我有一个大型（50+ GB）Postgres集群，我试图在9.2上备份以升级到9.4。服务器是CentOS 6.6。
当我运行pg_dumpall时，它会达到大约48GB，然后失败并显示：
pg_dump: [archiver (db)] query failed: ERROR: could not access file "$libdir/postgis-2.0": No such file or directory
pg_dump: [archiver (db)] query was: SELECT a.attnum, a.attname, a.atttypmod, a.attstattarget, a.attstorage, t.typstorage, a.attnotnull, a.atthasdef, a.attisdropped, a.attlen, a.attalign, a.attislocal, pg_catalog.format_type(t.oid,a.atttypmod) AS atttypname, array_to_string(a.attoptions, ', ') AS attoptions, CASE WHEN a.attcollation <> t.typcollation THEN a.attcollation ELSE 0 END AS attcollation, pg_catalog.array_to_string(ARRAY(SELECT pg_catalog.quote_ident(option_name) || ' ' || pg_catalog.quote_literal(option_value) FROM pg_catalog.pg_options_to_table(attfdwoptions) ORDER BY option_name), E',
') AS attfdwoptions FROM pg_catalog.pg_attribute a LEFT JOIN pg_catalog.pg_type t ON a.atttypid = t.oid WHERE a.attrelid = '18040917'::pg_catalog.oid AND a.attnum > 0::pg_catalog.int2 ORDER BY a.attrelid, a.attnum
以下是“select version（）;”的输出：
PostgreSQL 9.2.10 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-11), 64-bit
以下是“SELECT PostGIS_full_version（）;”的结果：
POSTGIS="2.1.5 r13152" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0, 6 March 2012" GDAL="GDAL 1.9.2, released 2012/10/08" LIBXML="2.7.6" LIBJSON="UNKNOWN" TOPOLOGY RASTER
似乎有些东西指向PostGIS 2.0（早已不复存在）。
如何获得完整转储以便升级到9.4？
更重要的是，我如何解决这个问题，以便在升级的任何时候都不会遇到这种情况？
更新：这最终成为集群中尚未使用的旧数据库，无论出于何种原因尚未更新到更高版本的PostGIS。删除后，备份和升级顺利进行。