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pg_upgrade.c
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1 /*
2  * pg_upgrade.c
3  *
4  * main source file
5  *
6  * Copyright (c) 2010-2024, PostgreSQL Global Development Group
7  * src/bin/pg_upgrade/pg_upgrade.c
8  */
9 
10 /*
11  * To simplify the upgrade process, we force certain system values to be
12  * identical between old and new clusters:
13  *
14  * We control all assignments of pg_class.oid (and relfilenode) so toast
15  * oids are the same between old and new clusters. This is important
16  * because toast oids are stored as toast pointers in user tables.
17  *
18  * While pg_class.oid and pg_class.relfilenode are initially the same in a
19  * cluster, they can diverge due to CLUSTER, REINDEX, or VACUUM FULL. We
20  * control assignments of pg_class.relfilenode because we want the filenames
21  * to match between the old and new cluster.
22  *
23  * We control assignment of pg_tablespace.oid because we want the oid to match
24  * between the old and new cluster.
25  *
26  * We control all assignments of pg_type.oid because these oids are stored
27  * in user composite type values.
28  *
29  * We control all assignments of pg_enum.oid because these oids are stored
30  * in user tables as enum values.
31  *
32  * We control all assignments of pg_authid.oid for historical reasons (the
33  * oids used to be stored in pg_largeobject_metadata, which is now copied via
34  * SQL commands), that might change at some point in the future.
35  */
36 
37 
38 
39 #include "postgres_fe.h"
40 
41 #include <time.h>
42 
43 #ifdef HAVE_LANGINFO_H
44 #include <langinfo.h>
45 #endif
46 
47 #include "catalog/pg_class_d.h"
48 #include "common/file_perm.h"
49 #include "common/logging.h"
51 #include "fe_utils/string_utils.h"
52 #include "pg_upgrade.h"
53 
54 static void set_locale_and_encoding(void);
55 static void prepare_new_cluster(void);
56 static void prepare_new_globals(void);
57 static void create_new_objects(void);
58 static void copy_xact_xlog_xid(void);
59 static void set_frozenxids(bool minmxid_only);
60 static void make_outputdirs(char *pgdata);
61 static void setup(char *argv0, bool *live_check);
62 static void create_logical_replication_slots(void);
63 
67 
68 char *output_files[] = {
70 #ifdef WIN32
71  /* unique file for pg_ctl start */
73 #endif
76  NULL
77 };
78 
79 
80 int
81 main(int argc, char **argv)
82 {
83  char *deletion_script_file_name = NULL;
84  bool live_check = false;
85 
86  /*
87  * pg_upgrade doesn't currently use common/logging.c, but initialize it
88  * anyway because we might call common code that does.
89  */
90  pg_logging_init(argv[0]);
91  set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_upgrade"));
92 
93  /* Set default restrictive mask until new cluster permissions are read */
94  umask(PG_MODE_MASK_OWNER);
95 
96  parseCommandLine(argc, argv);
97 
99 
102 
103  /*
104  * Set mask based on PGDATA permissions, needed for the creation of the
105  * output directories with correct permissions.
106  */
108  pg_fatal("could not read permissions of directory \"%s\": %m",
110 
111  umask(pg_mode_mask);
112 
113  /*
114  * This needs to happen after adjusting the data directory of the new
115  * cluster in adjust_data_dir().
116  */
118 
119  setup(argv[0], &live_check);
120 
121  output_check_banner(live_check);
122 
124 
125  get_sock_dir(&old_cluster, live_check);
126  get_sock_dir(&new_cluster, false);
127 
128  check_cluster_compatibility(live_check);
129 
130  check_and_dump_old_cluster(live_check);
131 
132 
133  /* -- NEW -- */
135 
138 
140  "\n"
141  "Performing Upgrade\n"
142  "------------------");
143 
145 
147 
148  stop_postmaster(false);
149 
150  /*
151  * Destructive Changes to New Cluster
152  */
153 
155 
156  /* New now using xids of the old system */
157 
158  /* -- NEW -- */
160 
162 
164 
165  stop_postmaster(false);
166 
167  /*
168  * Most failures happen in create_new_objects(), which has completed at
169  * this point. We do this here because it is just before linking, which
170  * will link the old and new cluster data files, preventing the old
171  * cluster from being safely started once the new cluster is started.
172  */
175 
178 
179  /*
180  * Assuming OIDs are only used in system tables, there is no need to
181  * restore the OID counter because we have not transferred any OIDs from
182  * the old system, but we do it anyway just in case. We do it late here
183  * because there is no need to have the schema load use new oids.
184  */
185  prep_status("Setting next OID for new cluster");
186  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
187  "\"%s/pg_resetwal\" -o %u \"%s\"",
190  check_ok();
191 
192  /*
193  * Migrate the logical slots to the new cluster. Note that we need to do
194  * this after resetting WAL because otherwise the required WAL would be
195  * removed and slots would become unusable. There is a possibility that
196  * background processes might generate some WAL before we could create the
197  * slots in the new cluster but we can ignore that WAL as that won't be
198  * required downstream.
199  */
201  {
204  stop_postmaster(false);
205  }
206 
207  if (user_opts.do_sync)
208  {
209  prep_status("Sync data directory to disk");
210  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
211  "\"%s/initdb\" --sync-only \"%s\" --sync-method %s",
215  check_ok();
216  }
217 
218  create_script_for_old_cluster_deletion(&deletion_script_file_name);
219 
221 
223  "\n"
224  "Upgrade Complete\n"
225  "----------------");
226 
227  output_completion_banner(deletion_script_file_name);
228 
229  pg_free(deletion_script_file_name);
230 
232 
233  return 0;
234 }
235 
236 /*
237  * Create and assign proper permissions to the set of output directories
238  * used to store any data generated internally, filling in log_opts in
239  * the process.
240  */
241 static void
242 make_outputdirs(char *pgdata)
243 {
244  FILE *fp;
245  char **filename;
246  time_t run_time = time(NULL);
247  char filename_path[MAXPGPATH];
248  char timebuf[128];
249  struct timeval time;
250  time_t tt;
251  int len;
252 
253  log_opts.rootdir = (char *) pg_malloc0(MAXPGPATH);
254  len = snprintf(log_opts.rootdir, MAXPGPATH, "%s/%s", pgdata, BASE_OUTPUTDIR);
255  if (len >= MAXPGPATH)
256  pg_fatal("directory path for new cluster is too long");
257 
258  /* BASE_OUTPUTDIR/$timestamp/ */
259  gettimeofday(&time, NULL);
260  tt = (time_t) time.tv_sec;
261  strftime(timebuf, sizeof(timebuf), "%Y%m%dT%H%M%S", localtime(&tt));
262  /* append milliseconds */
263  snprintf(timebuf + strlen(timebuf), sizeof(timebuf) - strlen(timebuf),
264  ".%03d", (int) (time.tv_usec / 1000));
265  log_opts.basedir = (char *) pg_malloc0(MAXPGPATH);
267  timebuf);
268  if (len >= MAXPGPATH)
269  pg_fatal("directory path for new cluster is too long");
270 
271  /* BASE_OUTPUTDIR/$timestamp/dump/ */
272  log_opts.dumpdir = (char *) pg_malloc0(MAXPGPATH);
274  timebuf, DUMP_OUTPUTDIR);
275  if (len >= MAXPGPATH)
276  pg_fatal("directory path for new cluster is too long");
277 
278  /* BASE_OUTPUTDIR/$timestamp/log/ */
279  log_opts.logdir = (char *) pg_malloc0(MAXPGPATH);
281  timebuf, LOG_OUTPUTDIR);
282  if (len >= MAXPGPATH)
283  pg_fatal("directory path for new cluster is too long");
284 
285  /*
286  * Ignore the error case where the root path exists, as it is kept the
287  * same across runs.
288  */
289  if (mkdir(log_opts.rootdir, pg_dir_create_mode) < 0 && errno != EEXIST)
290  pg_fatal("could not create directory \"%s\": %m", log_opts.rootdir);
292  pg_fatal("could not create directory \"%s\": %m", log_opts.basedir);
294  pg_fatal("could not create directory \"%s\": %m", log_opts.dumpdir);
296  pg_fatal("could not create directory \"%s\": %m", log_opts.logdir);
297 
298  len = snprintf(filename_path, sizeof(filename_path), "%s/%s",
300  if (len >= sizeof(filename_path))
301  pg_fatal("directory path for new cluster is too long");
302 
303  if ((log_opts.internal = fopen_priv(filename_path, "a")) == NULL)
304  pg_fatal("could not open log file \"%s\": %m", filename_path);
305 
306  /* label start of upgrade in logfiles */
307  for (filename = output_files; *filename != NULL; filename++)
308  {
309  len = snprintf(filename_path, sizeof(filename_path), "%s/%s",
311  if (len >= sizeof(filename_path))
312  pg_fatal("directory path for new cluster is too long");
313  if ((fp = fopen_priv(filename_path, "a")) == NULL)
314  pg_fatal("could not write to log file \"%s\": %m", filename_path);
315 
316  fprintf(fp,
317  "-----------------------------------------------------------------\n"
318  " pg_upgrade run on %s"
319  "-----------------------------------------------------------------\n\n",
320  ctime(&run_time));
321  fclose(fp);
322  }
323 }
324 
325 
326 static void
327 setup(char *argv0, bool *live_check)
328 {
329  /*
330  * make sure the user has a clean environment, otherwise, we may confuse
331  * libpq when we connect to one (or both) of the servers.
332  */
334 
335  /*
336  * In case the user hasn't specified the directory for the new binaries
337  * with -B, default to using the path of the currently executed pg_upgrade
338  * binary.
339  */
340  if (!new_cluster.bindir)
341  {
342  char exec_path[MAXPGPATH];
343 
344  if (find_my_exec(argv0, exec_path) < 0)
345  pg_fatal("%s: could not find own program executable", argv0);
346  /* Trim off program name and keep just path */
347  *last_dir_separator(exec_path) = '\0';
350  }
351 
353 
354  /* no postmasters should be running, except for a live check */
356  {
357  /*
358  * If we have a postmaster.pid file, try to start the server. If it
359  * starts, the pid file was stale, so stop the server. If it doesn't
360  * start, assume the server is running. If the pid file is left over
361  * from a server crash, this also allows any committed transactions
362  * stored in the WAL to be replayed so they are not lost, because WAL
363  * files are not transferred from old to new servers. We later check
364  * for a clean shutdown.
365  */
366  if (start_postmaster(&old_cluster, false))
367  stop_postmaster(false);
368  else
369  {
370  if (!user_opts.check)
371  pg_fatal("There seems to be a postmaster servicing the old cluster.\n"
372  "Please shutdown that postmaster and try again.");
373  else
374  *live_check = true;
375  }
376  }
377 
378  /* same goes for the new postmaster */
380  {
381  if (start_postmaster(&new_cluster, false))
382  stop_postmaster(false);
383  else
384  pg_fatal("There seems to be a postmaster servicing the new cluster.\n"
385  "Please shutdown that postmaster and try again.");
386  }
387 }
388 
389 
390 /*
391  * Copy locale and encoding information into the new cluster's template0.
392  *
393  * We need to copy the encoding, datlocprovider, datcollate, datctype, and
394  * datlocale. We don't need datcollversion because that's never set for
395  * template0.
396  */
397 static void
399 {
400  PGconn *conn_new_template1;
401  char *datcollate_literal;
402  char *datctype_literal;
403  char *datlocale_literal = NULL;
405 
406  prep_status("Setting locale and encoding for new cluster");
407 
408  /* escape literals with respect to new cluster */
409  conn_new_template1 = connectToServer(&new_cluster, "template1");
410 
411  datcollate_literal = PQescapeLiteral(conn_new_template1,
412  locale->db_collate,
413  strlen(locale->db_collate));
414  datctype_literal = PQescapeLiteral(conn_new_template1,
415  locale->db_ctype,
416  strlen(locale->db_ctype));
417  if (locale->db_locale)
418  datlocale_literal = PQescapeLiteral(conn_new_template1,
419  locale->db_locale,
420  strlen(locale->db_locale));
421  else
422  datlocale_literal = pg_strdup("NULL");
423 
424  /* update template0 in new cluster */
426  PQclear(executeQueryOrDie(conn_new_template1,
427  "UPDATE pg_catalog.pg_database "
428  " SET encoding = %d, "
429  " datlocprovider = '%c', "
430  " datcollate = %s, "
431  " datctype = %s, "
432  " datlocale = %s "
433  " WHERE datname = 'template0' ",
434  locale->db_encoding,
435  locale->db_collprovider,
436  datcollate_literal,
437  datctype_literal,
438  datlocale_literal));
439  else if (GET_MAJOR_VERSION(new_cluster.major_version) >= 1500)
440  PQclear(executeQueryOrDie(conn_new_template1,
441  "UPDATE pg_catalog.pg_database "
442  " SET encoding = %d, "
443  " datlocprovider = '%c', "
444  " datcollate = %s, "
445  " datctype = %s, "
446  " daticulocale = %s "
447  " WHERE datname = 'template0' ",
448  locale->db_encoding,
449  locale->db_collprovider,
450  datcollate_literal,
451  datctype_literal,
452  datlocale_literal));
453  else
454  PQclear(executeQueryOrDie(conn_new_template1,
455  "UPDATE pg_catalog.pg_database "
456  " SET encoding = %d, "
457  " datcollate = %s, "
458  " datctype = %s "
459  " WHERE datname = 'template0' ",
460  locale->db_encoding,
461  datcollate_literal,
462  datctype_literal));
463 
464  PQfreemem(datcollate_literal);
465  PQfreemem(datctype_literal);
466  PQfreemem(datlocale_literal);
467 
468  PQfinish(conn_new_template1);
469 
470  check_ok();
471 }
472 
473 
474 static void
476 {
477  /*
478  * It would make more sense to freeze after loading the schema, but that
479  * would cause us to lose the frozenxids restored by the load. We use
480  * --analyze so autovacuum doesn't update statistics later
481  */
482  prep_status("Analyzing all rows in the new cluster");
483  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
484  "\"%s/vacuumdb\" %s --all --analyze %s",
486  log_opts.verbose ? "--verbose" : "");
487  check_ok();
488 
489  /*
490  * We do freeze after analyze so pg_statistic is also frozen. template0 is
491  * not frozen here, but data rows were frozen by initdb, and we set its
492  * datfrozenxid, relfrozenxids, and relminmxid later to match the new xid
493  * counter later.
494  */
495  prep_status("Freezing all rows in the new cluster");
496  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
497  "\"%s/vacuumdb\" %s --all --freeze %s",
499  log_opts.verbose ? "--verbose" : "");
500  check_ok();
501 }
502 
503 
504 static void
506 {
507  /*
508  * Before we restore anything, set frozenxids of initdb-created tables.
509  */
510  set_frozenxids(false);
511 
512  /*
513  * Now restore global objects (roles and tablespaces).
514  */
515  prep_status("Restoring global objects in the new cluster");
516 
517  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
518  "\"%s/psql\" " EXEC_PSQL_ARGS " %s -f \"%s/%s\"",
522  check_ok();
523 }
524 
525 
526 static void
528 {
529  int dbnum;
530 
531  prep_status_progress("Restoring database schemas in the new cluster");
532 
533  /*
534  * We cannot process the template1 database concurrently with others,
535  * because when it's transiently dropped, connection attempts would fail.
536  * So handle it in a separate non-parallelized pass.
537  */
538  for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
539  {
540  char sql_file_name[MAXPGPATH],
541  log_file_name[MAXPGPATH];
542  DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
543  const char *create_opts;
544 
545  /* Process only template1 in this pass */
546  if (strcmp(old_db->db_name, "template1") != 0)
547  continue;
548 
549  pg_log(PG_STATUS, "%s", old_db->db_name);
550  snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
551  snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
552 
553  /*
554  * template1 database will already exist in the target installation,
555  * so tell pg_restore to drop and recreate it; otherwise we would fail
556  * to propagate its database-level properties.
557  */
558  create_opts = "--clean --create";
559 
560  exec_prog(log_file_name,
561  NULL,
562  true,
563  true,
564  "\"%s/pg_restore\" %s %s --exit-on-error --verbose "
565  "--dbname postgres \"%s/%s\"",
568  create_opts,
570  sql_file_name);
571 
572  break; /* done once we've processed template1 */
573  }
574 
575  for (dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
576  {
577  char sql_file_name[MAXPGPATH],
578  log_file_name[MAXPGPATH];
579  DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
580  const char *create_opts;
581 
582  /* Skip template1 in this pass */
583  if (strcmp(old_db->db_name, "template1") == 0)
584  continue;
585 
586  pg_log(PG_STATUS, "%s", old_db->db_name);
587  snprintf(sql_file_name, sizeof(sql_file_name), DB_DUMP_FILE_MASK, old_db->db_oid);
588  snprintf(log_file_name, sizeof(log_file_name), DB_DUMP_LOG_FILE_MASK, old_db->db_oid);
589 
590  /*
591  * postgres database will already exist in the target installation, so
592  * tell pg_restore to drop and recreate it; otherwise we would fail to
593  * propagate its database-level properties.
594  */
595  if (strcmp(old_db->db_name, "postgres") == 0)
596  create_opts = "--clean --create";
597  else
598  create_opts = "--create";
599 
600  parallel_exec_prog(log_file_name,
601  NULL,
602  "\"%s/pg_restore\" %s %s --exit-on-error --verbose "
603  "--dbname template1 \"%s/%s\"",
606  create_opts,
608  sql_file_name);
609  }
610 
611  /* reap all children */
612  while (reap_child(true) == true)
613  ;
614 
616  check_ok();
617 
618  /*
619  * We don't have minmxids for databases or relations in pre-9.3 clusters,
620  * so set those after we have restored the schema.
621  */
623  set_frozenxids(true);
624 
625  /* update new_cluster info now that we have objects in the databases */
627 }
628 
629 /*
630  * Delete the given subdirectory contents from the new cluster
631  */
632 static void
633 remove_new_subdir(const char *subdir, bool rmtopdir)
634 {
635  char new_path[MAXPGPATH];
636 
637  prep_status("Deleting files from new %s", subdir);
638 
639  snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, subdir);
640  if (!rmtree(new_path, rmtopdir))
641  pg_fatal("could not delete directory \"%s\"", new_path);
642 
643  check_ok();
644 }
645 
646 /*
647  * Copy the files from the old cluster into it
648  */
649 static void
650 copy_subdir_files(const char *old_subdir, const char *new_subdir)
651 {
652  char old_path[MAXPGPATH];
653  char new_path[MAXPGPATH];
654 
655  remove_new_subdir(new_subdir, true);
656 
657  snprintf(old_path, sizeof(old_path), "%s/%s", old_cluster.pgdata, old_subdir);
658  snprintf(new_path, sizeof(new_path), "%s/%s", new_cluster.pgdata, new_subdir);
659 
660  prep_status("Copying old %s to new server", old_subdir);
661 
662  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
663 #ifndef WIN32
664  "cp -Rf \"%s\" \"%s\"",
665 #else
666  /* flags: everything, no confirm, quiet, overwrite read-only */
667  "xcopy /e /y /q /r \"%s\" \"%s\\\"",
668 #endif
669  old_path, new_path);
670 
671  check_ok();
672 }
673 
674 static void
676 {
677  /*
678  * Copy old commit logs to new data dir. pg_clog has been renamed to
679  * pg_xact in post-10 clusters.
680  */
682  "pg_clog" : "pg_xact",
684  "pg_clog" : "pg_xact");
685 
686  prep_status("Setting oldest XID for new cluster");
687  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
688  "\"%s/pg_resetwal\" -f -u %u \"%s\"",
691  check_ok();
692 
693  /* set the next transaction id and epoch of the new cluster */
694  prep_status("Setting next transaction ID and epoch for new cluster");
695  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
696  "\"%s/pg_resetwal\" -f -x %u \"%s\"",
699  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
700  "\"%s/pg_resetwal\" -f -e %u \"%s\"",
703  /* must reset commit timestamp limits also */
704  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
705  "\"%s/pg_resetwal\" -f -c %u,%u \"%s\"",
710  check_ok();
711 
712  /*
713  * If the old server is before the MULTIXACT_FORMATCHANGE_CAT_VER change
714  * (see pg_upgrade.h) and the new server is after, then we don't copy
715  * pg_multixact files, but we need to reset pg_control so that the new
716  * server doesn't attempt to read multis older than the cutoff value.
717  */
720  {
721  copy_subdir_files("pg_multixact/offsets", "pg_multixact/offsets");
722  copy_subdir_files("pg_multixact/members", "pg_multixact/members");
723 
724  prep_status("Setting next multixact ID and offset for new cluster");
725 
726  /*
727  * we preserve all files and contents, so we must preserve both "next"
728  * counters here and the oldest multi present on system.
729  */
730  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
731  "\"%s/pg_resetwal\" -O %u -m %u,%u \"%s\"",
737  check_ok();
738  }
740  {
741  /*
742  * Remove offsets/0000 file created by initdb that no longer matches
743  * the new multi-xid value. "members" starts at zero so no need to
744  * remove it.
745  */
746  remove_new_subdir("pg_multixact/offsets", false);
747 
748  prep_status("Setting oldest multixact ID in new cluster");
749 
750  /*
751  * We don't preserve files in this case, but it's important that the
752  * oldest multi is set to the latest value used by the old system, so
753  * that multixact.c returns the empty set for multis that might be
754  * present on disk. We set next multi to the value following that; it
755  * might end up wrapped around (i.e. 0) if the old cluster had
756  * next=MaxMultiXactId, but multixact.c can cope with that just fine.
757  */
758  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
759  "\"%s/pg_resetwal\" -m %u,%u \"%s\"",
764  check_ok();
765  }
766 
767  /* now reset the wal archives in the new cluster */
768  prep_status("Resetting WAL archives");
769  exec_prog(UTILITY_LOG_FILE, NULL, true, true,
770  /* use timeline 1 to match controldata and no WAL history file */
771  "\"%s/pg_resetwal\" -l 00000001%s \"%s\"", new_cluster.bindir,
774  check_ok();
775 }
776 
777 
778 /*
779  * set_frozenxids()
780  *
781  * This is called on the new cluster before we restore anything, with
782  * minmxid_only = false. Its purpose is to ensure that all initdb-created
783  * vacuumable tables have relfrozenxid/relminmxid matching the old cluster's
784  * xid/mxid counters. We also initialize the datfrozenxid/datminmxid of the
785  * built-in databases to match.
786  *
787  * As we create user tables later, their relfrozenxid/relminmxid fields will
788  * be restored properly by the binary-upgrade restore script. Likewise for
789  * user-database datfrozenxid/datminmxid. However, if we're upgrading from a
790  * pre-9.3 database, which does not store per-table or per-DB minmxid, then
791  * the relminmxid/datminmxid values filled in by the restore script will just
792  * be zeroes.
793  *
794  * Hence, with a pre-9.3 source database, a second call occurs after
795  * everything is restored, with minmxid_only = true. This pass will
796  * initialize all tables and databases, both those made by initdb and user
797  * objects, with the desired minmxid value. frozenxid values are left alone.
798  */
799 static void
800 set_frozenxids(bool minmxid_only)
801 {
802  int dbnum;
803  PGconn *conn,
804  *conn_template1;
805  PGresult *dbres;
806  int ntups;
807  int i_datname;
808  int i_datallowconn;
809 
810  if (!minmxid_only)
811  prep_status("Setting frozenxid and minmxid counters in new cluster");
812  else
813  prep_status("Setting minmxid counter in new cluster");
814 
815  conn_template1 = connectToServer(&new_cluster, "template1");
816 
817  if (!minmxid_only)
818  /* set pg_database.datfrozenxid */
819  PQclear(executeQueryOrDie(conn_template1,
820  "UPDATE pg_catalog.pg_database "
821  "SET datfrozenxid = '%u'",
823 
824  /* set pg_database.datminmxid */
825  PQclear(executeQueryOrDie(conn_template1,
826  "UPDATE pg_catalog.pg_database "
827  "SET datminmxid = '%u'",
829 
830  /* get database names */
831  dbres = executeQueryOrDie(conn_template1,
832  "SELECT datname, datallowconn "
833  "FROM pg_catalog.pg_database");
834 
835  i_datname = PQfnumber(dbres, "datname");
836  i_datallowconn = PQfnumber(dbres, "datallowconn");
837 
838  ntups = PQntuples(dbres);
839  for (dbnum = 0; dbnum < ntups; dbnum++)
840  {
841  char *datname = PQgetvalue(dbres, dbnum, i_datname);
842  char *datallowconn = PQgetvalue(dbres, dbnum, i_datallowconn);
843 
844  /*
845  * We must update databases where datallowconn = false, e.g.
846  * template0, because autovacuum increments their datfrozenxids,
847  * relfrozenxids, and relminmxid even if autovacuum is turned off, and
848  * even though all the data rows are already frozen. To enable this,
849  * we temporarily change datallowconn.
850  */
851  if (strcmp(datallowconn, "f") == 0)
852  PQclear(executeQueryOrDie(conn_template1,
853  "ALTER DATABASE %s ALLOW_CONNECTIONS = true",
855 
857 
858  if (!minmxid_only)
859  /* set pg_class.relfrozenxid */
861  "UPDATE pg_catalog.pg_class "
862  "SET relfrozenxid = '%u' "
863  /* only heap, materialized view, and TOAST are vacuumed */
864  "WHERE relkind IN ("
865  CppAsString2(RELKIND_RELATION) ", "
866  CppAsString2(RELKIND_MATVIEW) ", "
867  CppAsString2(RELKIND_TOASTVALUE) ")",
869 
870  /* set pg_class.relminmxid */
872  "UPDATE pg_catalog.pg_class "
873  "SET relminmxid = '%u' "
874  /* only heap, materialized view, and TOAST are vacuumed */
875  "WHERE relkind IN ("
876  CppAsString2(RELKIND_RELATION) ", "
877  CppAsString2(RELKIND_MATVIEW) ", "
878  CppAsString2(RELKIND_TOASTVALUE) ")",
880  PQfinish(conn);
881 
882  /* Reset datallowconn flag */
883  if (strcmp(datallowconn, "f") == 0)
884  PQclear(executeQueryOrDie(conn_template1,
885  "ALTER DATABASE %s ALLOW_CONNECTIONS = false",
887  }
888 
889  PQclear(dbres);
890 
891  PQfinish(conn_template1);
892 
893  check_ok();
894 }
895 
896 /*
897  * create_logical_replication_slots()
898  *
899  * Similar to create_new_objects() but only restores logical replication slots.
900  */
901 static void
903 {
904  prep_status_progress("Restoring logical replication slots in the new cluster");
905 
906  for (int dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
907  {
908  DbInfo *old_db = &old_cluster.dbarr.dbs[dbnum];
909  LogicalSlotInfoArr *slot_arr = &old_db->slot_arr;
910  PGconn *conn;
911  PQExpBuffer query;
912 
913  /* Skip this database if there are no slots */
914  if (slot_arr->nslots == 0)
915  continue;
916 
918  query = createPQExpBuffer();
919 
920  pg_log(PG_STATUS, "%s", old_db->db_name);
921 
922  for (int slotnum = 0; slotnum < slot_arr->nslots; slotnum++)
923  {
924  LogicalSlotInfo *slot_info = &slot_arr->slots[slotnum];
925 
926  /* Constructs a query for creating logical replication slots */
927  appendPQExpBuffer(query,
928  "SELECT * FROM "
929  "pg_catalog.pg_create_logical_replication_slot(");
930  appendStringLiteralConn(query, slot_info->slotname, conn);
931  appendPQExpBuffer(query, ", ");
932  appendStringLiteralConn(query, slot_info->plugin, conn);
933 
934  appendPQExpBuffer(query, ", false, %s, %s);",
935  slot_info->two_phase ? "true" : "false",
936  slot_info->failover ? "true" : "false");
937 
938  PQclear(executeQueryOrDie(conn, "%s", query->data));
939 
940  resetPQExpBuffer(query);
941  }
942 
943  PQfinish(conn);
944 
945  destroyPQExpBuffer(query);
946  }
947 
949  check_ok();
950 
951  return;
952 }
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