.
\nWhen you cannot open a database, you will get some users unhappy. When you cannot open multitenant database, then the number of unhappy users is multiplied by the number of PDBs. I like to encounter problems in my lab before seeing them in production. Here is a case where I’ve lost a file. I don’t care about the tablespace, but would like to put it offline and at least be able to open the database.
\n<\/p>\n
So, it’s my lab, I dropped a file while the database was down. The file belongs to a PDB but I cannot open the CDB:<\/p>\n
\nSQL> startup\nORACLE instance started.\n \nTotal System Global Area 1577058304 bytes\nFixed Size 8793208 bytes\nVariable Size 1124074376 bytes\nDatabase Buffers 436207616 bytes\nRedo Buffers 7983104 bytes\nDatabase mounted.\nORA-01113: file 23 needs media recovery\nORA-01110: data file 23: '\/tmp\/STATSPACK.dbf'\n<\/code><\/pre>\nYes this is a lab, I like to put datafiles in \/tmp (lab only) and I was testing my Statspack scripts for an article to be published soon. I’ve removed the file and have no backup. I recommand to do nasty things on labs, because those things sometimes happen on production systems and better be prepared. This recommandation supposes you cannot mistake your lab prompt with a production one of course.<\/p>\n
ORA-01157<\/h3>\n
The database is in mount. I cannot open it:<\/p>\n
\nSQL> alter database open; \nalter database open \n* \nERROR at line 1: \nORA-01157: cannot identify\/lock data file 23 - see DBWR trace file \nORA-01110: data file 23: '\/tmp\/STATSPACK.dbf' \n<\/code><\/pre>\nThis is annoying. I would like to deal with this datafile later and open the CDB. I accept that the PDB it belongs to (PDB1 here) cannot be opened but I wish I can open the other ones quickly.<\/p>\n
ORA-01219<\/h3>\n
Let’s go to the PDB and take the datafile offline:<\/p>\n
\nSQL> alter session set container=pdb1;\nSession altered.\n \nSQL> alter database datafile 23 offline for drop;\nalter database datafile 23 offline for drop\n*\nERROR at line 1:\nORA-00604: error occurred at recursive SQL level 1\nORA-01219: database or pluggable database not open: queries allowed on fixed tables or views only\n<\/code><\/pre>\nThis is quite annoying. I know that the database is not open. I know that the pluggable database is not open. I want to put a datafile offline, and this is an operation that concerns only the controlfile. No need to have the database opened. Actually, I need to put this datafile offline in order to open the CDB.<\/p>\n
SQL_TRACE<\/h3>\n
This is annoying, but you know why Oracle is the best database system: troubleshooting. I have an error produced by recursive SQL (ORA-00604) and I want to know the SQL statement that raised this error:<\/p>\n
\nSQL> alter session set sql_trace=true;\nalter session set sql_trace=true;\n*\nERROR at line 1:\nORA-00604: error occurred at recursive SQL level 1\nORA-01219: database or pluggable database not open: queries allowed on fixed tables or views only\n<\/code><\/pre>\nOh yes, I forgot that I cannot issue any SQL statement. But you know why Oracle is the best database system: troubleshooting.<\/p>\n
\nSQL> oradebug setmypid\nStatement processed.\nSQL> oradebug EVENT 10046 TRACE NAME CONTEXT FOREVER, LEVEL 12;\nStatement processed.\n \nSQL> alter database datafile 23 offline for drop;\nalter database datafile 23 offline for drop\n*\nERROR at line 1:\nORA-00604: error occurred at recursive SQL level 1\nORA-01219: database or pluggable database not open: queries allowed on fixed tables or views only\n \nSQL> oradebug EVENT 10046 TRACE NAME CONTEXT OFF;\nStatement processed.\nSQL> oradebug TRACEFILE_NAME\n\/u01\/app\/oracle\/diag\/rdbms\/orcl\/orcl1\/trace\/orcl1_ora_20258.trc\n<\/code><\/pre>\nHere is the trace:<\/p>\n
\n*** 2017-02-21T13:36:51.239026+01:00 (PDB1(3))\n=====================\nPARSING IN CURSOR #140359700679600 len=34 dep=0 uid=0 oct=35 lid=0 tim=198187306591 hv=3069536809 ad='7b8db148' sqlid='dn9z45avgauj9'\nalter database datafile 12 offline\nEND OF STMT\nPARSE #140359700679600:c=3000,e=71171,p=0,cr=0,cu=0,mis=1,r=0,dep=0,og=1,plh=0,tim=198187306590\nWAIT #140359700679600: nam='PGA memory operation' ela= 30 p1=327680 p2=1 p3=0 obj#=-1 tim=198187307242\nWAIT #140359700679600: nam='control file sequential read' ela= 14 file#=0 block#=1 blocks=1 obj#=-1 tim=198187307612\nWAIT #140359700679600: nam='control file sequential read' ela= 13 file#=0 block#=16 blocks=1 obj#=-1 tim=198187307743\nWAIT #140359700679600: nam='control file sequential read' ela= 6 file#=0 block#=18 blocks=1 obj#=-1 tim=198187307796\nWAIT #140359700679600: nam='control file sequential read' ela= 9 file#=0 block#=1119 blocks=1 obj#=-1 tim=198187307832\n<\/code><\/pre>\nThis is expected. I’m in PDB1 (container id 3) and run my statement to put the datafile offline.
\nAnd then it switches to CDB$ROOT (container 0):<\/p>\n
\n*** 2017-02-21T13:36:51.241022+01:00 (CDB$ROOT(1))\n=====================\nPARSING IN CURSOR #140359700655928 len=248 dep=1 uid=0 oct=3 lid=0 tim=198187308584 hv=1954812753 ad='7b67d9c8' sqlid='6qpmyqju884uj'\nselect ruletyp#, ruleval, status, ltime from lockdown_prof$ where prof#=:1 and level#=:2 order by ltime\nEND OF STMT\nPARSE #140359700655928:c=2000,e=625,p=0,cr=0,cu=0,mis=1,r=0,dep=1,og=4,plh=0,tim=198187308583\n=====================\nPARSE ERROR #140359700655928:len=249 dep=1 uid=0 oct=3 lid=0 tim=198187308839 err=1219\nselect ruletyp#, ruleval, status, ltime from lockdown_prof$ where prof#=:1 and level#=:2 order by ltime\n \n*** 2017-02-21T13:36:51.241872+01:00 (PDB1(3))\nEXEC #140359700679600:c=4000,e=2684,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=0,tim=198187309428\nERROR #140359700679600:err=604 tim=198187309511\n<\/code><\/pre>\nI have a parse error when reading LOCKDOWN_PROF$ in the root container. It is a table, a dictionary table stored in SYSTEM tablespace. The CDB is not open. It is not accessible, reason for the error message.<\/p>\n
Then, I remember that I’ve set a lockdown profile at CDB level. It doesn’t make sense for CDB$ROOT, but I’ve set it to get it as default for all new created PDBs. Any statement that may be disabled by a lockdown profile has to read the lockdown profile rules stored in root. And here I learn that this occurs when parsing the DDL statement, not at execution time.<\/p>\n
In my opinion this is a bug. Either I should not set pdb_lockdown at CDB level, or it shouldn’t be checked when the CDB is closed. Because then any DDL will fail. I’m not blocked by the lockdown profile here. Just because the lockdown profile cannot be read.<\/p>\n
pdb_lockdown<\/h3>\n
Now I know how to workaround the problem: unset the lockdown profile, offline my datafile, open the CDB, open the PDB, drop the tablespace.<\/p>\n
SQL> alter system set pdb_lockdown='';\nSystem altered.\nSQL> alter session set container=pdb1;\nSession altered.\nSQL> alter database datafile 23 offline for drop;\nDatabase altered.\nSQL> alter session set container=cdb$root;\nSession altered.\nSQL> alter database open;<\/code><\/pre>\nLockdown profile is a very nice feature allowing fine grain control on what can be done by users on a PDB, even admins ones. But it is a new mecanism, leading to situations we have never seen before. Don’t forget the power (and fun) of troubleshooting.<\/p>\n","protected":false},"excerpt":{"rendered":"
By Franck Pachot . When you cannot open a database, you will get some users unhappy. When you cannot open multitenant database, then the number of unhappy users is multiplied by the number of PDBs. I like to encounter problems in my lab before seeing them in production. Here is a case where I’ve lost […]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[220,1040,64,96,209,66,223],"type_dbi":[],"class_list":["post-9802","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-cdb","tag-lockdown-profiles","tag-multitenant","tag-oracle","tag-oracle-12c","tag-pdb","tag-pluggable-databases"],"acf":[],"yoast_head":"\n
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