DBA Blogs

RMAN-06172: no AUTOBACKUP found or specified handle is not a valid copy or piece

Hemant K Chitale - 4 hours 36 min ago

 You are attempting to restore a database to another server.  

So, you have verified that you have controlfile and datafile backups on the source server  :



RMAN> list backup of controlfile;

using target database control file instead of recovery catalog

List of Backup Sets
===================


BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
51 Full 11.52M DISK 00:00:01 20-FEB-21
BP Key: 51 Status: AVAILABLE Compressed: NO Tag: TAG20210220T114245
Piece Name: /opt/oracle/FRA/HEMANT/autobackup/2021_02_20/o1_mf_s_1065008565_j3119p5t_.bkp
Control File Included: Ckp SCN: 1093419 Ckp time: 20-FEB-21

BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
55 Full 11.52M DISK 00:00:02 04-MAY-21
BP Key: 55 Status: AVAILABLE Compressed: NO Tag: TAG20210504T232054
Piece Name: /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703254_j92slr2m_.bkp
Control File Included: Ckp SCN: 1126526 Ckp time: 04-MAY-21

BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
56 Full 11.48M DISK 00:00:01 04-MAY-21
BP Key: 56 Status: AVAILABLE Compressed: NO Tag: TAG20210504T232851
Piece Name: /home/oracle/controlfile.bak
Control File Included: Ckp SCN: 1126757 Ckp time: 04-MAY-21

BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
57 Full 11.52M DISK 00:00:02 04-MAY-21
BP Key: 57 Status: AVAILABLE Compressed: NO Tag: TAG20210504T232853
Piece Name: /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703733_j92t1pow_.bkp
Control File Included: Ckp SCN: 1126766 Ckp time: 04-MAY-21

RMAN>


You have copied the backups to the target, new, server and attempt to restore :

oracle19c>rman target /

Recovery Manager: Release 19.0.0.0.0 - Production on Wed May 5 22:27:26 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle and/or its affiliates. All rights reserved.

connected to target database (not started)

RMAN> startup nomount;

Oracle instance started

Total System Global Area 1207958960 bytes

Fixed Size 8895920 bytes
Variable Size 318767104 bytes
Database Buffers 872415232 bytes
Redo Buffers 7880704 bytes

RMAN> restore controlfile from '/home/oracle/controlfile.bak';

Starting restore at 05-MAY-21
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=20 device type=DISK

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 05/05/2021 22:27:47
RMAN-06172: no AUTOBACKUP found or specified handle is not a valid copy or piece

RMAN>
RMAN> quit


Recovery Manager complete.
oracle19c>ls /home/oracle/controlfile.bak
/home/oracle/controlfile.bak
oracle19c>ls /opt/oracle/FRA/HEMANT/autobackup/2021_02_20/o1_mf_s_1065008565_j3119p5t_.bkp
/opt/oracle/FRA/HEMANT/autobackup/2021_02_20/o1_mf_s_1065008565_j3119p5t_.bkp
oracle19c>ls /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703254_j92slr2m_.bkp
/opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703254_j92slr2m_.bkp
oracle19c>ls /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703733_j92t1pow_.bkp
/opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703733_j92t1pow_.bkp
oracle19c>


So, why do you get the RMAN-06172 error ?  All the controlfile backups, including the manual backup to /home/oracle/controlfile.bak and the three autobackups, one from February 2021 and two from 04-May-2021 are available.

oracle19c>oerr rman 6172
6172, 1, "no AUTOBACKUP found or specified handle is not a valid copy or piece"
// *Cause: A restore could not proceed because no AUTOBACKUP was found or
// specified handle is not a valid copy or backup piece.
// In case of restore from AUTOBACKUP, it may be the case that a
// backup exists, but it does not satisfy the criteria specified in
// the user's restore operands.
// In case of restore from handle, it may be the handle is not a
// backup piece or control file copy. In may be that it does not
// exist.
// *Action: Modify AUTOBACKUP search criteria or verify the handle.
oracle19c>
oracle19c>ls -l /home/oracle/controlfile.bak
-rw-r-----. 1 root root 12058624 May 4 23:28 /home/oracle/controlfile.bak
oracle19c>ls -l /opt/oracle/FRA/HEMANT/autobackup/2021_02_20/o1_mf_s_1065008565_j3119p5t_.bkp
-rw-r-----. 1 root root 12091392 Feb 20 11:42 /opt/oracle/FRA/HEMANT/autobackup/2021_02_20/o1_mf_s_1065008565_j3119p5t_.bkp
oracle19c>ls -l /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703254_j92slr2m_.bkp
-rw-r-----. 1 root root 12091392 May 4 23:20 /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703254_j92slr2m_.bkp
oracle19c>ls -l /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703733_j92t1pow_.bkp
-rw-r-----. 1 root root 12091392 May 4 23:28 /opt/oracle/FRA/HEMANT/autobackup/2021_05_04/o1_mf_s_1071703733_j92t1pow_.bkp
oracle19c>


You get the "error" message that there are no AUTOBACKUPs because the "oracle19c" account is unable to actually *read* those pieces.  It can list them using "ls" because it has permission to read the OS folders containing them, but it does no have permission to read the files owned by root without having granted read permission.

So, before you start wondering about your AUTOBACKUP configuration or search criteria specification like "RESTORE CONTROLFILE FROM AUTOBACKUP MAXDAYS 30",  check if the backup pieces are readable.


Categories: DBA Blogs

Avoiding overlap values...

Tom Kyte - Tue, 2021-05-04 12:26
Hai Mr Tam, U said U have a 'trick' for the following problem. It couldbe nice if u tell me that..thanks. A form(5.0) with tabular style is displayed like below.. to from discount -- --- ----- 10 40 1.5 50 65 2.5 70 90 1.2 . . . . 60 99 ----> should not be allowed. 65 80 ----> should not be allowed. Is there a way . . . . But I would like to stop OVERLAPPING range like above shown with arrow marks. How can I do it. Thanks once again rgs priya
Categories: DBA Blogs

Fluctuating counts on ROWID splits using DIY parallelism.

Tom Kyte - Mon, 2021-05-03 18:26
Hi Tom, Chris, Connor and all, I've been a user of your DIY Parallel solution for many years now as a way to pull data out of large unpartitioned tables in parallel to send to other non-Oracle databases or for file system archiving. I've ran into a situation recently at my last company and now my new company where the solution is acting different. I first noticed the change at my old company when the data warehouse I was supporting was moved to an Exadata system in OCI. The version of the database stayed the same, 11.2.0.4, making the only change being the hardware/datacenter move. What happened was during a row count validation of a table export based upon rowid splits the counts didn't match what was exported. Upon further investigation I found that the row count for a given rowid split was flutuating. Upon doing one count it would return a value and then the value would change upon subsequent counts. The count didn't just go up, it would go up and down between a set of three or four different values, making getting an accurate count imposssible. The SQL I'd used to do this was of the formats: <code>SELECT COUNT(*) FROM X.XXX WHERE ROWID BETWEEN 'AAC2GBAFRAAD+c4AAP' AND 'AAC2GBAGIAAJ97wABX';</code> or <code>SELECT COUNT(*) FROM X.XXX WHERE ROWID > 'AAC2GBAFRAAD+c4AAP' AND ROWID <= 'AAC2GBAGIAAJ97wABX';</code> I can see where the counts could increment up if data is being added to the table but these were static tables and the count bounced back and forth between a few different sets of numbers. I'm now seeing this happen on other databases at my new job and I'm not sure what the cause of it is. I can't pin it down to a type of table or version or whether it's Exadata related or maybe something related to background work ASM is doing. I did a search to see if anyone else is having this occur to them without any luck. I'm seeing where lots of folks have implemented it but not where the row counts for a given split fluctuates. Do you have any idea what could be causing this and how to make it stop? It doesn't happen on all rowid splits for a table and it doesn't happen for all tables in a given database, it appears to be very random. Thanks, Russ
Categories: DBA Blogs

My Posts on RMAN

Hemant K Chitale - Sat, 2021-05-01 23:05

 My series of posts on RMAN :

1. 1 : Backup Job Details

2. 2 : ArchiveLog Deletion Policy

3. 3 : The DB_UNIQUE_NAME in Backups to the FRA

4. 4 : Recovering from an Incomplete Restore

5. 4b : Recovering from an Incomplete Restore with OMF Files

6. 5 : Useful KEYWORDs and SubClauses

7. 5b : (More) Useful KEYWORDs and SubClauses

8. 5c : (Some More) Useful KEYWORDs and SubClauses

9. 6 : RETENTION POLICY and CONTROL_FILE_RECORD_KEEP_TIME

10. 7 : Recovery Through RESETLOGS -- how are the ArchiveLogs identified ?

11. 8 : Using a Recovery Catalog Schema

12. 9 : Querying the RMAN Views / Catalog

13. 10 : VALIDATE


An older series of "tips" :

14. Tips -- 1

15. Tips -- 2

16. Tips -- 3

17. Tips -- 4


Other RMAN posts not in the  above series : (not in any particular order)

18. RMAN's CATALOG command

19. RESTORE and RECOVER a NOARCHIVELOG Database, with Incremental Backups

20. RESTORE and RECOVER a NOARCHIVELOG Database, with Incremental Backups -- 2nd Post

21. Primary and Standby in the same RMAN Catalog

22. Understanding Obsolescence of RMAN Backups

23. "SET TIME ON" in RMAN

24. RMAN Backup of a Standby Database

25. RMAN Image Copy File Names

26. Verifying an RMAN Backup

27. Verifying an RMAN Backup - Part 2

28. Misinterpreting RESTORE DATABASE VALIDATE

29. RMAN Backup and Recovery for Loss of ALL Files

30. CONTROLFILE AUTOBACKUPs are OBSOLETE[d]

31.RMAN Consistent ("COLD" ?) Backup and Restore

32. Archive Log Deletion Policy with a Standby Database

33. Datafiles not Restored -- using V$DATAFILE and V$DATAFILE_HEADER

34. Read Only Tablespaces and BACKUP OPTIMIZATION


Categories: DBA Blogs

Pro*C in Oracle

Hemant K Chitale - Sat, 2021-05-01 05:48

 Oracle also ships a Pro*C Precompiler that can convert a Pro*C source file to a C source file which can then be compiled  using a C Compiler (e.g  using "gcc").  Of course, you need the Pro*C Developer Licence to use this product.

Here is a quick demo with the command line display and then the actual code below.



oracle19c>ls -ltr
total 12
-rw-r--r--. 1 oracle oinstall 2255 May 1 18:07 instancedbinfo.pc
-rwxr--r--. 1 oracle oinstall 786 May 1 18:14 Compile_my_ProC.SH
-rwxr--r--. 1 oracle oinstall 356 May 1 18:15 Run_my_ProC.SH
oracle19c>./Compile_my_ProC.SH
*****Set LD_LIBRARY_PATH
*****Set C_INCLUDE_PATH
*****PreCompile Pro*C program file

Pro*C/C++: Release 19.0.0.0.0 - Production on Sat May 1 18:15:17 2021
Version 19.3.0.0.0

Copyright (c) 1982, 2019, Oracle and/or its affiliates. All rights reserved.

System default option values taken from: /opt/oracle/product/19c/dbhome_1/precomp/admin/pcscfg.cfg

*****Compile using C Compiler and specifying Oracle Client library file libclntsh.so
*****Compiled files:
-rw-r--r--. 1 oracle oinstall 2255 May 1 18:07 instancedbinfo.pc
-rw-r--r--. 1 oracle oinstall 0 May 1 18:15 instancedbinfo.lis
-rw-r--r--. 1 oracle oinstall 11875 May 1 18:15 instancedbinfo.c
-rwxr-xr-x. 1 oracle oinstall 14424 May 1 18:15 instancedbinfo
oracle19c>
oracle19c>
oracle19c>
oracle19c>./Run_my_ProC.SH
*****Set LD_LIBRARY_PATH
*****Set Connection String
*****Execute the program
Connected to ORACLE
At ORCLCDB which is on oracle-19c-vagrant running 19.0.0.0.0 and is OPEN, started at 01-MAY-21 17:54:52
This is ORCLPDB1 database running in READ WRITE mode since 01-MAY-21 05.55.21.573 PM +08:00

oracle19c>


The file "instancedbinfo.pc" is my Pro*C source code.
I Precompile it using the "proc" precompiler into "instancedbinfo.c".  Any compilation errors would have been logged into "instancedbinfo.lis"
Then, the same script "Compile_my_ProC.SH" compiles the C program source code into an executable "instancedbinfo" using "gcc"

Finally, I use "Run_my_ProC.SH" to execute the file "instancedbinfo"  (which is now an executable) and the execution displays information about the Pluggable database it is connected to.


Here is the code for the two shell scripts :


oracle19c>cat Compile_my_ProC.SH

echo "*****Set LD_LIBRARY_PATH"
LD_LIBRARY_PATH=/usr/lib/gcc/x86_64-redhat-linux/4.8.2/include:/usr/include/linux:/opt/oracle/product/19c/dbhome_1/precom/lib:/opt/oracle/product/19c/dbhome_1/lib
export LD_LIBRARY_PATH


echo "*****Set C_INCLUDE_PATH"
C_INCLUDE_PATH=/usr/lib/gcc/x86_64-redhat-linux/4.8.2/include:/usr/include/linux:/opt/oracle/product/19c/dbhome_1/precom/lib:/opt/oracle/product/19c/dbhome_1/lib:/opt/oracle/product/19c/dbhome_1/precomp/public
export C_INCLUDE_PATH

echo "*****PreCompile Pro*C program file"
proc instancedbinfo.pc

echo "*****Compile using C Compiler and specifying Oracle Client library file libclntsh.so"
gcc instancedbinfo.c -o instancedbinfo -L /opt/oracle/product/19c/dbhome_1/lib -l clntsh

echo "*****Compiled files:"
ls -ltr instancedbinfo*
oracle19c>


oracle19c>cat Run_my_ProC.SH

echo "*****Set LD_LIBRARY_PATH"
LD_LIBRARY_PATH=/usr/lib/gcc/x86_64-redhat-linux/4.8.2/include:/usr/include/linux:/opt/oracle/product/19c/dbhome_1/precom/lib:/opt/oracle/product/19c/dbhome_1/lib
export LD_LIBRARY_PATH

echo "*****Set Connection String"
CNCTSTRING=hemant/hemant@orclpdb1
export CNCTSTRING

echo "*****Execute the program"
./instancedbinfo
oracle19c>


The Compilation script specifies the LD_LIBRARY_PATH and the Paths to the Include (.h Header) files.  
It then executes "proc"  (which is in $ORACLE_HOME/bin) to precompile the "instancedbinfo.pc" source file.
Finally, it calls "gcc" to compile the c-language source code file (generated by the Precomipler), also specifiying the client shared library file libclntsh.so  in $ORACLE_HOME/lib  (only "-l clntsh" is sufficient to identify the file name).  The compiled executable is called "instancedbinfo" with Execute Permission.

The Run script specifies the Connect-String that the executable will be reading from the environment and executes it.


Here is the code of the source Pro*C file :


oracle19c>cat instancedbinfo.pc

/* standard C includes */
#include << stdio.h >>
#include << stdlib.h >>
#include << string.h >>



/* Oracle Pro*C includes from $ORACLE_HOME/precomp/public */
#include << sqlca.h >>
#include << sqlda.h >>
#include << sqlcpr.h >>




/* my variables */
varchar MYinstanceName[16];
varchar MYhostName[64];
varchar MYversion[17];
varchar MYstatus[12];
varchar MYinstanceStartupTime[18];
varchar MYdbName[128];
varchar MYdbOpenMode[10];
varchar MYdbOpenTime[32];



/* function for error handling */
void sql_error(msg)
char msg[200];
{
char err_msg[128];
size_t buf_len, msg_len;

EXEC SQL WHENEVER SQLERROR CONTINUE;

printf("\n%s\n", msg);
buf_len = sizeof (err_msg);
sqlglm(err_msg, &buf_len, &msg_len);
printf("%.*s\n", msg_len, err_msg);

EXEC SQL ROLLBACK RELEASE;
exit(EXIT_FAILURE);
}


/* MAIIN program */
int main(argc,argv)
int argc;
char *argv[];
{

/* read Connection String from environment -- or, it could have been hardcoded here */
const char *conn = getenv("CNCTSTRING");
if (!conn) {
printf("! require CNCTSTRING env variable\n");
return (1);
}

EXEC SQL WHENEVER SQLERROR DO sql_error("ORACLE error--\n");

/* connect to targe database */
EXEC SQL CONNECT :conn ;
printf("Connected to ORACLE \n");


/* execute query and populate variables */
/* NOTE : This expects to connect to a PDB ! */
/* If the target is a Non-PDB, change references from v$pdbs to V$database */
EXEC SQL SELECT instance_name,host_name, version,
to_char(startup_time,'DD-MON-RR HH24:MI:SS'), status,
name, open_mode, to_char(open_time)
INTO :MYinstanceName, :MYhostName, :MYversion,
:MYinstanceStartupTime, :MYstatus,
:MYdbName, :MYdbOpenMode, :MYdbOpenTime
FROM v$instance, v$pdbs ;


/* display query results */
printf("At %s which is on %s running %s and is %s, started at %s \n",
MYinstanceName.arr, MYhostName.arr, MYversion.arr, MYstatus.arr, MYinstanceStartupTime.arr);
printf("This is %s database running in %s mode since %s \n",
MYdbName.arr, MYdbOpenMode.arr, MYdbOpenTime.arr);
printf("\n");

/* end of MAIN */
}
oracle19c>


(Note :  I have put doube angle brackets for the #includes so as to preserve them in HTML)
Pro*C allows embedding of SQL calls into a C program be including the Proc include files and then running the source code through a Precompiler.
My Pro*C source code file is 2,255 bytes and the C source code is 11,875 bytes.

Note that the variables defined as varchar in my Pro*C source file are actually become C structures :

/* my variables */
/* varchar MYinstanceName[16]; */
struct { unsigned short len; unsigned char arr[16]; } MYinstanceName;

/* varchar MYhostName[64]; */
struct { unsigned short len; unsigned char arr[64]; } MYhostName;

/* varchar MYversion[17]; */
struct { unsigned short len; unsigned char arr[17]; } MYversion;

/* varchar MYstatus[12]; */
struct { unsigned short len; unsigned char arr[12]; } MYstatus;

/* varchar MYinstanceStartupTime[18]; */
struct { unsigned short len; unsigned char arr[18]; } MYinstanceStartupTime;

/* varchar MYdbName[128]; */
struct { unsigned short len; unsigned char arr[128]; } MYdbName;

/* varchar MYdbOpenMode[10]; */
struct { unsigned short len; unsigned char arr[10]; } MYdbOpenMode;

/* varchar MYdbOpenTime[32]; */
struct { unsigned short len; unsigned char arr[32]; } MYdbOpenTime;


Similarly, my EXEC SQL query also gets re-written :
{
struct sqlexd sqlstm;
sqlstm.sqlvsn = 13;
sqlstm.arrsiz = 8;
sqlstm.sqladtp = &sqladt;
sqlstm.sqltdsp = &sqltds;
sqlstm.stmt = "select instance_name ,host_name ,version ,to_char(startup\
_time,'DD-MON-RR HH24:MI:SS') ,status ,name ,open_mode ,to_char(open_time) int\
o :b0,:b1,:b2,:b3,:b4,:b5,:b6,:b7 from v$instance ,v$pdbs ";
sqlstm.iters = (unsigned int )1;
sqlstm.offset = (unsigned int )51;
sqlstm.selerr = (unsigned short)1;
sqlstm.sqlpfmem = (unsigned int )0;
sqlstm.cud = sqlcud0;
sqlstm.sqlest = (unsigned char *)&sqlca;
sqlstm.sqlety = (unsigned short)4352;
sqlstm.occurs = (unsigned int )0;
sqlstm.sqhstv[0] = (unsigned char *)&MYinstanceName;
sqlstm.sqhstl[0] = (unsigned long )18;
sqlstm.sqhsts[0] = ( int )0;
sqlstm.sqindv[0] = ( short *)0;
sqlstm.sqinds[0] = ( int )0;
sqlstm.sqharm[0] = (unsigned long )0;
sqlstm.sqadto[0] = (unsigned short )0;
sqlstm.sqtdso[0] = (unsigned short )0;
sqlstm.sqhstv[1] = (unsigned char *)&MYhostName;
and so on .....


Pro*C is a very good way of combining C programming with SQL and creating an executable binary instead of an interpreted file (like a Java or Python program outside the database).



Categories: DBA Blogs

Regarding On Update Cascade

Tom Kyte - Fri, 2021-04-30 17:06
Dear Tom, We know that when we delete a parent record, automatically child record also will be deleted if we used "on delete cascade". Is it possible to update automatically a child record when we update parent record? (Do we have "On Update Cascade" option? Or any other like..)
Categories: DBA Blogs

How to send a sql query result as an attachment in Oracle apex_mail.send procedure.

Tom Kyte - Fri, 2021-04-30 17:06
I have a Oracle sql query which needs to be run and need to send the data returned by the query as an attachment to a mail. Could you please guide how can i do it using apex_mail.send procedure. I am calling apex_mail from database. I have already configured apex mail. I can call the apex_mail.send to send the mail. But i am not sure how can i attach the result returned by my oracle sql query in apex_mail.add attachment.
Categories: DBA Blogs

Timestamp with time zone comparison Issues

Tom Kyte - Thu, 2021-04-29 22:46
Hi, I am facing an issue while validating timestamp with timezone data with systimestamp in 11g R2. My DB server is in US/Central zone. I have a table with timestamp with timezone data type column and I have inserted a future timestamp for same timezone (US/Central or UTC-5). While selecting data from table, we get same data. I also have an anonymous block which verifies if timestamp in table crossed systimestamp of not. Before daylight saving changes on March, this process was working correctly. both methods returns correct output when systimestamp is greater than timestamp with timezone column. However, after daylight saving changes, record which was inserted by giving timezone as US/Central format, returns correct output only after 1hr from actual time. I have given a sample in livesql, hope this can help to explain issue I am facing. Is there any specific reason for this behavior? Thanks in advance for your help Thanks, Manoj
Categories: DBA Blogs

CTE failes when used with a db link

Tom Kyte - Thu, 2021-04-29 22:46
I am trying to use a cte in a query that copies data from one database to another. The cte is used because I am unable to handle a cycle with connect by. In this simple illustration the db link used by the insert causes an error (ORA-00942: table or view does not exist). <code>insert into don.T2@gstest (RELATE_STRING) with cte (LVL, I, PARENT_I, RELATE) as ( select 1 as LVL, I, PARENT_I, '+' || RELATE as RELATE from don.T1@gsdev where PARENT_I is null union all select c.LVL + 1, t.I, t.PARENT_I, c.RELATE || '+' || t.RELATE from cte c join T1 t on t.PARENT_I = c.I) select RELATE from cte order by LVL, I; </code> The illustration doesn't have a cycle issue, so connect by can be used to demonstrate. If I ensure that the code is executed from the target database and I remove the db link, the code works. <code>insert into don.T2 (RELATE_STRING)</code>... I was unable to figure out how to make a db link in liveSql.
Categories: DBA Blogs

Fixed Broken Links

Bobby Durrett's DBA Blog - Wed, 2021-04-28 11:48

I had a couple of new comments on older blog pages and I noticed that some links pointed to things which no longer exist. I fixed a few things that I knew were wrong. Finally, this week I decided to review every post back to the beginning 9 years ago and click on every link.

For dead links I removed the link and added a comment like (DOES NOT EXIST). In some cases, the link still existed but was different. I changed several links to Oracle’s documentation for example. In many cases I put (updated) or something like that to show that there was a new link. I synced up a lot of the old links to the current version of my scripts on GitHub. Hopefully these changes won’t make the older posts unreadable, but at least the links will point to useful and up to date versions of things.

I did not carefully read every post because I was in a hurry, but I did look at every post and it gave me the chance to see how things changed over the past 9 years. It was kind of a quick review of what I was thinking. Some of the posts seemed kind of dumb. (What was I thinking?) But others are genuinely useful. But it was interesting to see which topics I talked about and how that changed over time. It makes me wonder where things will go in the future. I guess I cannot expect to fully predict the future, but it is good to think about what I should be learning and what skills I should be developing as things go forward.

Anyway, hopefully the updated links will make the posts a little more helpful to myself and others.

Bobby

Categories: DBA Blogs

editing large clobs

Tom Kyte - Wed, 2021-04-28 10:06
Hi, I've developed an application in APEX which provides a feature to maintain files stored in a CLOB (well, actually it's a BLOB but I know how to handle this). This works very well as long as the size of the content doesn't exceed the 32k limit. If a file is bigger than this limit an error 'ORA-06502: PL/SQL: numeric or value error' is raised. Is there any solution which I can use to handle files with more then 32k chars in an apex app?
Categories: DBA Blogs

"java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver"

Tom Kyte - Wed, 2021-04-28 10:06
May I ask about the "java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver". Per Java document, the PATH and CLASSPATH shall be configured in the Windows 10 environment variables . Below are information regarding the system/database version and what I did. The Java version is as below. C:\>java -version java version "1.8.0_281" Java(TM) SE Runtime Environment (build 1.8.0_281-b09) Java HotSpot(TM) 64-Bit Server VM (build 25.281-b09, mixed mode) The JAVA_HOME is C:\Program Files\Java\jre\1.8.0_281 The CLASSPATH has C:\Program Files\Java\jdk\1.8.0_281 C:\Program Files\Java\jdk\1.8.0_281\bin C:\Program Files\Java\jre\1.8.0_281 C:\Program Files\Java\jre\1.8.0_281\bin C:\Oracle_RDBS_installation\product\12.2.0\client_1\bin C:\Oracle_RDBS_installation\product\12.2.0\dbhome_1\bin The compilation of Java program was successful by using "javac". But the class not found error message was returned during the run time. I have no problem accessing the Oracle database from Sql*Plus at all. I created two users, created a simple table for the sake of testing. Everything worked fine. I have no problem with the listener and the TNSNAES.ORA. Below is the information about database: SQL*Plus: Release 12.2.0.1.0 Production on Wed Apr 21 09:08:05 2021 Copyright (c) 1982, 2016, Oracle. All rights reserved. Enter user-name: c##_chiara Enter password: Last Successful login time: Sat Apr 17 2021 09:46:21 -04:00 Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production Below is the Java code: <Begin of the Java Code> import java.sql.*; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.Properties; public class Thirdj3 { public static void main(String[] args){ System.out.println("Beginning of the Thirdj3 program."); try{ //step1 load the driver class Class.forName("oracle.jdbc.driver.OracleDriver"); //step2 create the connection object Connection con=DriverManager.getConnection( "jdbc:oracle:thin:@DESKTOP-JBRID90.home:1521:orcl","c##_chiara","chiara"); //step3 create the statement object Statement stmt=con.createStatement(); //step4 execute query //*ResultSet rs=stmt.executeQuery("select * from emp"); //*while(rs.next()) //*System.out.println(rs.getInt(1)+" "+rs.getString(2)+" "+rs.getString(3)); //step5 close the connection object con.close(); } catch(Exception e){ System.out.println(e);} }//End of main }//End of Thirdj3 Class <end of the java code>
Categories: DBA Blogs

How can we query one database and get all databases' cell or IO usage from one database?

Tom Kyte - Wed, 2021-04-28 10:06
Hi Ask Tom Team, We had an issue in all of our production databases on an Exadata cluster. One RAC database's IO issue caused all databases on the cluster slowdown, user transactions took much more time, batch jobs hung. We need to run some scripts to consistently monitor the cluster besides OEM, so that we can identify the issues quicker and take actions sooner. OEM provides good information on our needs. We need your help to have related SQL scripts to generate same or similar information. In Oracle AWR reports. we can see a portion that is specific for Exadata. It appears in all AWR reports no matter in which database we run the awr report (global data), "Exadata Top Database Consumers". The information includes Cell usage and IO of all databases even though the AWR report is run only in one database (every AWR report has Exadata Top Database Consumers). Can you please help with related SQLs that generate that part of the AWR report? For example, how can we run a query to get "Top Databases by Requests" and so on by running queries only in one of the databases on the cluster. We checked all of the dictionary tables/views but failed to find any of them provide cluster information showing in AWR reports. We need to run the scripts (or stored procedure) periodically and have the system send us an email if any specific database's IO requests surpass a threshold we set. We can query live tables (GV$xxxxx) or DBA_HIST_XXXXX. Please advise. Thanks!
Categories: DBA Blogs

Script too slow - how to optimize

Tom Kyte - Wed, 2021-04-28 10:06
Can you advise me in how optimize this batch script : <code>CREATE OR REPLACE PACKAGE BODY ADMIN_WAFA.PCK_Trait_Pre IS -------------------------------------------------------------------------------- FUNCTION Fun_Traiter_Prelevement(P_CONTROL_ANO VARCHAR2) RETURN VARCHAR2 IS ------------------------------------------------------------------------------------------------------------------------- ---curseur prelevement----- CURSOR Prov_Cursor IS SELECT * FROM Prov_Prelevement; --------------------------- Code_Tier NUMBER; v_sql VARCHAR2(1000); --------------- ?????????????????????????????? ------------------------------------ BEGIN /*********************** Calcul des STATS ************************/ BEGIN DBMS_STATS.GATHER_TABLE_STATS(OWNNAME => 'ADMIN_WAFA', TABNAME => 'PROV_PRELEVEMENT', DEGREE => 8, CASCADE => TRUE, METHOD_OPT => 'FOR COLUMNS SIZE AUTO', ESTIMATE_PERCENT => 20); END; /************************ Resoudre PB PERF ************************/ -- alter session set optimizer_mode=RULE; EXECUTE IMMEDIATE ('alter session set optimizer_mode=RULE'); --Debut FZ HANOUNOU IF(P_CONTROL_ANO ='O') THEN Proc_Test_Anomalie; END IF; --Fin FZ HANOUNOU --------------------------------------------- --Modification par Karim EL HALOUI --le 15/12/2010 --pour la mise a jour de la vue materialisee --------------------------------------------- -- suppression BEGIN EXECUTE IMMEDIATE ('DROP MATERIALIZED VIEW vue_anomalie_ie_aff'); EXCEPTION WHEN OTHERS THEN NULL; END; -- creation v_sql:='CREATE MATERIALIZED VIEW vue_anomalie_ie_aff AS SELECT a.ano_num_aff,a.ano_ide_reg,a.ano_dat_ech FROM anomalie a where a.ano_pret_a>45'; execute immediate v_sql; ------------------ ?????? ------------------- v_sql:='alter FUNCTION F_ECH_ANOM compile'; execute immediate v_sql; v_sql:='alter package PKG_CTRL_PROMESSE_REG compile body'; execute immediate v_sql; --------------------------------------------- v_nom_fonction:='Proc_Traiter_Prelevement'; open Prov_cursor; LOOP FETCH Prov_cursor INTO Prov_record; EXIT WHEN Prov_cursor%NOTFOUND OR Prov_cursor%NOTFOUND is NULL; ---------------------------------- -- recherche du code_societe ---------------------------------- select s.code_societe into v_code_societe from societes s where s.lib_societe=prov_record.prov_societe; --------------------------------------------- IF not Fun_Test_New_aff THEN IF Fun_Test_New_tier THEN Code_Tier:=Fun_Ajout_Tier; ELSE Code_Tier:=Fun_Cle_Tier; END IF; ELSE Code_Tier:=Fun_Ajout_Tier; END IF; Proc_Ajout_Prelevement(Code_Tier); END LOOP; execute immediate('truncate table prov_prelevement'); v_nom_fonction:='proc_generation_interne'; pck_ban.proc_generation_interne; -------------------------------------------------------------------- v_nom_fonction:='proc_saisie_imp_bqe_interne'; proc_saisie_imp_bqe_interne; v_nom_fonction:='pck_ban.proc_generation_doti'; pck_ban.proc_generation_doti; update /*+choose*/ prelevement p set p.pre_dat_ech=to_char(sysdate,'DD/MM/YYYY') where exists (select null from vacation v where v.pre_ide_reg=p.pre_ide_reg) and p.pre_ide_reg<0 and exists (select null from tiers t where p.tier_cle=t.tier_cle and t.tier_code_societe=51 and t.tier_nom_agence='REPRCTX') and p.pre_dat_ech>to_char(sysdate,'DD/MM/YYYY'...
Categories: DBA Blogs

Set line delimiter in Textarea page item (CRLF vs LF)

Tom Kyte - Tue, 2021-04-27 15:46
Hi, in an app I'm developing in APEX I've seen, that lines entered in a text area page item are terminated with the windows style CRLF chars. It causes problems in an application which processes this data on UNIX systems. Sure we could transform this chars from CRLF to LF on the client, but would it be possible to define the way the text gets created/stored in the application directly? Is there any parameter or so to tell the page item how to set the line delimiter?
Categories: DBA Blogs

Will Oracle automatically lock the table stats of one schema?

Tom Kyte - Tue, 2021-04-27 15:46
Hi Tom, Recently, we found that our database had a slow performance. After checking the table stats, we found that most of the table stats of one schema was locked while other schema were not. And I have to unlocked all the table stats and regather those table stats manually. SQL> select count(*) from user_tables; COUNT(*) ---------- 311 SQL> select table_name from user_tab_statistics where stattype_locked is not null; COUNT(*) ---------- 285 SQL> Here's my questions: 1) Will oracle automatically lock the table stats of some certain schema or not? 2) If someone locked the table stats manually, how could we find out when he/she did this (the audit_trail is set to NONE)?
Categories: DBA Blogs

Convert CrLf to Lf with utl_file.put_line

Tom Kyte - Tue, 2021-04-27 15:46
Hi, Tom! I have next pl/sql code for export of data from oracle to file in format of raw: CREATE OR REPLACE PROCEDURE my_proc_export_to_csv is begin declare file_type utl_file.file_type; cursor row_cur is select * from sys.my_new_dir; data_export sys.my_new_dir%rowtype; begin file_type:=utl_file.fopen('MY_DIR','DATA_EXPORT.RAW','w'); open row_cur; loop fetch row_cur into data_export; exit when row_cur%notfound; dbms_output.put_line(data_export.contact_id||' '||data_export.phone); utl_file.put_line(file_type,data_export.contact_id||' '||data_export.phone); end loop; close row_cur; utl_file.fclose(file_type); end; end my_proc_export_to_csv; when I exported file and opened it, I saw at the end of the line crlf: 1313131 HoldersInCure4 CrLf but i need it in Lf: 1313131 HoldersInCure4 Lf how i can get it? Help me plz.
Categories: DBA Blogs

Partitioning existing tables

Tom Kyte - Tue, 2021-04-27 15:46
I am attempting to partition a Table T1 with existing data. Table T1 is as follows: COLUMN DATATYPE ----------------- COLUMN1 NUMBER PK COLUMN2 NUMBER COLUMN3 NUMBER I am using this approach: 1- ALTER TABLE T1 RENAME TO T1_TEMP 2- CREATE TABLE T1 ( COLUMN1 NUMBER, COLUMN2 NUMBER, COLUMN3 NUMBER) PARTITION BY HASH (COLUMN1) ( PARTITION P1 TABLESPACE T1, PARTITION P2 TABLESPACE T1 ); 3- INSERT INTO T1 SELECT * FROM T1_TEMP 4- DROP TABLE T1_TEMP CASCADE CONSTRAINTS The problem with the above method is that I have tables T2, T3, Tn with a foreign key reference on COLUMN1 of T1. The reference is automatically moved to T1_TEMP but not back to T1. QUESTION: --------- How to modify all references to T1_TEMP to point back to T1 after having copied the data in step 3? THANKS!
Categories: DBA Blogs

Materialize Hint not working on CLOB data in Oracle

Tom Kyte - Tue, 2021-04-27 15:46
INSERT INTO cities(state_no, city_name) VALUES (1, 'Vizag'); INSERT INTO cities(state_no, city_name) VALUES (1, 'Kakinda'); INSERT INTO cities(state_no, city_name) VALUES (1, 'Tirupathi'); INSERT INTO cities(state_no, city_name) VALUES (2, 'Hyd'); INSERT INTO cities(state_no, city_name) VALUES (3, 'Chennai'); INSERT INTO cities(state_no, city_name) VALUES (3, 'Madurai'); I have the above rows in my cities table. I have the below query WITH t1 AS ( SELECT /*+ materialize */ state_no, DBMS_XMLGEN.CONVERT(XMLAGG(XMLELEMENT(e1,city_name || ';')).extract('//text()').getclobval(),1) as col2 FROM cities group by state_no ) SELECT state_no, col2 FROM t1 my output is: 1 NULL 2 NULL 3 NULL When I use the materialize hint , I m getting all values in col2 as NULL. When I removed the hint or using the inline hint I m getting the col3 values as col2 NULL. when Materialized hint is removed. my output is : 1 ' vizag,kakinada,tirupathi' 2 ' Hyd' 3 'Chennai, Madurai' Why I m getting NULLS when using the materialize hint. What I need to do if I want to use materialize hint in this scenario. Thanks in advance
Categories: DBA Blogs

Retrieve data from Have I Been Pawned compromised password URL, create APEX REST Service

Tom Kyte - Tue, 2021-04-27 15:46
I am using Oracle Cloud Infrastructure (OCI) Autonomous Transaction Processing (ATP) I would like to be able to check for a password's existence in the Have I been pawned compromised password list without loading the file into oracle. (SHA1 encrypt password a user is trying to change to and then compare to list to see if it is in a public database of exposed passwords to warn user) They offer a url: https://api.pwnedpasswords.com/range/ that returns all password hashes (SHA1) that start with the first 5 characters provided that can be checked for the password in question. I have unsuccessfully tried various combinations to setup a web service in APEX. It works fine in Postman. I created an APEX Rest source with the https://api.pwnedpasswords.com/range/:hash link and it populates the :hash variable with a suitable hex example (21BD1). The URL returns a series of complete hex strings like: 0018A45C4D1DEF81644B54AB7F969B88D65:3 00D4F6E8FA6EECAD2A3AA415EEC418D38EC:2 011053FD0102E94D6AE2F8B83D76FAF94F6:1 012A7CA357541F0AC487871FEEC1891C49C:2 0136E006E24E7D152139815FB0FC6A50B15:3 01A85766CD276B17DE6DA022AA3CADAC3CE:3 However, it errors saying it is unable to parse it as XML or JSON. I tried manually defining the data profile as a varchar2(100), but same error. I also tried utl.http request, but APEX gave me insufficient ACL privilege's and it appears to me since I am using ATP it won't let me do that? If that would work it would be an acceptable solutions as well. BTW, I tried the livesql link this morning and it gave a bad gateway error: The connection pool named: |apex|| is not correctly configured, due to the following error(s): Exception occurred while getting connection: oracle.ucp.UniversalConnectionPoolException: Cannot get Connection from Datasource: java.sql.SQLRecoverableException: IO Error: Unknown host specified Thanks Joe
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