digoal
2021-08-05
PostgreSQL , pg_upgrade , extension
如果你的new cluster安装的插件版本已经超过了old cluster的插件版本, 在pg_upgrade生成的脚本中会自动加入alter extension upgrade的内容, 执行升级插件.
+
+
+/*
+ * report_extension_updates()
+ * Report extensions that should be updated.
+ */
+void
+report_extension_updates(ClusterInfo *cluster)
+{
+ int dbnum;
+ FILE *script = NULL;
+ bool found = false;
+ char *output_path = "update_extensions.sql";
+
+ prep_status("Checking for extension updates");
+
+ for (dbnum = 0; dbnum < cluster->dbarr.ndbs; dbnum++)
+ {
+ PGresult *res;
+ bool db_used = false;
+ int ntups;
+ int rowno;
+ int i_name;
+ DbInfo *active_db = &cluster->dbarr.dbs[dbnum];
+ PGconn *conn = connectToServer(cluster, active_db->db_name);
+
+ /* find hash indexes */
+ res = executeQueryOrDie(conn,
+ "SELECT name "
+ "FROM pg_available_extensions "
+ "WHERE installed_version != default_version"
+ );
+
+ ntups = PQntuples(res);
+ i_name = PQfnumber(res, "name");
+ for (rowno = 0; rowno < ntups; rowno++)
+ {
+ found = true;
+
+ if (script == NULL && (script = fopen_priv(output_path, "w")) == NULL)
+ pg_fatal("could not open file \"%s\": %s\n", output_path,
+ strerror(errno));
+ if (!db_used)
+ {
+ PQExpBufferData connectbuf;
+
+ initPQExpBuffer(&connectbuf);
+ appendPsqlMetaConnect(&connectbuf, active_db->db_name);
+ fputs(connectbuf.data, script);
+ termPQExpBuffer(&connectbuf);
+ db_used = true;
+ }
+ fprintf(script, "ALTER EXTENSION %s UPDATE;\n",
+ quote_identifier(PQgetvalue(res, rowno, i_name)));
+ }
+
+ PQclear(res);
+
+ PQfinish(conn);
+ }
+
+ if (script)
+ fclose(script);
+
+ if (found)
+ {
+ report_status(PG_REPORT, "notice");
+ pg_log(PG_REPORT, "\n"
+ "Your installation contains extensions that should be updated\n"
+ "with the ALTER EXTENSION command. The file\n"
+ " %s\n"
+ "when executed by psql by the database superuser will update\n"
+ "these extensions.\n\n",
+ output_path);
+ }
+ else
+ check_ok();
+}
您的愿望将传达给PG kernel hacker、数据库厂商等, 帮助提高数据库产品质量和功能, 说不定下一个PG版本就有您提出的功能点. 针对非常好的提议，奖励限量版PG文化衫、纪念品、贴纸、PG热门书籍等，奖品丰富，快来许愿。开不开森.
