg_checksums fails with checksums disabled by default. This is
# not part of the tests included in pg_checksums to save from
# the creation of an extra instance.
command_fails([ 'pg_checksums', '-D', $datadir ],
"pg_checksums fails with data checksum disabled");
command_ok([ 'initdb', '-S', $datadir ], 'sync only'); command_ok([ 'initdb', '-S', $datadir ], 'sync only');
command_fails([ 'initdb', $datadir ], 'existing data directory'); command_fails([ 'initdb', $datadir ], 'existing data directory');
@ -280,4 +275,11 @@ command_like(
qr/Data page checksum version:.*0/, qr/Data page checksum version:.*0/,
'checksums are disabled in control file'); 'checksums are disabled in control file');
# pg_checksums fails with checksums disabled. This is
# not part of the tests included in pg_checksums to save from
# the creation of an extra instance.
command_fails(
[ 'pg_checksums', '-D', $datadir_nochecksums ],
"pg_checksums fails with data checksum disabled");
done_testing(); done_testing();