Server Administration :: Time Remaining To Complete Table Statistics?
Jan 16, 2012
I use the following query to find out the remaining time to complete the table statistics which is running currently.
SELECT SID, SERIAL#, opname, SOFAR, TOTALWORK,username,context,
ROUND(SOFAR/TOTALWORK*100,2) COMPLETE
FROM V$SESSION_LONGOPS
WHERE
TOTALWORK != 0
AND SOFAR != TOTALWORK
order by 1;
SOFAR column shows 9325 and totalwork column shows 12287.How to calculate the columns in terms of hours and minutes ?
And also sometime the query never shows the output of the query for the current running query.
I want to get the stale stats for Table resides at APPS schema. Is there is any table or view exists to get the details like DBA_STALE_STATS or anything? Currently I am checking LAST_ANALYZED column from DBA_TABLES?
Why do we gather table statistics manually ?Is it because of database performance.
I know In Oracle Database 10g, Automatic Optimizer Statistics Collection reduces the likelihood of poorly performing SQL statements due to stale or invalid statistics and enhances SQL execution performance by providing optimal input to the query optimizer.
Optimizer gathers statistics when 10% table rows have been changed.
I am connect to remote database with a user named 'TEST', this user has dba privileges. I am not able to gather the statistics of neither test schema nor for any table that exists in this schema.
SQL> EXEC dbms_stats.gather_schema_stats('TEST', cascade=>TRUE); BEGIN dbms_stats.gather_schema_stats('TEST', cascade=>TRUE); END; * ERROR at line 1: ORA-44004: invalid qualified SQL name ORA-06512: at "SYS.DBMS_STATS", line 13210 ORA-06512: at "SYS.DBMS_STATS", line 13556 ORA-06512: at "SYS.DBMS_STATS", line 13634 ORA-06512: at "SYS.DBMS_STATS", line 13593 ORA-06512: at line 1
I am using imp / Schema level. Dump file contains 3 schemas with 120 GB size.Imp is running now. How to find completion time. So that I can inform to application developer about activity completion time.
if there are any problems with updating statistics? My manager told me that they had big performance issue when they updated the statistics of whole database. Is this a rare case?
I know the advantages of updating statistics,but are there any dis-advantages?
I'm getting a "TNS disconnect" after database creation script creation in DBCA. Haven't figured out what's going on. I'm attempting to create a 2nd database on one linux 64 server. I get all the way through DBCA, but it won't go the final mile. Any thoughts? I've tried setting the port to a different port from the existing LISTENER, creating a LISTENER2 and associating it with the 2nd instance.
I am looking at a performance issue at the moment and trying to replicate on a test system. I am initially looking at the impact of upto-date statistics on the main schema's objects.
For this I wanted to:
first run the batch with whatever stats were present in the database Flashback the db to before the batch . Gather stats Re-run the batch with updated stats and compare results.
However, I inadvertently ran the stats job before running the load the first time! I have the SCN from when the environment was set up like production (ie before the stats were run) so am I correct in saying that if I flashback to this point then the stats will be "old" and I can just run the batch then? I know I can verify this when I Flashback the database by looking at LAST_ANALYZED on tables etc but it would be good to know this before hand as it's a 12 hour batch.
In a flat file 50000 records are there.In that some of the records having special charcters.From that special character record the remaing records are not loading to oracle tables. to load the remaining records,after the record which is having special characters.The data is loading using sql*loader
what does mean VERSION_TIME column in V$DATABASE;i know that there is an other column which is called CREATED which indicates when the database has been created and i think it will never change,but, what about VERSION_TIME ? when does it change ?
I have an AWR report based on two snapshots one an one hour time window, under the "SQL ordered by Elapsed Time" section, there is a query having Elapsed Time = 7012 seconds, which is almost two hours, how is this possible? I have been told that this i aggregate value of all sessions.
We have a table in the client database that has two columns - column parent and column child. The whole hierarchy of DB table dependencies is held in this table.If Report 1 is dependent on Table A and Table A in turn is dependent on two tables Table M and Table N. Table N is dependent on table Z it will appear in the db table as,
Hierarchy Table Parent Child Report1Table A Table ATable M Table ATable N Table NTable Z
Requirement :
From the above structure, we need to build a table which will hold the complete hierarchy by breaking it into multiple columns.The o/p should look like this
-ParentChild 1Child 2 Child 3 -Report1Table ATable M -Report1Table ATable N Table Z
Child 1, Child 2, Child 3 ....and so on are columns.The number of tables and the no of hierarchical relationships are dynamic.
SQL Statements to create hierarchy table:
create table hierarchy (parent varchar2(20), child varchar2(20)); insert into hierarchy values ('Report1','Table A'); insert into hierarchy values ('Report1','Table B'); insert into hierarchy values ('Table A','Table M'); insert into hierarchy values ('Table B','Table N'); insert into hierarchy values ('Report2','Table P'); insert into hierarchy values ('Table M','Table X'); insert into hierarchy values ('Table N','Table Y'); insert into hierarchy values ('Report X','Table Z');
Approached already tried :
1) Using indentation : select lpad(' ',20*(level-1)) || to_char(child) P from hierarchy connect_by start with parent='Report1' connect by prior child=parent;
2)Using connect by path function : select * from (select parent,child,level,connect_by_isleaf as leaf, sys_connect_by_path(child,'/') as path from hierarchy start with parent='Report1' connect by prior child =parent) a where Leaf not in (0);
Both the approaches give the information but the hierarchy data appears in a single column.Ideally we would like data at each level to appear in a different column.
I am using the client system to change the setting and the time zone differs from that of production. Even though the job is scheduled to run at 5 AM it show the start date as 6:30 PM which is the client system time.
What should be our approach when we see the disk response time is bad for a particular tablespace in database.I heard a good disk response time should be on an average 10ms.
our system admin is changing the time zone on solaris system, how can it effect my DB or as DBA what should i check before he do that and after he change the time zone. he is changing the time zone because of an issue with the DST (Daylightsaving time).
I have create a mview using a dblink with the refresh difference of every 10min. Suddenly I check the mview refresh date and time it was not getting refreshed automatically at the time interval specified.
drop MATERIALIZED view log on afccv.tbl_voicechat; drop MATERIALIZED VIEW SMSCHAT.TBL_VOICECHAT_NEW1 ; CREATE MATERIALIZED VIEW SMSCHAT.TBL_VOICECHAT_NEW1 ORGANIZATION HEAP PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS NOLOGGING STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
[code]....
I am trying to find out what is the cause of not refreshing and also googled for the same. got some link also either not linked to same problem or not cleared.. Where should i checked regarding the error cause.
i am using oracle 10g on solaris 10 os.currently archived log is generated by size wise 52 mb.i want to know whar is the best practice for archive log generation . it should be time interval or size wise.
our DB machines time is one hour ahead of Active Directory, as we sync our time with AD, is there any contribution of Database in the wrong time of solaris machines ? and for the resolution of problem, what can be checked at DB side.
We are experiencing tx row lock wait time over hours. There is no blocking session and it seems that the application hangs. What is funny is that when we gather_stats on the tables, those tx row lock wait are being released.
updating the statistics for a table (with GATER_TABLE_STATS) and using NUM_ROWS then. This works fine for me as long as I am the owner of the table, but when someone else is, I always get this error: ORA-20000: Table does not exist or insufficient privileges.what privileges do I need to use GATHER_ TABLE_ STATS on all Tables, which were created by Users?
when I tried to use ANALYZE TABLE TEST_TABLE COMPUTE STATISTICS on a certain table I got the following error: a view is not appropriate here. The strange thing is, TEST_TABLE is not a view (at least it is not listed in ALL_VIEWS and is listed in ALL_TABLES, so it cant be a view right?).
Besides, is there another way to gather Table Statistics (not using Analyze Table or Gather_Table_Stats)?
I have a table which have 300+ columns and have 13 million rows. It is on a 32 kb block size. This is a table in data ware house environment. There no# of rows in the table haven't changed much but I see that the time taken to collect statistics have increased significantly.Initially it took only 15 minutes (with the same 13M rows) now it runs for 4+ hours. The max parallel servers is 4 (which is unchanged). The table is not partitioned.
OS: HP UX Itanium Database: Oracle 11g (11.2.0.2)
Command is: exec dbms_stats.gather_table_stats(ownname=>'ABC',tabname=>'ABC_LOAD',estimate_percent=>dbms_stats.auto_sample_size,cascade=>TRUE,DEGREE=>dbms_stats.auto_degree);
I would like to understand:
1) What could have been the causes of this change in time. 15 minutes to 4+hours ? 2) How can we gather statistics of huge table at a faster rate?
