Server Administration :: How To Calculate Number Of Hash Keys
Mar 31, 2011
I was reading the documentation for oracle 11gr2, with reference to URL>.....
The following examples show how to correctly choose the cluster key and set the HASH IS, SIZE, and HASHKEYS parameters. For all examples, assume that the data block size is 2K and that on average, 1950 bytes of each block is available data space (block size minus overhead).Note that 34 hash keys are assigned for each data block
how they arrive at 34 hash keys because another portion of the document states
This space determines the maximum number of cluster or hash values stored in a data block. If SIZE is not a divisor of the data block size, then Oracle Database uses the next largest divisor.
if that is the case, then number of hash keys should be 1900/55 = 34.55 which should have rounded up to 35.
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Mar 13, 2012
While trying partition exchange feature of Oracle with 2 hash partitioned tables, I come to know that I can't directly exchange partitions between 2 partitioned tables
I have two hash partitioned tables , so to move partition data from one table to another will include-
1) Exchange from partitioned table to non-partitioned table.
2) exchange from non-partitioned table to new partitioned table.
But I am not sure in which hash partition my data will go in new partitioned table (data need to be moved has single key value on basis of which tables are partitioned),
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Nov 17, 2011
Is there any way I can calculate percentage of space used in a block.Eg if a table size is 100 blocks,How Can I check the percentage of used space in block.
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Jul 28, 2011
I need to resize my datafile as i have allocated more space and need to reduce ( i.e.data load completed now). my tablespace is having 11.74 gb free space now. it has 3 datafile.
TABLESPACE TOTAL USED FREE PCT_FREE LARGEST FRAGMENTS
------------------------ ---------- ---------- ---------- ---------- ---------- ----------
CFC_DATA 150528 138780.6 11747.4 7.80412946 1251 992
TABLESPACE_NAME FILE_ID FILE_NAME Size(MB)
------------------ ---------- ------------------------------------------------------- ----------
CFC_DATA 71 +DATA/dedw/datafile/cfc_data.4074.731085435 65535.9688
CFC_DATA 334 +DATA/dedw/datafile/cfc_data.4473.757566557 20480
CFC_DATA 1710 +DATA/dedw/datafile/cfc_data.2012.728095695 64512I used below script to find out HWM in order to resize the datafile.
db_block_size is 16KB.
[code]....
in TOAD, we have an option, that is "Minimum size" button against each datafile.. Need the SQL which is running behind when we press this button from TOAD ?
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Apr 15, 2011
I have read following statement from a link [URL]...
Oracle Database XE can be installed on any size host machine with any number of CPUs (one database per machine), but XE will store up to 4GB of user data, use up to 1GB of memory, and use one CPU on the host machine.
calculation of this 4GB size. how can we calculate this size?
by simply going to DBF file and seeing their size?
or
by exporting dump and seeing the size of that dump?
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May 17, 2011
is there any query to find number of primary keys present in a table.
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Dec 15, 2011
I have to procedure that computes number of project, and average working hours of employees where employee id is passed as a parameter to the procedure. If the average working hours is less than 10 then employee's salary remain the same, otherwise check if number of project is less than 4 then 5% of salary, else 10% of salary is added to the salary.
my tables are:
CREATE TABLE employee(
empid number(5),
empname varchar(20),
address varchar(20),
no_of_dependents number(5),
deptno number(5),
CONSTRAINT EMPLOYEE_PKEY PRIMARY KEY(empid),
CONSTRAINT EMPLOYEE_FKEY FOREIGN KEY(deptno) REFERENCES department(deptno));
[code]...
the problem is i have to use only 2 cursors - 1 for select and 1 for update.
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Sep 27, 2010
setting up the query/correcting the syntax below so that it calculates the 'number of days difference' between whatever the 'Biggest Date' field value is and whatever the 'current date' is using the 'sysdate'. So far, I've only managed to get the query to calculate the number of days difference (days past due) between the 'need date' and 'estimated delivery date'.
CODESELECT
To_Date(need_date, 'YYYYMMDD') Need_Dt,
To_Date(Case when estimated_delivery > ' ' THEN estimated_delivery ELSE need_date END, 'YYYYMMDD') Biggest_Date,
To_Date(need_date, 'YYYYMMDD') - To_Date(Case when estimated_delivery > ' ' THEN estimated_delivery ELSE need_date END, 'YYYYMMDD') Date_Diff
FROM tableT
WHERE
need_date <= (Case when estimated_delivery > ' ' THEN estimated_delivery ELSE need_date END)
ORDER BY Date_Diff ASC
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Apr 9, 2013
I need the query to calculate minutes from difference of to number fields. Test case is as below.
DROP TABLE tmp;
CREATE TABLE tmp
(
code NUMBER(4),
stime NUMBER(4,2),
otime NUMBER(4,2)
)
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL
NOMONITORING;
[code]......
CODE STIME OTIME
---------- ---------- ----------
1065 20 19.49
1082 20 18.57
1279 19.3 18.59
2075 19.3 15.32
Required output is
CODE STIME OTIME HR_MIN MINUTES
---------- ---------- ---------- ------------- --------
1065 20 19.49 00 HR 21 MIN 21
1082 20 18.57 01 HR 03 MIN 63
1279 19.3 18.59 00 HR 31 MIN 31
2075 19.3 15.32 03 HR 58 MIN 238
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Feb 17, 2010
I want Oracle stored function/procedure to calculate number of working days between two dates. We need to exclude Firdays and Saturdays as there are weekend holidays and also exclude official holidasy that lie between two dates.
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Dec 5, 2012
there restrictions in number of defining role in oracle?
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Apr 19, 2010
I have two oracle 9i databases A and B with complete equal schema. Only the data is different. I want to import all table data from A to B. The problem is that there are duplicate primary keys. Therefore I want to insert data with new primary keys (all referencing tables are concerned too).
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Aug 12, 2013
How to find the number of users logged, in a database level(Oracle), b'coz generally in OS level (Linux) , the command will be '$ users',
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Mar 31, 2012
①SQL> SELECT OBJECT_ID FROM DBA_OBJECTS WHERE OBJECT_NAME='T2012';
OBJECT_ID
---------
57082
②SQL> SELECT HEADER_BLOCK,BLOCKS FROM DBA_SEGMENTS WHERE SEGMENT_NAME = 'T2012';
HEADER_BLOCK BLOCKS
------------- --------
683 8
③SQL> SELECT DBMS_ROWID.rowid_block_number(ROWID)USED_BLOCK_NUMBER FROM SCOTT.T2012;
USED_BLOCK_NUMBER
----------------
684
④SQL> SHUTDOWN IMMEDIATE;
⑤SQL> STARTUP;
⑥SQL> SELECT BLOCK#,CLASS# FROM V$BH WHERE OBJD = '57082';
no data found
⑦SQL> SELECT * FROM SCOTT.T2012;
ID
-----
1
⑧SQL> SELECT BLOCK#,CLASS# FROM V$BH WHERE OBJD='57082';
BLOCK# CLASS#
------- ----------
686 1
684 1
687 1
685 1
688 1
683 4
⑨SQL> SELECT EMPTY_BLOCKS FROM DBA_TABLES WHERE TABLE_NAME='T2012';
EMPTY_BLOCKS
------------
3
QUESTIONS ONE:
in the ⑧ step,why block#685,block#686,block#687,block#688 in the buffer cache after i query data from scott.T2012?
QUESTIONS TWO:
in the ⑨ step,what's the block number of the empty block?just like DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID).
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Aug 27, 2013
How to determine number of connections establishing from application server to database server for a particular user and also query the user is running in database.
user -- application user created in database.
same user exist in application.
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Feb 6, 2013
When I created a new oracle database the port number was 1521 (default), but I want to change it to 1522.
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Dec 27, 2011
I have taken database backup using exp command and when I try to import in other pc the foreign keys are not imported. It saying error message that no matching unique key or primary key for this column.
how will i take backup including with primary keys?
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May 12, 2011
I received the below error while importing the dump file.
IMP-00017: following statement failed with ORACLE error 2298:
"ALTER TABLE "tab1" ENABLE CONSTRAINT "TSK_FK""
IMP-00003: ORACLE error 2298 encountered
ORA-02298: cannot validate (bala.TSK_FK) - parent keys not found
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May 2, 2012
how many maximum connection, a particular user can have in oracle. and how many maximum connection if user has 'resource profile' as default.and i am using oracle 11.2.0.1.0
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Feb 25, 2012
We have two tablespace xyz_ts & pqr_ts having 167 datafiles . We have to reduce this number of files. These tablespace having 580 GB size .
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Jul 17, 2012
SQL> select checkpoint_change#,controlfile_change# from v$database;
CHECKPOINT_CHANGE# CONTROLFILE_CHANGE#
------------------ -------------------
203454 204955
what's the difference between checkpoint_change# and controlfile_change#.
what's the checkpoint_change# use for ? does it use for recover ?
what's the controlfile_change# use for ?
when the controlfile_change# will be increase ?
SQL> select controlfile_sequence# from v$database;
CONTROLFILE_SEQUENCE#
---------------------
293
Qs.) what is controlfile_sequence# ?
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Aug 9, 2013
To investigate further on this error ,i want to find how many user connections got established during the error time and their details like machine,username,program,status etc in database ?
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May 4, 2012
is there any view in oracle for getting the total number of processes and currently used process in oracle? i am using oracle 11.2.0.1.0.
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Mar 28, 2012
We are facing a different issue in our database. From yesterday night, the archive log generated with 5 digit. But it supposed to be 6 digit. Hence we are not able to apply the logs in DR Location.
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Oct 1, 2012
i am getting ORA-00059:maximum number of DB_FILES exceeded, so i used following on one node
SQL> alter system set db_files=700 scope=spfile; system altered.
now do i need to re-bounce(restart) the db.
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May 7, 2010
We are facing one issue on one of the database. The database is generating large trace files(14000) from last two days. That consumes around 15G space on the disk. And the content of the trace files is not having any meaningful message to debug:
cat /apps/oracle/admin/fs90uat/bdump/fs90uat_p050_23966.trc
*** TRACE DUMP CONTINUES IN FILE /apps/oracle/admin/fs90uat/bdump/fs90uat_p050_23966.trc ***
Dump file /apps/oracle/admin/fs90uat/bdump/fs90uat_p050_23966.trc
*** TRACE DUMP CONTINUED FROM FILE /apps/oracle/admin/fs90uat/bdump/fs90uat_p050_23966.trc ***
... (Many lines with above message)
The alert log is having one repeated error yesterday:
Thu May 6 22:00:03 2010
Errors in file /apps/oracle/admin/fs90uat/bdump/fs90uat_j000_11811.trc:
ORA-12012: error on auto execute of job 2647927
ORA-04063: ORA-04063: package body "ORACLE_OCM.MGMT_DB_LL_METRICS" has errors
ORA-06508: PL/SQL: could not find program unit being called: "ORACLE_OCM.MGMT_DB_LL_METRICS"
ORA-06512: at line 1
The corresponding trace file is having error:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /apps/oracle/product/10.2.0/db_1
System name: SunOS
Node name: corpqadb30
[Code] .......
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May 25, 2010
We have quite a number of sessions in database MES (production) coming from another machine.
From v$session, the program is oracle@WID27 (TNS V1-V3). This WID27 (hostname) consists of quite a number of development databases inside. We have to trace which jobs are actually triggering this, as WID27 are not suppose to connect to production databases.
How can we tell whether the sessions came in is from dblink or from the machine itself?
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Aug 1, 2011
when we ran SELECT statement against CUBE, we got below wait event: resmgr: cpu quantum.Further, we checked below 2 parameters :
NAME VALUE
------------------------- --------------------------------------------------
resource_limit TRUE
resource_manager_plan SCHEDULER[0x12B943C]:DEFAULT_MAINTENANCE_PLAN
[code]....
It has been found that these sessions did not get enough CPU to process the request. how to find out how many CPU has been allocated to this database ?
> uname -a
Linux dukedmts03db02.corp.cox.com 2.6.18-128.1.16.0.1.el5 #1 SMP Tue Jun 30 16:48:30 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
how to analyze how much % of CPU being utilized for a specific session ?
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Jul 29, 2011
In our development database, we have created 5 dimensions and a cube with 2 measures in OLAP. All these are mapped to relational tables. When we try to load this cube (MAINTAIN CUBE option from AWM) we are getting this below error:
An error has occurred on the server
Error class: Express Failure
Server error descriptions:
INI: error creating a definition manager, Generic at TxsOqConnection::generic<BuildProcess>
INI: XOQ-01600: OLAP DML error "ORA-35571: The maximum number of load errors has occured." while executing DML
[code].....
What are the database parameter i should look for as a DBA ?
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Nov 18, 2011
Need to find out what the maximum number of concurrent logins are over a period of 1 month. We need to do this as we may need to buy more licences.
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