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How to generate execution plan created from AWR snapshot?
Using $ORACLE_HOME/rdbms/admin/awrsqrpt.sql one can generate execution plan from AWR by passing start snap id, end snap id and SQL ID.… READ MORE
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How to reboot CentOS in single user mode to reset root password?
If you have forgotten the root password and you need to reset it on CentOS, one can reset it by… READ MORE
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Example of bulk collect and performance using different values of limit
Sample code that shows using BULK COLLECT and performance of using different values for LIMIT. declare cursor l_cur is select… READ MORE
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How to set vim/gvim on windows?
Using the following steps one can setup vim/gvim to run on windows. 1) Add the following new variable VIM on… READ MORE
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Example of using tracefile_identifier
Using “tracefile_identifier” Oracle will add that to the name of the user’s trace filename so the file can easily be… READ MORE
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How to add a comment when changing a parameter?
In “ALTER SYSTEM” one can include a comment which gets recorded in the spfile and also in v$parameter as shown… READ MORE
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How to use dbms_xplan to display execution plan?
Using dbms_xplan.display_cursor one can see the execution plan of a SQL statement. The function takes following 3 parameters. SQL_ID (VARCHAR2)… READ MORE
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How to add a new not null column in a table without providing a default value?
The following shows how to add in a table a new column that is NOT NULL when a table already… READ MORE
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How to check if auditing is turned on and privilege auditing is turned on?
If AUDIT_TRAIL is not set to NONE then using the following SQL one can find the statements that have auditing… READ MORE
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How to find and enable/disable parallel DML, DDL, Query?
In the view v$session there are columns that can tell if parallel DDL, DML, Query is enabled/disabled. PDML_ENABLED and PDML_STATUS… READ MORE
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How to use PRAGMA EXCEPTION_INIT?
PRAGMA EXCEPTION_INIT – allows one to map ORA- error and it can be raised in PL/SQL code. The SQL Error… READ MORE
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How to schedule a snap for STATSPACK?
One can automate taking of snapshots of STATSPACK by executing DBMS_JOB or by scheduling it through crontab. Schedule automatic STATSPACK… READ MORE
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How to delete or truncate Statspack data?
One can truncate data in STATSPACK or delete range of snaps stored. To truncate STATSPACK data Using $ORACLE_HOME/rdbms/admin/sptrunc.sql, one can… READ MORE
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How to gather stats without histograms?
When passing method_opt as 'FOR ALL COLUMNS SIZE 1', it means no histogram is collected for columns on the table(s).… READ MORE
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A utility to change oracle schema password using Java
The following java standalone program can be used to change Oracle password. It uses the OCI calls to change the… READ MORE
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Script to automate generation AWR for a day
— The following anonymous PL/SQL code can be used to generate a script which can be run to generate AWR… READ MORE
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How to view/change statistics retention and space used to store stats history?
See the oldest statistics history available SQL> SELECT DBMS_STATS.GET_STATS_HISTORY_AVAILABILITY FROM DUAL; GET_STATS_HISTORY_AVAILABILITY ————————————————————————— 25-OCT-11 10.00.55.093000000 PM -07:00 See the stats… READ MORE
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How to restore statistics and view statistics history?
Shows in this scenrio there are backup of stats that exists for SCOTT.TEST table SQL> select * FROM DBA_TAB_STATS_HISTORY where… READ MORE
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How to view 10053 trace?
To view output from 10053 using the following link one can download software which allows one to review the output… READ MORE
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How to fix a scenerio when the datafile was removed before dropping the tablespace?
Ran into following issue were accidentally the datafile was removed before dropping the tablespace. If not fixed this can cause… READ MORE
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How to find the queue_depth of a lun based filesystem on AIX?
# Displays information of all volume group, in the following example vb_TESTDB_data1 is one of the oracle filesystem /home/oracle $… READ MORE
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