diff --git a/contrib/pg_upgrade/pg_upgrade.c b/contrib/pg_upgrade/pg_upgrade.c
new file mode 100644
index c12f15b..63df529
*** a/contrib/pg_upgrade/pg_upgrade.c
--- b/contrib/pg_upgrade/pg_upgrade.c
*************** main(int argc, char **argv)
*** 150,155 ****
--- 150,161 ----
new_cluster.pgdata);
check_ok();
+ prep_status("Sync data directory to disk");
+ exec_prog(UTILITY_LOG_FILE, NULL, true,
+ "\"%s/initdb\" --sync-only \"%s\"", new_cluster.bindir,
+ new_cluster.pgdata);
+ check_ok();
+
create_script_for_cluster_analyze(&analyze_script_file_name);
create_script_for_old_cluster_deletion(&deletion_script_file_name);
diff --git a/contrib/pg_upgrade/server.c b/contrib/pg_upgrade/server.c
new file mode 100644
index 49d4c8f..05d8cc0
*** a/contrib/pg_upgrade/server.c
--- b/contrib/pg_upgrade/server.c
*************** start_postmaster(ClusterInfo *cluster)
*** 209,217 ****
* a gap of 2000000000 from the current xid counter, so autovacuum will
* not touch them.
*
! * synchronous_commit=off improves object creation speed, and we only
! * modify the new cluster, so only use it there. If there is a crash,
! * the new cluster has to be recreated anyway.
*/
snprintf(cmd, sizeof(cmd),
"\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d%s%s%s%s\" start",
--- 209,217 ----
* a gap of 2000000000 from the current xid counter, so autovacuum will
* not touch them.
*
! * Turn off durability requirements to improve object creation speed, and
! * we only modify the new cluster, so only use it there. If there is a
! * crash, the new cluster has to be recreated anyway.
*/
snprintf(cmd, sizeof(cmd),
"\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d%s%s%s%s\" start",
*************** start_postmaster(ClusterInfo *cluster)
*** 219,225 ****
(cluster->controldata.cat_ver >=
BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? " -b" :
" -c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
! (cluster == &new_cluster) ? " -c synchronous_commit=off" : "",
cluster->pgopts ? cluster->pgopts : "", socket_string);
/*
--- 219,226 ----
(cluster->controldata.cat_ver >=
BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? " -b" :
" -c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
! (cluster == &new_cluster) ?
! " -c synchronous_commit=off -c fsync=off -c full_page_writes=off" : "",
cluster->pgopts ? cluster->pgopts : "", socket_string);
/*
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
new file mode 100644
index b56070b..b7df8ce
*** a/doc/src/sgml/config.sgml
--- b/doc/src/sgml/config.sgml
*************** include 'filename'
*** 1697,1702 ****
--- 1697,1711 ----
+ For reliable recovery when changing fsync
+ off to on, it is necessary to force all modified buffers in the
+ kernel to durable storage. This can be done while the cluster
+ is shutdown or while fsync is on by running initdb
+ --sync-only, running sync, unmounting the
+ file system, or rebooting the server.
+
+
+
In many situations, turning off
for noncritical transactions can provide much of the potential
performance benefit of turning off fsync, without
diff --git a/doc/src/sgml/ref/initdb.sgml b/doc/src/sgml/ref/initdb.sgml
new file mode 100644
index 08ee37e..a1e46eb
*** a/doc/src/sgml/ref/initdb.sgml
--- b/doc/src/sgml/ref/initdb.sgml
*************** PostgreSQL documentation
*** 245,250 ****
--- 245,261 ----
+
+
+
+
+ Safely write all database files to disk and exit. This does not
+ perform any of the normal initdb operations.
+
+
+
+
+
diff --git a/src/bin/initdb/initdb.c b/src/bin/initdb/initdb.c
new file mode 100644
index 402504b..8c0a9f4
*** a/src/bin/initdb/initdb.c
--- b/src/bin/initdb/initdb.c
*************** static const char *authmethodlocal = "";
*** 118,123 ****
--- 118,124 ----
static bool debug = false;
static bool noclean = false;
static bool do_sync = true;
+ static bool sync_only = false;
static bool show_setting = false;
static char *xlog_dir = "";
*************** usage(const char *progname)
*** 2796,2801 ****
--- 2797,2803 ----
printf(_(" -n, --noclean do not clean up after errors\n"));
printf(_(" -N, --nosync do not wait for changes to be written safely to disk\n"));
printf(_(" -s, --show show internal settings\n"));
+ printf(_(" -S, --sync-only only sync data directory\n"));
printf(_("\nOther options:\n"));
printf(_(" -V, --version output version information, then exit\n"));
printf(_(" -?, --help show this help, then exit\n"));
*************** main(int argc, char *argv[])
*** 3445,3450 ****
--- 3447,3453 ----
{"show", no_argument, NULL, 's'},
{"noclean", no_argument, NULL, 'n'},
{"nosync", no_argument, NULL, 'N'},
+ {"sync-only", no_argument, NULL, 'S'},
{"xlogdir", required_argument, NULL, 'X'},
{NULL, 0, NULL, 0}
};
*************** main(int argc, char *argv[])
*** 3476,3482 ****
/* process command-line options */
! while ((c = getopt_long(argc, argv, "dD:E:L:nNU:WA:sT:X:", long_options, &option_index)) != -1)
{
switch (c)
{
--- 3479,3485 ----
/* process command-line options */
! while ((c = getopt_long(argc, argv, "dD:E:L:nNU:WA:sST:X:", long_options, &option_index)) != -1)
{
switch (c)
{
*************** main(int argc, char *argv[])
*** 3522,3527 ****
--- 3525,3533 ----
case 'N':
do_sync = false;
break;
+ case 'S':
+ sync_only = true;
+ break;
case 'L':
share_path = pg_strdup(optarg);
break;
*************** main(int argc, char *argv[])
*** 3589,3594 ****
--- 3595,3608 ----
exit(1);
}
+ /* If we only need to fsync, just to it and exit */
+ if (sync_only)
+ {
+ setup_pgdata();
+ perform_fsync();
+ return 0;
+ }
+
if (pwprompt && pwfilename)
{
fprintf(stderr, _("%s: password prompt and password file cannot be specified together\n"), progname);