granicus.if.org Git - postgresql/blob - contrib/pg_upgrade/pg_upgrade.c

   1 /*
   2  *      pg_upgrade.c
   3  *
   4  *      main source file
   5  *
   6  *      Copyright (c) 2010-2011, PostgreSQL Global Development Group
   7  *      contrib/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  *      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.
  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_auth.oid because these oids are stored
  33  *      in pg_largeobject_metadata.
  34  */
  35
  36
  37
  38 #include "pg_upgrade.h"
  39
  40 #ifdef HAVE_LANGINFO_H
  41 #include <langinfo.h>
  42 #endif
  43
  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);
  52
  53 /* This is the database used by pg_dumpall to restore global tables */
  54 #define GLOBAL_DUMP_DB  "postgres"
  55
  56 ClusterInfo old_cluster,
  57                         new_cluster;
  58 OSInfo          os_info;
  59
  60 int
  61 main(int argc, char **argv)
  62 {
  63         char       *sequence_script_file_name = NULL;
  64         char       *deletion_script_file_name = NULL;
  65         bool            live_check = false;
  66
  67         parseCommandLine(argc, argv);
  68
  69         output_check_banner(&live_check);
  70
  71         setup(argv[0], live_check);
  72
  73         check_cluster_versions();
  74         check_cluster_compatibility(live_check);
  75
  76         check_old_cluster(live_check, &sequence_script_file_name);
  77
  78
  79         /* -- NEW -- */
  80         start_postmaster(&new_cluster);
  81
  82         check_new_cluster();
  83         report_clusters_compatible();
  84
  85         pg_log(PG_REPORT, "\nPerforming Upgrade\n");
  86         pg_log(PG_REPORT, "------------------\n");
  87
  88         disable_old_cluster();
  89         prepare_new_cluster();
  90
  91         stop_postmaster(false);
  92
  93         /*
  94          * Destructive Changes to New Cluster
  95          */
  96
  97         copy_clog_xlog_xid();
  98
  99         /* New now using xids of the old system */
 100
 101         /* -- NEW -- */
 102         start_postmaster(&new_cluster);
 103
 104         prepare_new_databases();
 105
 106         create_new_objects();
 107
 108         stop_postmaster(false);
 109
 110         transfer_all_new_dbs(&old_cluster.dbarr, &new_cluster.dbarr,
 111                                                  old_cluster.pgdata, new_cluster.pgdata);
 112
 113         /*
 114          * Assuming OIDs are only used in system tables, there is no need to
 115          * restore the OID counter because we have not transferred any OIDs from
 116          * the old system, but we do it anyway just in case.  We do it late here
 117          * because there is no need to have the schema load use new oids.
 118          */
 119         prep_status("Setting next OID for new cluster");
 120         exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -o %u \"%s\" > "
 121                           DEVNULL SYSTEMQUOTE,
 122                           new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid, new_cluster.pgdata);
 123         check_ok();
 124
 125         create_script_for_old_cluster_deletion(&deletion_script_file_name);
 126
 127         issue_warnings(sequence_script_file_name);
 128
 129         pg_log(PG_REPORT, "\nUpgrade complete\n");
 130         pg_log(PG_REPORT, "----------------\n");
 131
 132         output_completion_banner(deletion_script_file_name);
 133
 134         pg_free(deletion_script_file_name);
 135         pg_free(sequence_script_file_name);
 136
 137         cleanup();
 138
 139         return 0;
 140 }
 141
 142
 143 static void
 144 setup(char *argv0, bool live_check)
 145 {
 146         char            exec_path[MAXPGPATH];   /* full path to my executable */
 147
 148         /*
 149          * make sure the user has a clean environment, otherwise, we may confuse
 150          * libpq when we connect to one (or both) of the servers.
 151          */
 152         check_pghost_envvar();
 153
 154         verify_directories();
 155
 156         /* no postmasters should be running */
 157         if (!live_check && is_server_running(old_cluster.pgdata))
 158                 pg_log(PG_FATAL, "There seems to be a postmaster servicing the old cluster.\n"
 159                            "Please shutdown that postmaster and try again.\n");
 160
 161         /* same goes for the new postmaster */
 162         if (is_server_running(new_cluster.pgdata))
 163                 pg_log(PG_FATAL, "There seems to be a postmaster servicing the new cluster.\n"
 164                            "Please shutdown that postmaster and try again.\n");
 165
 166         /* get path to pg_upgrade executable */
 167         if (find_my_exec(argv0, exec_path) < 0)
 168                 pg_log(PG_FATAL, "Could not get path name to pg_upgrade: %s\n", getErrorText(errno));
 169
 170         /* Trim off program name and keep just path */
 171         *last_dir_separator(exec_path) = '\0';
 172         canonicalize_path(exec_path);
 173         os_info.exec_path = pg_strdup(exec_path);
 174 }
 175
 176
 177 static void
 178 disable_old_cluster(void)
 179 {
 180         /* rename pg_control so old server cannot be accidentally started */
 181         rename_old_pg_control();
 182 }
 183
 184
 185 static void
 186 prepare_new_cluster(void)
 187 {
 188         /*
 189          * It would make more sense to freeze after loading the schema, but that
 190          * would cause us to lose the frozenids restored by the load. We use
 191          * --analyze so autovacuum doesn't update statistics later
 192          */
 193         prep_status("Analyzing all rows in the new cluster");
 194         exec_prog(true,
 195                           SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
 196                           "--all --analyze >> \"%s\" 2>&1" SYSTEMQUOTE,
 197           new_cluster.bindir, new_cluster.port, os_info.user, log_opts.filename2);
 198         check_ok();
 199
 200         /*
 201          * We do freeze after analyze so pg_statistic is also frozen. template0 is
 202          * not frozen here, but data rows were frozen by initdb, and we set its
 203          * datfrozenxid and relfrozenxids later to match the new xid counter
 204          * later.
 205          */
 206         prep_status("Freezing all rows on the new cluster");
 207         exec_prog(true,
 208                           SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
 209                           "--all --freeze >> \"%s\" 2>&1" SYSTEMQUOTE,
 210           new_cluster.bindir, new_cluster.port, os_info.user, log_opts.filename2);
 211         check_ok();
 212
 213         get_pg_database_relfilenode(&new_cluster);
 214 }
 215
 216
 217 static void
 218 prepare_new_databases(void)
 219 {
 220         /*
 221          * We set autovacuum_freeze_max_age to its maximum value so autovacuum
 222          * does not launch here and delete clog files, before the frozen xids are
 223          * set.
 224          */
 225
 226         set_frozenxids();
 227
 228         prep_status("Creating databases in the new cluster");
 229
 230         /*
 231          * Install support functions in the global-restore database to preserve
 232          * pg_authid.oid.
 233          */
 234         install_support_functions_in_new_db(GLOBAL_DUMP_DB);
 235
 236         /*
 237          * We have to create the databases first so we can install support
 238          * functions in all the other databases.  Ideally we could create the
 239          * support functions in template1 but pg_dumpall creates database using
 240          * the template0 template.
 241          */
 242         exec_prog(true,
 243                           SYSTEMQUOTE "\"%s/psql\" --set ON_ERROR_STOP=on "
 244         /* --no-psqlrc prevents AUTOCOMMIT=off */
 245                           "--no-psqlrc --port %d --username \"%s\" "
 246                           "-f \"%s/%s\" --dbname template1 >> \"%s\"" SYSTEMQUOTE,
 247                           new_cluster.bindir, new_cluster.port, os_info.user, os_info.cwd,
 248                           GLOBALS_DUMP_FILE, log_opts.filename2);
 249         check_ok();
 250
 251         /* we load this to get a current list of databases */
 252         get_db_and_rel_infos(&new_cluster);
 253 }
 254
 255
 256 static void
 257 create_new_objects(void)
 258 {
 259         int                     dbnum;
 260
 261         prep_status("Adding support functions to new cluster");
 262
 263         for (dbnum = 0; dbnum < new_cluster.dbarr.ndbs; dbnum++)
 264         {
 265                 DbInfo     *new_db = &new_cluster.dbarr.dbs[dbnum];
 266
 267                 /* skip db we already installed */
 268                 if (strcmp(new_db->db_name, GLOBAL_DUMP_DB) != 0)
 269                         install_support_functions_in_new_db(new_db->db_name);
 270         }
 271         check_ok();
 272
 273         prep_status("Restoring database schema to new cluster");
 274         exec_prog(true,
 275                           SYSTEMQUOTE "\"%s/psql\" --set ON_ERROR_STOP=on "
 276                           "--no-psqlrc --port %d --username \"%s\" "
 277                           "-f \"%s/%s\" --dbname template1 >> \"%s\"" SYSTEMQUOTE,
 278                           new_cluster.bindir, new_cluster.port, os_info.user, os_info.cwd,
 279                           DB_DUMP_FILE, log_opts.filename2);
 280         check_ok();
 281
 282         /* regenerate now that we have objects in the databases */
 283         get_db_and_rel_infos(&new_cluster);
 284
 285         uninstall_support_functions_from_new_cluster();
 286 }
 287
 288
 289 static void
 290 copy_clog_xlog_xid(void)
 291 {
 292         char            old_clog_path[MAXPGPATH];
 293         char            new_clog_path[MAXPGPATH];
 294
 295         /* copy old commit logs to new data dir */
 296         prep_status("Deleting new commit clogs");
 297
 298         snprintf(old_clog_path, sizeof(old_clog_path), "%s/pg_clog", old_cluster.pgdata);
 299         snprintf(new_clog_path, sizeof(new_clog_path), "%s/pg_clog", new_cluster.pgdata);
 300         if (!rmtree(new_clog_path, true))
 301                 pg_log(PG_FATAL, "could not delete directory \"%s\"\n", new_clog_path);
 302         check_ok();
 303
 304         prep_status("Copying old commit clogs to new server");
 305 #ifndef WIN32
 306         exec_prog(true, SYSTEMQUOTE "%s \"%s\" \"%s\"" SYSTEMQUOTE,
 307                           "cp -Rf",
 308 #else
 309         /* flags: everything, no confirm, quiet, overwrite read-only */
 310         exec_prog(true, SYSTEMQUOTE "%s \"%s\" \"%s\\\"" SYSTEMQUOTE,
 311                           "xcopy /e /y /q /r",
 312 #endif
 313                           old_clog_path, new_clog_path);
 314         check_ok();
 315
 316         /* set the next transaction id of the new cluster */
 317         prep_status("Setting next transaction ID for new cluster");
 318         exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -f -x %u \"%s\" > " DEVNULL SYSTEMQUOTE,
 319                           new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid, new_cluster.pgdata);
 320         check_ok();
 321
 322         /* now reset the wal archives in the new cluster */
 323         prep_status("Resetting WAL archives");
 324         exec_prog(true, SYSTEMQUOTE "\"%s/pg_resetxlog\" -l %u,%u,%u \"%s\" >> \"%s\" 2>&1" SYSTEMQUOTE,
 325                           new_cluster.bindir, old_cluster.controldata.chkpnt_tli,
 326                         old_cluster.controldata.logid, old_cluster.controldata.nxtlogseg,
 327                           new_cluster.pgdata, log_opts.filename2);
 328         check_ok();
 329 }
 330
 331
 332 /*
 333  *      set_frozenxids()
 334  *
 335  *      We have frozen all xids, so set relfrozenxid and datfrozenxid
 336  *      to be the old cluster's xid counter, which we just set in the new
 337  *      cluster.  User-table frozenxid values will be set by pg_dumpall
 338  *      --binary-upgrade, but objects not set by the pg_dump must have
 339  *      proper frozen counters.
 340  */
 341 static
 342 void
 343 set_frozenxids(void)
 344 {
 345         int                     dbnum;
 346         PGconn     *conn,
 347                            *conn_template1;
 348         PGresult   *dbres;
 349         int                     ntups;
 350         int                     i_datname;
 351         int                     i_datallowconn;
 352
 353         prep_status("Setting frozenxid counters in new cluster");
 354
 355         conn_template1 = connectToServer(&new_cluster, "template1");
 356
 357         /* set pg_database.datfrozenxid */
 358         PQclear(executeQueryOrDie(conn_template1,
 359                                                           "UPDATE pg_catalog.pg_database "
 360                                                           "SET  datfrozenxid = '%u'",
 361                                                           old_cluster.controldata.chkpnt_nxtxid));
 362
 363         /* get database names */
 364         dbres = executeQueryOrDie(conn_template1,
 365                                                           "SELECT       datname, datallowconn "
 366                                                           "FROM pg_catalog.pg_database");
 367
 368         i_datname = PQfnumber(dbres, "datname");
 369         i_datallowconn = PQfnumber(dbres, "datallowconn");
 370
 371         ntups = PQntuples(dbres);
 372         for (dbnum = 0; dbnum < ntups; dbnum++)
 373         {
 374                 char       *datname = PQgetvalue(dbres, dbnum, i_datname);
 375                 char       *datallowconn = PQgetvalue(dbres, dbnum, i_datallowconn);
 376
 377                 /*
 378                  * We must update databases where datallowconn = false, e.g.
 379                  * template0, because autovacuum increments their datfrozenxids and
 380                  * relfrozenxids even if autovacuum is turned off, and even though all
 381                  * the data rows are already frozen  To enable this, we temporarily
 382                  * change datallowconn.
 383                  */
 384                 if (strcmp(datallowconn, "f") == 0)
 385                         PQclear(executeQueryOrDie(conn_template1,
 386                                                                           "UPDATE pg_catalog.pg_database "
 387                                                                           "SET  datallowconn = true "
 388                                                                           "WHERE datname = '%s'", datname));
 389
 390                 conn = connectToServer(&new_cluster, datname);
 391
 392                 /* set pg_class.relfrozenxid */
 393                 PQclear(executeQueryOrDie(conn,
 394                                                                   "UPDATE       pg_catalog.pg_class "
 395                                                                   "SET  relfrozenxid = '%u' "
 396                 /* only heap and TOAST are vacuumed */
 397                                                                   "WHERE        relkind IN ('r', 't')",
 398                                                                   old_cluster.controldata.chkpnt_nxtxid));
 399                 PQfinish(conn);
 400
 401                 /* Reset datallowconn flag */
 402                 if (strcmp(datallowconn, "f") == 0)
 403                         PQclear(executeQueryOrDie(conn_template1,
 404                                                                           "UPDATE pg_catalog.pg_database "
 405                                                                           "SET  datallowconn = false "
 406                                                                           "WHERE datname = '%s'", datname));
 407         }
 408
 409         PQclear(dbres);
 410
 411         PQfinish(conn_template1);
 412
 413         check_ok();
 414 }
 415
 416
 417 static void
 418 cleanup(void)
 419 {
 420         char            filename[MAXPGPATH];
 421
 422         if (log_opts.fd)
 423                 fclose(log_opts.fd);
 424
 425         if (log_opts.debug_fd)
 426                 fclose(log_opts.debug_fd);
 427
 428         snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, ALL_DUMP_FILE);
 429         unlink(filename);
 430         snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, GLOBALS_DUMP_FILE);
 431         unlink(filename);
 432         snprintf(filename, sizeof(filename), "%s/%s", os_info.cwd, DB_DUMP_FILE);
 433         unlink(filename);
 434 }