6 * Copyright (c) 2010-2011, PostgreSQL Global Development Group
7 * contrib/pg_upgrade/pg_upgrade.c
11 * To simplify the upgrade process, we force certain system values to be
12 * identical between old and new clusters:
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.
18 * FYI, while pg_class.oid and pg_class.relfilenode are intially the same
19 * in a cluster, but they can diverge due to CLUSTER, REINDEX, or VACUUM
20 * FULL. The new cluster will have matching pg_class.oid and
21 * pg_class.relfilenode values and be based on the old oid value. This can
22 * cause the old and new pg_class.relfilenode values to differ. In summary,
23 * old and new pg_class.oid and new pg_class.relfilenode will have the
24 * same value, and old pg_class.relfilenode might differ.
26 * We control all assignments of pg_type.oid because these oids are stored
27 * in user composite type values.
29 * We control all assignments of pg_enum.oid because these oids are stored
30 * in user tables as enum values.
32 * We control all assignments of pg_auth.oid because these oids are stored
33 * in pg_largeobject_metadata.
38 #include "pg_upgrade.h"
40 #ifdef HAVE_LANGINFO_H
44 static void disable_old_cluster(void);
45 static void prepare_new_cluster(void);
46 static void prepare_new_databases(void);
47 static void create_new_objects(void);
48 static void copy_clog_xlog_xid(void);
49 static void set_frozenxids(void);
50 static void setup(char *argv0, bool live_check);
51 static void cleanup(void);
53 ClusterInfo old_cluster, new_cluster;
57 main(int argc, char **argv)
59 char *sequence_script_file_name = NULL;
60 char *deletion_script_file_name = NULL;
61 bool live_check = false;
63 parseCommandLine(argc, argv);
65 output_check_banner(&live_check);
67 setup(argv[0], live_check);
69 check_cluster_versions();
70 check_cluster_compatibility(live_check);
72 check_old_cluster(live_check, &sequence_script_file_name);
76 start_postmaster(&new_cluster, false);
79 report_clusters_compatible();
81 pg_log(PG_REPORT, "\nPerforming Upgrade\n");
82 pg_log(PG_REPORT, "------------------\n");
84 disable_old_cluster();
85 prepare_new_cluster();
87 stop_postmaster(false, false);
90 * Destructive Changes to New Cluster
95 /* New now using xids of the old system */
97 prepare_new_databases();
101 transfer_all_new_dbs(&old_cluster.dbarr, &new_cluster.dbarr,
102 old_cluster.pgdata, new_cluster.pgdata);
105 * Assuming OIDs are only used in system tables, there is no need to
106 * restore the OID counter because we have not transferred any OIDs from
107 * the old system, but we do it anyway just in case. We do it late here
108 * because there is no need to have the schema load use new oids.
110 prep_status("Setting next oid for new cluster");
111 exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -o %u \"%s\" > "
113 new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid, new_cluster.pgdata);
116 create_script_for_old_cluster_deletion(&deletion_script_file_name);
118 issue_warnings(sequence_script_file_name);
120 pg_log(PG_REPORT, "\nUpgrade complete\n");
121 pg_log(PG_REPORT, "----------------\n");
123 output_completion_banner(deletion_script_file_name);
125 pg_free(deletion_script_file_name);
126 pg_free(sequence_script_file_name);
135 setup(char *argv0, bool live_check)
137 char exec_path[MAXPGPATH]; /* full path to my executable */
140 * make sure the user has a clean environment, otherwise, we may confuse
141 * libpq when we connect to one (or both) of the servers.
143 check_for_libpq_envvars();
145 verify_directories();
147 /* no postmasters should be running */
148 if (!live_check && is_server_running(old_cluster.pgdata))
150 pg_log(PG_FATAL, "There seems to be a postmaster servicing the old cluster.\n"
151 "Please shutdown that postmaster and try again.\n");
154 /* same goes for the new postmaster */
155 if (is_server_running(new_cluster.pgdata))
157 pg_log(PG_FATAL, "There seems to be a postmaster servicing the new cluster.\n"
158 "Please shutdown that postmaster and try again.\n");
161 /* get path to pg_upgrade executable */
162 if (find_my_exec(argv0, exec_path) < 0)
163 pg_log(PG_FATAL, "Could not get pathname to pg_upgrade: %s\n", getErrorText(errno));
165 /* Trim off program name and keep just path */
166 *last_dir_separator(exec_path) = '\0';
167 canonicalize_path(exec_path);
168 os_info.exec_path = pg_strdup(exec_path);
173 disable_old_cluster(void)
175 /* rename pg_control so old server cannot be accidentally started */
176 rename_old_pg_control();
181 prepare_new_cluster(void)
184 * It would make more sense to freeze after loading the schema, but that
185 * would cause us to lose the frozenids restored by the load. We use
186 * --analyze so autovacuum doesn't update statistics later
188 prep_status("Analyzing all rows in the new cluster");
190 SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
191 "--all --analyze >> %s 2>&1" SYSTEMQUOTE,
192 new_cluster.bindir, new_cluster.port, os_info.user, log_opts.filename);
196 * We do freeze after analyze so pg_statistic is also frozen. template0 is
197 * not frozen here, but data rows were frozen by initdb, and we set its
198 * datfrozenxid and relfrozenxids later to match the new xid counter
201 prep_status("Freezing all rows on the new cluster");
203 SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
204 "--all --freeze >> %s 2>&1" SYSTEMQUOTE,
205 new_cluster.bindir, new_cluster.port, os_info.user, log_opts.filename);
208 get_pg_database_relfilenode(&new_cluster);
213 prepare_new_databases(void)
216 start_postmaster(&new_cluster, false);
219 * We set autovacuum_freeze_max_age to its maximum value so autovacuum
220 * does not launch here and delete clog files, before the frozen xids are
226 prep_status("Creating databases in the new cluster");
229 * Install support functions in the database accessed by
230 * GLOBALS_DUMP_FILE because it can preserve pg_authid.oid.
232 install_support_functions_in_new_db(os_info.user);
235 * We have to create the databases first so we can install support
236 * functions in all the other databases.
239 SYSTEMQUOTE "\"%s/psql\" --set ON_ERROR_STOP=on "
240 /* --no-psqlrc prevents AUTOCOMMIT=off */
241 "--no-psqlrc --port %d --username \"%s\" "
242 "-f \"%s/%s\" --dbname template1 >> \"%s\"" SYSTEMQUOTE,
243 new_cluster.bindir, new_cluster.port, os_info.user, os_info.cwd,
244 GLOBALS_DUMP_FILE, log_opts.filename);
247 /* we load this to get a current list of databases */
248 get_db_and_rel_infos(&new_cluster);
250 stop_postmaster(false, false);
255 create_new_objects(void)
260 start_postmaster(&new_cluster, false);
262 prep_status("Adding support functions to new cluster");
264 for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
266 DbInfo *new_db = &new_cluster.dbarr.dbs[dbnum];
268 /* skip db we already installed */
269 if (strcmp(new_db->db_name, os_info.user) != 0)
270 install_support_functions_in_new_db(new_db->db_name);
274 prep_status("Restoring database schema to new cluster");
276 SYSTEMQUOTE "\"%s/psql\" --set ON_ERROR_STOP=on "
277 "--no-psqlrc --port %d --username \"%s\" "
278 "-f \"%s/%s\" --dbname template1 >> \"%s\"" SYSTEMQUOTE,
279 new_cluster.bindir, new_cluster.port, os_info.user, os_info.cwd,
280 DB_DUMP_FILE, log_opts.filename);
283 /* regenerate now that we have objects in the databases */
284 free_db_and_rel_infos(&new_cluster.dbarr);
285 get_db_and_rel_infos(&new_cluster);
287 uninstall_support_functions_from_new_cluster();
289 stop_postmaster(false, false);
294 copy_clog_xlog_xid(void)
296 char old_clog_path[MAXPGPATH];
297 char new_clog_path[MAXPGPATH];
299 /* copy old commit logs to new data dir */
300 prep_status("Deleting new commit clogs");
302 snprintf(old_clog_path, sizeof(old_clog_path), "%s/pg_clog", old_cluster.pgdata);
303 snprintf(new_clog_path, sizeof(new_clog_path), "%s/pg_clog", new_cluster.pgdata);
304 if (!rmtree(new_clog_path, true))
305 pg_log(PG_FATAL, "Unable to delete directory %s\n", new_clog_path);
308 prep_status("Copying old commit clogs to new server");
310 exec_prog(true, SYSTEMQUOTE "%s \"%s\" \"%s\"" SYSTEMQUOTE,
313 /* flags: everything, no confirm, quiet, overwrite read-only */
314 exec_prog(true, SYSTEMQUOTE "%s \"%s\" \"%s\\\"" SYSTEMQUOTE,
317 old_clog_path, new_clog_path);
320 /* set the next transaction id of the new cluster */
321 prep_status("Setting next transaction id for new cluster");
322 exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -f -x %u \"%s\" > " DEVNULL SYSTEMQUOTE,
323 new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid, new_cluster.pgdata);
326 /* now reset the wal archives in the new cluster */
327 prep_status("Resetting WAL archives");
328 exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -l %u,%u,%u \"%s\" >> \"%s\" 2>&1" SYSTEMQUOTE,
329 new_cluster.bindir, old_cluster.controldata.chkpnt_tli,
330 old_cluster.controldata.logid, old_cluster.controldata.nxtlogseg,
331 new_cluster.pgdata, log_opts.filename);
339 * We have frozen all xids, so set relfrozenxid and datfrozenxid
340 * to be the old cluster's xid counter, which we just set in the new
341 * cluster. User-table frozenxid values will be set by pg_dumpall
342 * --binary-upgrade, but objects not set by the pg_dump must have
343 * proper frozen counters.
357 prep_status("Setting frozenxid counters in new cluster");
359 conn_template1 = connectToServer(&new_cluster, "template1");
361 /* set pg_database.datfrozenxid */
362 PQclear(executeQueryOrDie(conn_template1,
363 "UPDATE pg_catalog.pg_database "
364 "SET datfrozenxid = '%u'",
365 old_cluster.controldata.chkpnt_nxtxid));
367 /* get database names */
368 dbres = executeQueryOrDie(conn_template1,
369 "SELECT datname, datallowconn "
370 "FROM pg_catalog.pg_database");
372 i_datname = PQfnumber(dbres, "datname");
373 i_datallowconn = PQfnumber(dbres, "datallowconn");
375 ntups = PQntuples(dbres);
376 for (dbnum = 0; dbnum < ntups; dbnum++)
378 char *datname = PQgetvalue(dbres, dbnum, i_datname);
379 char *datallowconn = PQgetvalue(dbres, dbnum, i_datallowconn);
382 * We must update databases where datallowconn = false, e.g.
383 * template0, because autovacuum increments their datfrozenxids and
384 * relfrozenxids even if autovacuum is turned off, and even though all
385 * the data rows are already frozen To enable this, we temporarily
386 * change datallowconn.
388 if (strcmp(datallowconn, "f") == 0)
389 PQclear(executeQueryOrDie(conn_template1,
390 "UPDATE pg_catalog.pg_database "
391 "SET datallowconn = true "
392 "WHERE datname = '%s'", datname));
394 conn = connectToServer(&new_cluster, datname);
396 /* set pg_class.relfrozenxid */
397 PQclear(executeQueryOrDie(conn,
398 "UPDATE pg_catalog.pg_class "
399 "SET relfrozenxid = '%u' "
400 /* only heap and TOAST are vacuumed */
401 "WHERE relkind IN ('r', 't')",
402 old_cluster.controldata.chkpnt_nxtxid));
405 /* Reset datallowconn flag */
406 if (strcmp(datallowconn, "f") == 0)
407 PQclear(executeQueryOrDie(conn_template1,
408 "UPDATE pg_catalog.pg_database "
409 "SET datallowconn = false "
410 "WHERE datname = '%s'", datname));
415 PQfinish(conn_template1);
425 char filename[MAXPGPATH];
427 for (tblnum = 0; tblnum < os_info.num_tablespaces; tblnum++)
428 pg_free(os_info.tablespaces[tblnum]);
429 pg_free(os_info.tablespaces);
431 free_db_and_rel_infos(&old_cluster.dbarr);
432 free_db_and_rel_infos(&new_cluster.dbarr);
433 pg_free(log_opts.filename);
434 pg_free(os_info.user);
435 pg_free(old_cluster.controldata.lc_collate);
436 pg_free(new_cluster.controldata.lc_collate);
437 pg_free(old_cluster.controldata.lc_ctype);
438 pg_free(new_cluster.controldata.lc_ctype);
439 pg_free(old_cluster.controldata.encoding);
440 pg_free(new_cluster.controldata.encoding);
441 pg_free(old_cluster.tablespace_suffix);
442 pg_free(new_cluster.tablespace_suffix);
444 if (log_opts.fd != NULL)
450 if (log_opts.debug_fd)
451 fclose(log_opts.debug_fd);
453 snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, ALL_DUMP_FILE);
455 snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, GLOBALS_DUMP_FILE);
457 snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, DB_DUMP_FILE);