在Oracle 19c多租戶環(huán)境的PDB數(shù)據(jù)庫下面創(chuàng)建一個(gè)DIRECTORY時(shí)，遇到了“ORA-65254: invalid path specified for the directory”，下面簡單演示一下所遇到的這個(gè)案例

SQL>?CREATE?PLUGGABLE?DATABASE?PDB6?ADMIN?USER?pdbadmin?IDENTIFIED?BY?hqLDJ7236#4U8JHD??2??STORAGE?(MAXSIZE?1G?MAX_SHARED_TEMP_SIZE?2G)??3??DEFAULT?TABLESPACE?TEST?DATAFILE?'/db19c/oracle_data/PDB6/test_data_01.dbf'?SIZE?100M??4??PATH_PREFIX?='/db19c/oracle_data/PDB6/'??5??FILE_NAME_CONVERT=('/db19c/CTEST/pdbseed/','/db19c/oracle_data/PDB6/');Pluggable?database?created.SQL>?SQL>?alter?pluggable?database?pdb6?open;Pluggable?database?altered.SQL>?alter?session?set?container=PDB6;Session?altered.SQL>?CREATE?OR?REPLACE?DIRECTORY?EXP_DUMP?AS?'/db19c/exp_dump';CREATE?OR?REPLACE?DIRECTORY?EXP_DUMP?AS?'/db19c/exp_dump'*ERROR?at?line?1:ORA-65254:?invalid?path?specified?for?the?directory##注意，創(chuàng)建DIRECTORY時(shí)，這個(gè)目錄/db19c/exp_dump已經(jīng)存在。SQL>?SQL>?!oerr?ora?6525465254,?00000,?'invalid?path?specified?for?the?directory'//?*Cause:???An?absolute?path?was?used?in?the?CREATE?DIRECTORY?statement.?//???????????Since?the?PDB?has?set?the?PATH_PREFIX?property,?only?relative//???????????path?is?allowed?for?directories.//?*Action:??Specify?a?relative?path?and?reissue?the?statement.//SQL>

如上所示，數(shù)據(jù)庫提示，出現(xiàn)這個(gè)錯(cuò)誤的原因在于創(chuàng)建PDB的語句中指定了PATH_PREFIX參數(shù)，創(chuàng)建目錄DIRECTORY時(shí)只能使用相對路徑，而不能使用絕對路徑。其實(shí)創(chuàng)建PDB時(shí)，如果設(shè)置了PATH_PREFIX參數(shù)，那么這個(gè)PDB中的所有對象只能限定在PATH_PREFIX指定的路徑下，,只能指定基于PATH_PREFIX的相對路徑。官方文檔關(guān)于這個(gè)的解釋如下所示：

Restrictions on PDB File Locations

The PATH_PREFIX clause of the CREATE PLUGGABLE DATABASE statement ensures that all directory object paths associated with the PDB are restricted to the specified directory or its subdirectories. This clause also ensures that the following files associated with the PDB are restricted to the specified directory: the Oracle XML repository for the PDB, files created with a CREATE PFILE statement, and the export directory for Oracle wallets. Use this clause when you want to ensure that a PDB's files reside in a specific directory and its subdirectories. You can use this clause to specify one of the following options:

An absolute path that is used as a prefix for all file paths associated with the PDB.

The name of a directory object that exists in the CDB root (CDB$ROOT). The directory object points to the absolute path to be used for PATH_PREFIX.

NONE to indicate that there are no restrictions for the file paths. Omitting the PATH_PREFIX clause is the same as specifying NONE.

After a PDB is created, its PATH_PREFIX setting cannot be modified.

也就是說，如果我要?jiǎng)?chuàng)建一個(gè)目錄，只能使用相對路徑的目錄，而且必須在PATH_PREFIX指定的/db19c/oracle_data/PDB6/下面，想指定到其他路徑，例如/db19c/exp_dump.此時(shí)就會(huì)拋出ORA-65254錯(cuò)誤。

解決方法SQL>?CREATE?OR?REPLACE?DIRECTORY?EXP_DUMP?AS?'exp_dump';Directory?created.SQL>?SET?LINESIZE?1080;SQL>?COL?OWNER?FOR?A16;SQL>?COL?DIRECTORY_NAME?FOR?A30;SQL>?COL?DIRECTORY_PATH?FOR?A64;SQL>?SELECT?*?FROM?DBA_DIRECTORIES;OWNER??????DIRECTORY_NAME???????DIRECTORY_PATH?????????????????ORIGIN_CON_ID-------?------------------?-----------------------------------?-------------SYS??????????????EXP_DUMP???/db19c/oracle_data/PDB6/exp_dump???

關(guān)于這種問題，如果在創(chuàng)建PDB數(shù)據(jù)庫時(shí)，不設(shè)定參數(shù)PATH_PREFIX就不會(huì)遇到這個(gè)問題。一般沒有特殊要求，也不用設(shè)定參數(shù)PATH_PREFIX。

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