Line data Source code
1 : /*
2 : * info.c
3 : *
4 : * information support functions
5 : *
6 : * Copyright (c) 2010-2026, PostgreSQL Global Development Group
7 : * src/bin/pg_upgrade/info.c
8 : */
9 :
10 : #include "postgres_fe.h"
11 :
12 : #include "access/transam.h"
13 : #include "catalog/pg_class_d.h"
14 : #include "pg_upgrade.h"
15 : #include "pqexpbuffer.h"
16 :
17 : static void create_rel_filename_map(const char *old_data, const char *new_data,
18 : const DbInfo *old_db, const DbInfo *new_db,
19 : const RelInfo *old_rel, const RelInfo *new_rel,
20 : FileNameMap *map);
21 : static void report_unmatched_relation(const RelInfo *rel, const DbInfo *db,
22 : bool is_new_db);
23 : static void free_db_and_rel_infos(DbInfoArr *db_arr);
24 : static void get_template0_info(ClusterInfo *cluster);
25 : static void get_db_infos(ClusterInfo *cluster);
26 : static char *get_rel_infos_query(void);
27 : static void process_rel_infos(DbInfo *dbinfo, PGresult *res, void *arg);
28 : static void free_rel_infos(RelInfoArr *rel_arr);
29 : static void print_db_infos(DbInfoArr *db_arr);
30 : static void print_rel_infos(RelInfoArr *rel_arr);
31 : static void print_slot_infos(LogicalSlotInfoArr *slot_arr);
32 : static const char *get_old_cluster_logical_slot_infos_query(ClusterInfo *cluster);
33 : static void process_old_cluster_logical_slot_infos(DbInfo *dbinfo, PGresult *res, void *arg);
34 :
35 :
36 : /*
37 : * gen_db_file_maps()
38 : *
39 : * generates a database mapping from "old_db" to "new_db".
40 : *
41 : * Returns a malloc'ed array of mappings. The length of the array
42 : * is returned into *nmaps.
43 : */
44 : FileNameMap *
45 30 : gen_db_file_maps(DbInfo *old_db, DbInfo *new_db,
46 : int *nmaps,
47 : const char *old_pgdata, const char *new_pgdata)
48 : {
49 : FileNameMap *maps;
50 : int old_relnum,
51 : new_relnum;
52 30 : int num_maps = 0;
53 30 : bool all_matched = true;
54 :
55 : /* There will certainly not be more mappings than there are old rels */
56 30 : maps = (FileNameMap *) pg_malloc(sizeof(FileNameMap) *
57 30 : old_db->rel_arr.nrels);
58 :
59 : /*
60 : * Each of the RelInfo arrays should be sorted by OID. Scan through them
61 : * and match them up. If we fail to match everything, we'll abort, but
62 : * first print as much info as we can about mismatches.
63 : */
64 30 : old_relnum = new_relnum = 0;
65 1622 : while (old_relnum < old_db->rel_arr.nrels ||
66 30 : new_relnum < new_db->rel_arr.nrels)
67 : {
68 3184 : RelInfo *old_rel = (old_relnum < old_db->rel_arr.nrels) ?
69 1592 : &old_db->rel_arr.rels[old_relnum] : NULL;
70 3184 : RelInfo *new_rel = (new_relnum < new_db->rel_arr.nrels) ?
71 1592 : &new_db->rel_arr.rels[new_relnum] : NULL;
72 :
73 : /* handle running off one array before the other */
74 1592 : if (!new_rel)
75 : {
76 : /*
77 : * old_rel is unmatched. This should never happen, because we
78 : * force new rels to have TOAST tables if the old one did.
79 : */
80 0 : report_unmatched_relation(old_rel, old_db, false);
81 0 : all_matched = false;
82 0 : old_relnum++;
83 0 : continue;
84 : }
85 1592 : if (!old_rel)
86 : {
87 : /*
88 : * new_rel is unmatched. This shouldn't really happen either, but
89 : * if it's a TOAST table, we can ignore it and continue
90 : * processing, assuming that the new server made a TOAST table
91 : * that wasn't needed.
92 : */
93 0 : if (strcmp(new_rel->nspname, "pg_toast") != 0)
94 : {
95 0 : report_unmatched_relation(new_rel, new_db, true);
96 0 : all_matched = false;
97 : }
98 0 : new_relnum++;
99 0 : continue;
100 : }
101 :
102 : /* check for mismatched OID */
103 1592 : if (old_rel->reloid < new_rel->reloid)
104 : {
105 : /* old_rel is unmatched, see comment above */
106 0 : report_unmatched_relation(old_rel, old_db, false);
107 0 : all_matched = false;
108 0 : old_relnum++;
109 0 : continue;
110 : }
111 1592 : else if (old_rel->reloid > new_rel->reloid)
112 : {
113 : /* new_rel is unmatched, see comment above */
114 0 : if (strcmp(new_rel->nspname, "pg_toast") != 0)
115 : {
116 0 : report_unmatched_relation(new_rel, new_db, true);
117 0 : all_matched = false;
118 : }
119 0 : new_relnum++;
120 0 : continue;
121 : }
122 :
123 : /*
124 : * Verify that rels of same OID have same name. The namespace name
125 : * should always match, but the relname might not match for TOAST
126 : * tables (and, therefore, their indexes).
127 : */
128 1592 : if (strcmp(old_rel->nspname, new_rel->nspname) != 0 ||
129 1592 : strcmp(old_rel->relname, new_rel->relname) != 0)
130 : {
131 0 : pg_log(PG_WARNING, "Relation names for OID %u in database \"%s\" do not match: "
132 : "old name \"%s.%s\", new name \"%s.%s\"",
133 : old_rel->reloid, old_db->db_name,
134 : old_rel->nspname, old_rel->relname,
135 : new_rel->nspname, new_rel->relname);
136 0 : all_matched = false;
137 0 : old_relnum++;
138 0 : new_relnum++;
139 0 : continue;
140 : }
141 :
142 : /* OK, create a mapping entry */
143 1592 : create_rel_filename_map(old_pgdata, new_pgdata, old_db, new_db,
144 1592 : old_rel, new_rel, maps + num_maps);
145 1592 : num_maps++;
146 1592 : old_relnum++;
147 1592 : new_relnum++;
148 : }
149 :
150 30 : if (!all_matched)
151 0 : pg_fatal("Failed to match up old and new tables in database \"%s\"",
152 : old_db->db_name);
153 :
154 30 : *nmaps = num_maps;
155 30 : return maps;
156 : }
157 :
158 :
159 : /*
160 : * create_rel_filename_map()
161 : *
162 : * fills a file node map structure and returns it in "map".
163 : */
164 : static void
165 1592 : create_rel_filename_map(const char *old_data, const char *new_data,
166 : const DbInfo *old_db, const DbInfo *new_db,
167 : const RelInfo *old_rel, const RelInfo *new_rel,
168 : FileNameMap *map)
169 : {
170 : /* In case old/new tablespaces don't match, do them separately. */
171 1592 : if (strlen(old_rel->tablespace) == 0)
172 : {
173 : /*
174 : * relation belongs to the default tablespace, hence relfiles should
175 : * exist in the data directories.
176 : */
177 1568 : map->old_tablespace = old_data;
178 1568 : map->old_tablespace_suffix = "/base";
179 : }
180 : else
181 : {
182 : /* relation belongs to a tablespace, so use the tablespace location */
183 24 : map->old_tablespace = old_rel->tablespace;
184 24 : map->old_tablespace_suffix = old_cluster.tablespace_suffix;
185 : }
186 :
187 : /* Do the same for new tablespaces */
188 1592 : if (strlen(new_rel->tablespace) == 0)
189 : {
190 1568 : map->new_tablespace = new_data;
191 1568 : map->new_tablespace_suffix = "/base";
192 : }
193 : else
194 : {
195 24 : map->new_tablespace = new_rel->tablespace;
196 24 : map->new_tablespace_suffix = new_cluster.tablespace_suffix;
197 : }
198 :
199 : /* DB oid and relfilenumbers are preserved between old and new cluster */
200 1592 : map->db_oid = old_db->db_oid;
201 1592 : map->relfilenumber = old_rel->relfilenumber;
202 :
203 : /* used only for logging and error reporting, old/new are identical */
204 1592 : map->nspname = old_rel->nspname;
205 1592 : map->relname = old_rel->relname;
206 1592 : }
207 :
208 :
209 : /*
210 : * Complain about a relation we couldn't match to the other database,
211 : * identifying it as best we can.
212 : */
213 : static void
214 0 : report_unmatched_relation(const RelInfo *rel, const DbInfo *db, bool is_new_db)
215 : {
216 0 : Oid reloid = rel->reloid; /* we might change rel below */
217 : char reldesc[1000];
218 : int i;
219 :
220 0 : snprintf(reldesc, sizeof(reldesc), "\"%s.%s\"",
221 0 : rel->nspname, rel->relname);
222 0 : if (rel->indtable)
223 : {
224 0 : for (i = 0; i < db->rel_arr.nrels; i++)
225 : {
226 0 : const RelInfo *hrel = &db->rel_arr.rels[i];
227 :
228 0 : if (hrel->reloid == rel->indtable)
229 : {
230 0 : snprintf(reldesc + strlen(reldesc),
231 0 : sizeof(reldesc) - strlen(reldesc),
232 0 : _(" which is an index on \"%s.%s\""),
233 0 : hrel->nspname, hrel->relname);
234 : /* Shift attention to index's table for toast check */
235 0 : rel = hrel;
236 0 : break;
237 : }
238 : }
239 0 : if (i >= db->rel_arr.nrels)
240 0 : snprintf(reldesc + strlen(reldesc),
241 0 : sizeof(reldesc) - strlen(reldesc),
242 0 : _(" which is an index on OID %u"), rel->indtable);
243 : }
244 0 : if (rel->toastheap)
245 : {
246 0 : for (i = 0; i < db->rel_arr.nrels; i++)
247 : {
248 0 : const RelInfo *brel = &db->rel_arr.rels[i];
249 :
250 0 : if (brel->reloid == rel->toastheap)
251 : {
252 0 : snprintf(reldesc + strlen(reldesc),
253 0 : sizeof(reldesc) - strlen(reldesc),
254 0 : _(" which is the TOAST table for \"%s.%s\""),
255 0 : brel->nspname, brel->relname);
256 0 : break;
257 : }
258 : }
259 0 : if (i >= db->rel_arr.nrels)
260 0 : snprintf(reldesc + strlen(reldesc),
261 0 : sizeof(reldesc) - strlen(reldesc),
262 0 : _(" which is the TOAST table for OID %u"), rel->toastheap);
263 : }
264 :
265 0 : if (is_new_db)
266 0 : pg_log(PG_WARNING, "No match found in old cluster for new relation with OID %u in database \"%s\": %s",
267 0 : reloid, db->db_name, reldesc);
268 : else
269 0 : pg_log(PG_WARNING, "No match found in new cluster for old relation with OID %u in database \"%s\": %s",
270 0 : reloid, db->db_name, reldesc);
271 0 : }
272 :
273 : /*
274 : * get_db_rel_and_slot_infos()
275 : *
276 : * higher level routine to generate dbinfos for the database running
277 : * on the given "port". Assumes that server is already running.
278 : */
279 : void
280 39 : get_db_rel_and_slot_infos(ClusterInfo *cluster)
281 : {
282 39 : UpgradeTask *task = upgrade_task_create();
283 39 : char *rel_infos_query = NULL;
284 :
285 39 : if (cluster->dbarr.dbs != NULL)
286 9 : free_db_and_rel_infos(&cluster->dbarr);
287 :
288 39 : get_template0_info(cluster);
289 39 : get_db_infos(cluster);
290 :
291 39 : rel_infos_query = get_rel_infos_query();
292 39 : upgrade_task_add_step(task,
293 : rel_infos_query,
294 : process_rel_infos,
295 : true, NULL);
296 :
297 : /*
298 : * Logical slots are only carried over to the new cluster when the old
299 : * cluster is on PG17 or newer. This is because before that the logical
300 : * slots are not saved at shutdown, so there is no guarantee that the
301 : * latest confirmed_flush_lsn is saved to disk which can lead to data
302 : * loss. It is still not guaranteed for manually created slots in PG17, so
303 : * subsequent checks done in check_old_cluster_for_valid_slots() would
304 : * raise a FATAL error if such slots are included.
305 : */
306 39 : if (cluster == &old_cluster &&
307 16 : GET_MAJOR_VERSION(cluster->major_version) > 1600)
308 16 : upgrade_task_add_step(task,
309 : get_old_cluster_logical_slot_infos_query(cluster),
310 : process_old_cluster_logical_slot_infos,
311 : true, NULL);
312 :
313 39 : upgrade_task_run(task, cluster);
314 39 : upgrade_task_free(task);
315 :
316 39 : pg_free(rel_infos_query);
317 :
318 39 : if (cluster == &old_cluster)
319 16 : pg_log(PG_VERBOSE, "\nsource databases:");
320 : else
321 23 : pg_log(PG_VERBOSE, "\ntarget databases:");
322 :
323 39 : if (log_opts.verbose)
324 0 : print_db_infos(&cluster->dbarr);
325 39 : }
326 :
327 :
328 : /*
329 : * Get information about template0, which will be copied from the old cluster
330 : * to the new cluster.
331 : */
332 : static void
333 39 : get_template0_info(ClusterInfo *cluster)
334 : {
335 39 : PGconn *conn = connectToServer(cluster, "template1");
336 : DbLocaleInfo *locale;
337 : PGresult *dbres;
338 : int i_datencoding;
339 : int i_datlocprovider;
340 : int i_datcollate;
341 : int i_datctype;
342 : int i_datlocale;
343 :
344 39 : if (GET_MAJOR_VERSION(cluster->major_version) >= 1700)
345 39 : dbres = executeQueryOrDie(conn,
346 : "SELECT encoding, datlocprovider, "
347 : " datcollate, datctype, datlocale "
348 : "FROM pg_catalog.pg_database "
349 : "WHERE datname='template0'");
350 0 : else if (GET_MAJOR_VERSION(cluster->major_version) >= 1500)
351 0 : dbres = executeQueryOrDie(conn,
352 : "SELECT encoding, datlocprovider, "
353 : " datcollate, datctype, daticulocale AS datlocale "
354 : "FROM pg_catalog.pg_database "
355 : "WHERE datname='template0'");
356 : else
357 0 : dbres = executeQueryOrDie(conn,
358 : "SELECT encoding, 'c' AS datlocprovider, "
359 : " datcollate, datctype, NULL AS datlocale "
360 : "FROM pg_catalog.pg_database "
361 : "WHERE datname='template0'");
362 :
363 :
364 39 : if (PQntuples(dbres) != 1)
365 0 : pg_fatal("template0 not found");
366 :
367 39 : locale = pg_malloc(sizeof(DbLocaleInfo));
368 :
369 39 : i_datencoding = PQfnumber(dbres, "encoding");
370 39 : i_datlocprovider = PQfnumber(dbres, "datlocprovider");
371 39 : i_datcollate = PQfnumber(dbres, "datcollate");
372 39 : i_datctype = PQfnumber(dbres, "datctype");
373 39 : i_datlocale = PQfnumber(dbres, "datlocale");
374 :
375 39 : locale->db_encoding = atoi(PQgetvalue(dbres, 0, i_datencoding));
376 39 : locale->db_collprovider = PQgetvalue(dbres, 0, i_datlocprovider)[0];
377 39 : locale->db_collate = pg_strdup(PQgetvalue(dbres, 0, i_datcollate));
378 39 : locale->db_ctype = pg_strdup(PQgetvalue(dbres, 0, i_datctype));
379 39 : if (PQgetisnull(dbres, 0, i_datlocale))
380 36 : locale->db_locale = NULL;
381 : else
382 3 : locale->db_locale = pg_strdup(PQgetvalue(dbres, 0, i_datlocale));
383 :
384 39 : cluster->template0 = locale;
385 :
386 39 : PQclear(dbres);
387 39 : PQfinish(conn);
388 39 : }
389 :
390 :
391 : /*
392 : * get_db_infos()
393 : *
394 : * Scans pg_database system catalog and populates all user
395 : * databases.
396 : */
397 : static void
398 39 : get_db_infos(ClusterInfo *cluster)
399 : {
400 39 : PGconn *conn = connectToServer(cluster, "template1");
401 : PGresult *res;
402 : int ntups;
403 : int tupnum;
404 : DbInfo *dbinfos;
405 : int i_datname,
406 : i_oid,
407 : i_spclocation;
408 : char query[QUERY_ALLOC];
409 :
410 39 : snprintf(query, sizeof(query),
411 : "SELECT d.oid, d.datname, d.encoding, d.datcollate, d.datctype, ");
412 39 : if (GET_MAJOR_VERSION(cluster->major_version) >= 1700)
413 39 : snprintf(query + strlen(query), sizeof(query) - strlen(query),
414 : "datlocprovider, datlocale, ");
415 0 : else if (GET_MAJOR_VERSION(cluster->major_version) >= 1500)
416 0 : snprintf(query + strlen(query), sizeof(query) - strlen(query),
417 : "datlocprovider, daticulocale AS datlocale, ");
418 : else
419 0 : snprintf(query + strlen(query), sizeof(query) - strlen(query),
420 : "'c' AS datlocprovider, NULL AS datlocale, ");
421 39 : snprintf(query + strlen(query), sizeof(query) - strlen(query),
422 : "pg_catalog.pg_tablespace_location(t.oid) AS spclocation "
423 : "FROM pg_catalog.pg_database d "
424 : " LEFT OUTER JOIN pg_catalog.pg_tablespace t "
425 : " ON d.dattablespace = t.oid "
426 : "WHERE d.datallowconn = true "
427 : "ORDER BY 1");
428 :
429 39 : res = executeQueryOrDie(conn, "%s", query);
430 :
431 39 : i_oid = PQfnumber(res, "oid");
432 39 : i_datname = PQfnumber(res, "datname");
433 39 : i_spclocation = PQfnumber(res, "spclocation");
434 :
435 39 : ntups = PQntuples(res);
436 39 : dbinfos = (DbInfo *) pg_malloc0(sizeof(DbInfo) * ntups);
437 :
438 147 : for (tupnum = 0; tupnum < ntups; tupnum++)
439 : {
440 108 : char *spcloc = PQgetvalue(res, tupnum, i_spclocation);
441 108 : bool inplace = spcloc[0] && !is_absolute_path(spcloc);
442 :
443 108 : dbinfos[tupnum].db_oid = atooid(PQgetvalue(res, tupnum, i_oid));
444 108 : dbinfos[tupnum].db_name = pg_strdup(PQgetvalue(res, tupnum, i_datname));
445 :
446 : /*
447 : * The tablespace location might be "", meaning the cluster default
448 : * location, i.e. pg_default or pg_global. For in-place tablespaces,
449 : * pg_tablespace_location() returns a path relative to the data
450 : * directory.
451 : */
452 108 : if (inplace)
453 9 : snprintf(dbinfos[tupnum].db_tablespace,
454 : sizeof(dbinfos[tupnum].db_tablespace),
455 : "%s/%s", cluster->pgdata, spcloc);
456 : else
457 99 : snprintf(dbinfos[tupnum].db_tablespace,
458 : sizeof(dbinfos[tupnum].db_tablespace),
459 : "%s", spcloc);
460 : }
461 39 : PQclear(res);
462 :
463 39 : PQfinish(conn);
464 :
465 39 : cluster->dbarr.dbs = dbinfos;
466 39 : cluster->dbarr.ndbs = ntups;
467 39 : }
468 :
469 :
470 : /*
471 : * get_rel_infos_query()
472 : *
473 : * Returns the query for retrieving the relation information for all the user
474 : * tables and indexes in the database, for use by get_db_rel_and_slot_infos()'s
475 : * UpgradeTask.
476 : *
477 : * Note: the result is assumed to be sorted by OID. This allows later
478 : * processing to match up old and new databases efficiently.
479 : */
480 : static char *
481 39 : get_rel_infos_query(void)
482 : {
483 : PQExpBufferData query;
484 :
485 39 : initPQExpBuffer(&query);
486 :
487 : /*
488 : * Create a CTE that collects OIDs of regular user tables and matviews,
489 : * but excluding toast tables and indexes. We assume that relations with
490 : * OIDs >= FirstNormalObjectId belong to the user. (That's probably
491 : * redundant with the namespace-name exclusions, but let's be safe.)
492 : *
493 : * pg_largeobject contains user data that does not appear in pg_dump
494 : * output, so we have to copy that system table. It's easiest to do that
495 : * by treating it as a user table. We can do the same for
496 : * pg_largeobject_metadata for upgrades from v16 and newer. pg_upgrade
497 : * can't copy/link the files from older versions because aclitem (needed
498 : * by pg_largeobject_metadata.lomacl) changed its storage format in v16.
499 : */
500 78 : appendPQExpBuffer(&query,
501 : "WITH regular_heap (reloid, indtable, toastheap) AS ( "
502 : " SELECT c.oid, 0::oid, 0::oid "
503 : " FROM pg_catalog.pg_class c JOIN pg_catalog.pg_namespace n "
504 : " ON c.relnamespace = n.oid "
505 : " WHERE relkind IN (" CppAsString2(RELKIND_RELATION) ", "
506 : CppAsString2(RELKIND_MATVIEW) "%s) AND "
507 : /* exclude possible orphaned temp tables */
508 : " ((n.nspname !~ '^pg_temp_' AND "
509 : " n.nspname !~ '^pg_toast_temp_' AND "
510 : " n.nspname NOT IN ('pg_catalog', 'information_schema', "
511 : " 'binary_upgrade', 'pg_toast') AND "
512 : " c.oid >= %u::pg_catalog.oid) OR "
513 : " (n.nspname = 'pg_catalog' AND "
514 : " relname IN ('pg_largeobject'%s) ))), ",
515 39 : (user_opts.transfer_mode == TRANSFER_MODE_SWAP) ?
516 : ", " CppAsString2(RELKIND_SEQUENCE) : "",
517 : FirstNormalObjectId,
518 39 : (GET_MAJOR_VERSION(old_cluster.major_version) >= 1600) ?
519 : ", 'pg_largeobject_metadata'" : "");
520 :
521 : /*
522 : * Add a CTE that collects OIDs of toast tables belonging to the tables
523 : * selected by the regular_heap CTE. (We have to do this separately
524 : * because the namespace-name rules above don't work for toast tables.)
525 : */
526 39 : appendPQExpBufferStr(&query,
527 : " toast_heap (reloid, indtable, toastheap) AS ( "
528 : " SELECT c.reltoastrelid, 0::oid, c.oid "
529 : " FROM regular_heap JOIN pg_catalog.pg_class c "
530 : " ON regular_heap.reloid = c.oid "
531 : " WHERE c.reltoastrelid != 0), ");
532 :
533 : /*
534 : * Add a CTE that collects OIDs of all valid indexes on the previously
535 : * selected tables. We can ignore invalid indexes since pg_dump does.
536 : * Testing indisready is necessary in 9.2, and harmless in earlier/later
537 : * versions.
538 : */
539 39 : appendPQExpBufferStr(&query,
540 : " all_index (reloid, indtable, toastheap) AS ( "
541 : " SELECT indexrelid, indrelid, 0::oid "
542 : " FROM pg_catalog.pg_index "
543 : " WHERE indisvalid AND indisready "
544 : " AND indrelid IN "
545 : " (SELECT reloid FROM regular_heap "
546 : " UNION ALL "
547 : " SELECT reloid FROM toast_heap)) ");
548 :
549 : /*
550 : * And now we can write the query that retrieves the data we want for each
551 : * heap and index relation. Make sure result is sorted by OID.
552 : */
553 39 : appendPQExpBufferStr(&query,
554 : "SELECT all_rels.*, n.nspname, c.relname, "
555 : " c.relfilenode, c.reltablespace, "
556 : " pg_catalog.pg_tablespace_location(t.oid) AS spclocation "
557 : "FROM (SELECT * FROM regular_heap "
558 : " UNION ALL "
559 : " SELECT * FROM toast_heap "
560 : " UNION ALL "
561 : " SELECT * FROM all_index) all_rels "
562 : " JOIN pg_catalog.pg_class c "
563 : " ON all_rels.reloid = c.oid "
564 : " JOIN pg_catalog.pg_namespace n "
565 : " ON c.relnamespace = n.oid "
566 : " LEFT OUTER JOIN pg_catalog.pg_tablespace t "
567 : " ON c.reltablespace = t.oid "
568 : "ORDER BY 1");
569 :
570 39 : return query.data;
571 : }
572 :
573 : /*
574 : * Callback function for processing results of the query returned by
575 : * get_rel_infos_query(), which is used for get_db_rel_and_slot_infos()'s
576 : * UpgradeTask. This function stores the relation information for later use.
577 : */
578 : static void
579 108 : process_rel_infos(DbInfo *dbinfo, PGresult *res, void *arg)
580 : {
581 108 : int ntups = PQntuples(res);
582 108 : RelInfo *relinfos = (RelInfo *) pg_malloc(sizeof(RelInfo) * ntups);
583 108 : int i_reloid = PQfnumber(res, "reloid");
584 108 : int i_indtable = PQfnumber(res, "indtable");
585 108 : int i_toastheap = PQfnumber(res, "toastheap");
586 108 : int i_nspname = PQfnumber(res, "nspname");
587 108 : int i_relname = PQfnumber(res, "relname");
588 108 : int i_relfilenumber = PQfnumber(res, "relfilenode");
589 108 : int i_reltablespace = PQfnumber(res, "reltablespace");
590 108 : int i_spclocation = PQfnumber(res, "spclocation");
591 108 : int num_rels = 0;
592 108 : char *nspname = NULL;
593 108 : char *relname = NULL;
594 108 : char *tablespace = NULL;
595 108 : char *last_namespace = NULL;
596 108 : char *last_tablespace = NULL;
597 :
598 4940 : for (int relnum = 0; relnum < ntups; relnum++)
599 : {
600 4832 : RelInfo *curr = &relinfos[num_rels++];
601 :
602 4832 : curr->reloid = atooid(PQgetvalue(res, relnum, i_reloid));
603 4832 : curr->indtable = atooid(PQgetvalue(res, relnum, i_indtable));
604 4832 : curr->toastheap = atooid(PQgetvalue(res, relnum, i_toastheap));
605 :
606 4832 : nspname = PQgetvalue(res, relnum, i_nspname);
607 4832 : curr->nsp_alloc = false;
608 :
609 : /*
610 : * Many of the namespace and tablespace strings are identical, so we
611 : * try to reuse the allocated string pointers where possible to reduce
612 : * memory consumption.
613 : */
614 : /* Can we reuse the previous string allocation? */
615 4832 : if (last_namespace && strcmp(nspname, last_namespace) == 0)
616 2979 : curr->nspname = last_namespace;
617 : else
618 : {
619 1853 : last_namespace = curr->nspname = pg_strdup(nspname);
620 1853 : curr->nsp_alloc = true;
621 : }
622 :
623 4832 : relname = PQgetvalue(res, relnum, i_relname);
624 4832 : curr->relname = pg_strdup(relname);
625 :
626 4832 : curr->relfilenumber = atooid(PQgetvalue(res, relnum, i_relfilenumber));
627 4832 : curr->tblsp_alloc = false;
628 :
629 : /* Is the tablespace oid non-default? */
630 4832 : if (atooid(PQgetvalue(res, relnum, i_reltablespace)) != 0)
631 : {
632 9 : char *spcloc = PQgetvalue(res, relnum, i_spclocation);
633 9 : bool inplace = spcloc[0] && !is_absolute_path(spcloc);
634 :
635 : /*
636 : * The tablespace location might be "", meaning the cluster
637 : * default location, i.e. pg_default or pg_global. For in-place
638 : * tablespaces, pg_tablespace_location() returns a path relative
639 : * to the data directory.
640 : */
641 9 : if (inplace)
642 9 : tablespace = psprintf("%s/%s",
643 9 : os_info.running_cluster->pgdata,
644 : spcloc);
645 : else
646 0 : tablespace = spcloc;
647 :
648 : /* Can we reuse the previous string allocation? */
649 9 : if (last_tablespace && strcmp(tablespace, last_tablespace) == 0)
650 0 : curr->tablespace = last_tablespace;
651 : else
652 : {
653 9 : last_tablespace = curr->tablespace = pg_strdup(tablespace);
654 9 : curr->tblsp_alloc = true;
655 : }
656 :
657 : /* Free palloc'd string for in-place tablespaces. */
658 9 : if (inplace)
659 9 : pfree(tablespace);
660 : }
661 : else
662 : /* A zero reltablespace oid indicates the database tablespace. */
663 4823 : curr->tablespace = dbinfo->db_tablespace;
664 : }
665 :
666 108 : dbinfo->rel_arr.rels = relinfos;
667 108 : dbinfo->rel_arr.nrels = num_rels;
668 108 : }
669 :
670 : /*
671 : * get_old_cluster_logical_slot_infos_query()
672 : *
673 : * Returns the query for retrieving the logical slot information for all the
674 : * logical replication slots in the database, for use by
675 : * get_db_rel_and_slot_infos()'s UpgradeTask. The status of each logical slot
676 : * is checked in check_old_cluster_for_valid_slots().
677 : */
678 : static const char *
679 16 : get_old_cluster_logical_slot_infos_query(ClusterInfo *cluster)
680 : {
681 : /*
682 : * Fetch the logical replication slot information. The check whether the
683 : * slot is considered caught up is done by an upgrade function. This
684 : * regards the slot as caught up if we don't find any decodable changes.
685 : * The implementation of this check varies depending on the server
686 : * version.
687 : *
688 : * We intentionally skip checking the WALs for invalidated slots as the
689 : * corresponding WALs could have been removed for such slots.
690 : *
691 : * The temporary slots are explicitly ignored while checking because such
692 : * slots cannot exist after the upgrade. During the upgrade, clusters are
693 : * started and stopped several times causing any temporary slots to be
694 : * removed.
695 : */
696 :
697 16 : if (user_opts.live_check)
698 : {
699 : /*
700 : * We skip the caught-up check during live_check. We cannot verify
701 : * whether the slot is caught up in this mode, as new WAL records
702 : * could be generated concurrently.
703 : */
704 0 : return "SELECT slot_name, plugin, two_phase, failover, "
705 : "FALSE as caught_up, "
706 : "invalidation_reason IS NOT NULL as invalid "
707 : "FROM pg_catalog.pg_replication_slots "
708 : "WHERE slot_type = 'logical' AND "
709 : "database = current_database() AND "
710 : "temporary IS FALSE";
711 : }
712 16 : else if (GET_MAJOR_VERSION(cluster->major_version) >= 1900)
713 : {
714 : /*
715 : * For PG19 and later, we optimize the slot caught-up check to avoid
716 : * reading the same WAL stream multiple times: execute the caught-up
717 : * check only for the slot with the minimum confirmed_flush_lsn, and
718 : * apply the same result to all other slots in the same database. This
719 : * limits the check to at most one logical slot per database. We also
720 : * use the maximum confirmed_flush_lsn among all logical slots on the
721 : * database as an early scan cutoff; finding a decodable WAL record
722 : * beyond this point implies that no slot has caught up.
723 : *
724 : * Note that we don't distinguish slots based on their output plugin.
725 : * If a plugin applies replication origin filters, we might get a
726 : * false positive (i.e., erroneously considering a slot caught up).
727 : * However, such cases are very rare, and the impact of a false
728 : * positive is minimal.
729 : */
730 16 : return "WITH check_caught_up AS ( "
731 : " SELECT pg_catalog.binary_upgrade_check_logical_slot_pending_wal(slot_name, "
732 : " MAX(confirmed_flush_lsn) OVER ()) as last_pending_wal "
733 : " FROM pg_replication_slots "
734 : " WHERE slot_type = 'logical' AND "
735 : " database = current_database() AND "
736 : " temporary IS FALSE AND "
737 : " invalidation_reason IS NULL "
738 : " ORDER BY confirmed_flush_lsn ASC "
739 : " LIMIT 1 "
740 : ") "
741 : "SELECT slot_name, plugin, two_phase, failover, "
742 : "CASE WHEN invalidation_reason IS NOT NULL THEN FALSE "
743 : "ELSE last_pending_wal IS NULL OR "
744 : " confirmed_flush_lsn > last_pending_wal "
745 : "END as caught_up, "
746 : "invalidation_reason IS NOT NULL as invalid "
747 : "FROM pg_catalog.pg_replication_slots, check_caught_up "
748 : "WHERE slot_type = 'logical' AND "
749 : "database = current_database() AND "
750 : "temporary IS FALSE ";
751 : }
752 :
753 : /*
754 : * For PG18 and earlier, we call
755 : * binary_upgrade_logical_slot_has_caught_up() for each logical slot.
756 : */
757 0 : return "SELECT slot_name, plugin, two_phase, failover, "
758 : "CASE WHEN invalidation_reason IS NOT NULL THEN FALSE "
759 : "ELSE (SELECT pg_catalog.binary_upgrade_logical_slot_has_caught_up(slot_name)) "
760 : "END as caught_up, "
761 : "invalidation_reason IS NOT NULL as invalid "
762 : "FROM pg_catalog.pg_replication_slots "
763 : "WHERE slot_type = 'logical' AND "
764 : "database = current_database() AND "
765 : "temporary IS FALSE ";
766 : }
767 :
768 : /*
769 : * Callback function for processing results of the query, which is used for
770 : * get_db_rel_and_slot_infos()'s UpgradeTask. This function stores the logical
771 : * slot information for later use.
772 : */
773 : static void
774 50 : process_old_cluster_logical_slot_infos(DbInfo *dbinfo, PGresult *res, void *arg)
775 : {
776 50 : LogicalSlotInfo *slotinfos = NULL;
777 50 : int num_slots = PQntuples(res);
778 :
779 50 : if (num_slots)
780 : {
781 : int i_slotname;
782 : int i_plugin;
783 : int i_twophase;
784 : int i_failover;
785 : int i_caught_up;
786 : int i_invalid;
787 :
788 3 : slotinfos = (LogicalSlotInfo *) pg_malloc(sizeof(LogicalSlotInfo) * num_slots);
789 :
790 3 : i_slotname = PQfnumber(res, "slot_name");
791 3 : i_plugin = PQfnumber(res, "plugin");
792 3 : i_twophase = PQfnumber(res, "two_phase");
793 3 : i_failover = PQfnumber(res, "failover");
794 3 : i_caught_up = PQfnumber(res, "caught_up");
795 3 : i_invalid = PQfnumber(res, "invalid");
796 :
797 10 : for (int slotnum = 0; slotnum < num_slots; slotnum++)
798 : {
799 7 : LogicalSlotInfo *curr = &slotinfos[slotnum];
800 :
801 7 : curr->slotname = pg_strdup(PQgetvalue(res, slotnum, i_slotname));
802 7 : curr->plugin = pg_strdup(PQgetvalue(res, slotnum, i_plugin));
803 7 : curr->two_phase = (strcmp(PQgetvalue(res, slotnum, i_twophase), "t") == 0);
804 7 : curr->failover = (strcmp(PQgetvalue(res, slotnum, i_failover), "t") == 0);
805 7 : curr->caught_up = (strcmp(PQgetvalue(res, slotnum, i_caught_up), "t") == 0);
806 7 : curr->invalid = (strcmp(PQgetvalue(res, slotnum, i_invalid), "t") == 0);
807 : }
808 : }
809 :
810 50 : dbinfo->slot_arr.slots = slotinfos;
811 50 : dbinfo->slot_arr.nslots = num_slots;
812 50 : }
813 :
814 :
815 : /*
816 : * count_old_cluster_logical_slots()
817 : *
818 : * Returns the number of logical replication slots for all databases.
819 : *
820 : * Note: this function always returns 0 if the old_cluster is PG16 and prior
821 : * because we gather slot information only for cluster versions greater than or
822 : * equal to PG17. See get_db_rel_and_slot_infos().
823 : */
824 : int
825 38 : count_old_cluster_logical_slots(void)
826 : {
827 38 : int slot_count = 0;
828 :
829 160 : for (int dbnum = 0; dbnum < old_cluster.dbarr.ndbs; dbnum++)
830 122 : slot_count += old_cluster.dbarr.dbs[dbnum].slot_arr.nslots;
831 :
832 38 : return slot_count;
833 : }
834 :
835 : /*
836 : * get_subscription_info()
837 : *
838 : * Gets the information of subscriptions in the cluster.
839 : */
840 : void
841 15 : get_subscription_info(ClusterInfo *cluster)
842 : {
843 : PGconn *conn;
844 : PGresult *res;
845 : int i_nsub;
846 : int i_retain_dead_tuples;
847 :
848 15 : conn = connectToServer(cluster, "template1");
849 15 : if (GET_MAJOR_VERSION(cluster->major_version) >= 1900)
850 15 : res = executeQueryOrDie(conn, "SELECT count(*) AS nsub,"
851 : "COUNT(CASE WHEN subretaindeadtuples THEN 1 END) > 0 AS retain_dead_tuples "
852 : "FROM pg_catalog.pg_subscription");
853 : else
854 0 : res = executeQueryOrDie(conn, "SELECT count(*) AS nsub,"
855 : "'f' AS retain_dead_tuples "
856 : "FROM pg_catalog.pg_subscription");
857 :
858 15 : i_nsub = PQfnumber(res, "nsub");
859 15 : i_retain_dead_tuples = PQfnumber(res, "retain_dead_tuples");
860 :
861 15 : cluster->nsubs = atoi(PQgetvalue(res, 0, i_nsub));
862 15 : cluster->sub_retain_dead_tuples = (strcmp(PQgetvalue(res, 0, i_retain_dead_tuples), "t") == 0);
863 :
864 15 : PQclear(res);
865 15 : PQfinish(conn);
866 15 : }
867 :
868 : static void
869 9 : free_db_and_rel_infos(DbInfoArr *db_arr)
870 : {
871 : int dbnum;
872 :
873 27 : for (dbnum = 0; dbnum < db_arr->ndbs; dbnum++)
874 : {
875 18 : free_rel_infos(&db_arr->dbs[dbnum].rel_arr);
876 18 : pg_free(db_arr->dbs[dbnum].db_name);
877 : }
878 9 : pg_free(db_arr->dbs);
879 9 : db_arr->dbs = NULL;
880 9 : db_arr->ndbs = 0;
881 9 : }
882 :
883 :
884 : static void
885 18 : free_rel_infos(RelInfoArr *rel_arr)
886 : {
887 : int relnum;
888 :
889 90 : for (relnum = 0; relnum < rel_arr->nrels; relnum++)
890 : {
891 72 : if (rel_arr->rels[relnum].nsp_alloc)
892 18 : pg_free(rel_arr->rels[relnum].nspname);
893 72 : pg_free(rel_arr->rels[relnum].relname);
894 72 : if (rel_arr->rels[relnum].tblsp_alloc)
895 0 : pg_free(rel_arr->rels[relnum].tablespace);
896 : }
897 18 : pg_free(rel_arr->rels);
898 18 : rel_arr->nrels = 0;
899 18 : }
900 :
901 :
902 : static void
903 0 : print_db_infos(DbInfoArr *db_arr)
904 : {
905 : int dbnum;
906 :
907 0 : for (dbnum = 0; dbnum < db_arr->ndbs; dbnum++)
908 : {
909 0 : DbInfo *pDbInfo = &db_arr->dbs[dbnum];
910 :
911 0 : pg_log(PG_VERBOSE, "Database: \"%s\"", pDbInfo->db_name);
912 0 : print_rel_infos(&pDbInfo->rel_arr);
913 0 : print_slot_infos(&pDbInfo->slot_arr);
914 : }
915 0 : }
916 :
917 :
918 : static void
919 0 : print_rel_infos(RelInfoArr *rel_arr)
920 : {
921 : int relnum;
922 :
923 0 : for (relnum = 0; relnum < rel_arr->nrels; relnum++)
924 0 : pg_log(PG_VERBOSE, "relname: \"%s.%s\", reloid: %u, reltblspace: \"%s\"",
925 0 : rel_arr->rels[relnum].nspname,
926 0 : rel_arr->rels[relnum].relname,
927 0 : rel_arr->rels[relnum].reloid,
928 0 : rel_arr->rels[relnum].tablespace);
929 0 : }
930 :
931 : static void
932 0 : print_slot_infos(LogicalSlotInfoArr *slot_arr)
933 : {
934 : /* Quick return if there are no logical slots. */
935 0 : if (slot_arr->nslots == 0)
936 0 : return;
937 :
938 0 : pg_log(PG_VERBOSE, "Logical replication slots in the database:");
939 :
940 0 : for (int slotnum = 0; slotnum < slot_arr->nslots; slotnum++)
941 : {
942 0 : LogicalSlotInfo *slot_info = &slot_arr->slots[slotnum];
943 :
944 0 : pg_log(PG_VERBOSE, "slot name: \"%s\", output plugin: \"%s\", two_phase: %s",
945 : slot_info->slotname,
946 : slot_info->plugin,
947 0 : slot_info->two_phase ? "true" : "false");
948 : }
949 : }
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