SQL & PL/SQL :: By Default Buffer Size?
Apr 30, 2013What is By Default Buffer size in Oracle ......?
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PL/SQL :: Increase Buffer Size Of Dbms_output.put_line
Feb 28, 2013I am executing a plsql procedure and trying to increase buffer size to display all characters, procedure is given below:
create or replace procedure prc_p(prm_t1 in VARCHAR2,
prm_t2 in VARCHAR2,
prm_tab in varchar2
)
AUTHID CURRENT_USER
as
str_sql VARCHAR2 (4000);
[code]..........
Buffer Cache Size Consume Full SGA_target
Jun 14, 2013If sga Buffer Cache Size consume full of SGA_target size, if possible that it will cause performance any issue. I am facing CPU 100% consuming while single query execute, Which query generate monthly report data.
I have two question
1)How to fix the CPU 100% consuming
2)How to find total number user hit oracle specific schema.
Oracle 10.2.0.5 Standard
Sga_target : 14G
Sga_max :20G
Pga :3G
Below SGA details
NAME BYTES/1024/1024
-------------------------------- ---------------
Fixed SGA Size 2.01795197
Redo Buffers 13.9804688
Buffer Cache Size 13632
Shared Pool Size 640
Large Pool Size 16
Java Pool Size 16
Streams Pool Size 16
Granule Size 16
Maximum SGA Size 20480
Startup overhead in Shared Pool 208
Free SGA Memory Available 6144
Precompilers, OCI & OCCI :: ORA-01044 / Size 25600000 Of Buffer Bound To Variable Exceeds Maximum
Oct 9, 2009I am binding parameters using obndra to Package. while executing with oexec it is giving error "ORA-01044: size 25600000 of buffer bound to variable exceeds maximum"
I am getting this error in Shared server only.In dedicated server it is working.
Difference Between Cache Buffer Chain Latch And Buffer Busy Wait
Jul 30, 2012Does cache buffer chain latch and buffer busy wait event are related to one any another.
Latch definition from Google says : Latches are simple, low-level serialization mechanisms to protect shared data structures in the system global area (SGA).
what does it mean my protect. Does this mean protects from aging as per LRU algorithm and getting removed from SGA
or
protect from other processes ,say from example from simultaneously DML operations.
or
both
Does buffer busy wait event occurs , because of the cache buffer chain latch ?
SQL & PL/SQL :: Default Values / Distinguishing Between Passed And Default Nulls
Nov 16, 2010I was looking for a way to see if a default value for a procedure was passed NULL or it got NULL by default. [URL]
View 11 Replies View RelatedServer Utilities :: Estimate Size Of FlatFile Based On Table Size?
May 8, 2013We are planning to export the table data to a file pipedelimited. How do i estimate the size of the FlatFile based on the table size? or avg rowlength
View 3 Replies View RelatedServer Administration :: How To Reduce Size Of TEMP DBF File Size
Apr 13, 2011I am using oracle 8.1.5 database and my temp01.dbf file size is increased upto 19.8 GB now i want reduce its size .
View 13 Replies View RelatedBuffer Used In Export?
Apr 12, 2013I would like to know the buffer size using by our dba when he set export?
I know that it's possible to define it when we realize the export but its possible to know this value after export?
There's a sql*plus command to find this value?
N.B : we dont have documentation
Its for an urgent need.
Buffer Chain Latches
Oct 25, 2010I have a few questions and doubts regarding to cache buffer chains and lru chains.
1. What can possibly cause the cache buffers chain ?
2. Can it be resolved by increasing the free lists and increasing the inittrans of the block after identifying the hot buffers? (The table spaces are not a ASSM.)
3. How can we classify where the cache buffer chain is caused? Is there anything like extent level, header level? ( i don't understand this part due to the reason i see many operations against cache buffer chain event in stats pack reports).
4. Is cache buffer chain is related to the cache buffers chain event too?
5. In such case, tuning either of the contention will resolve the other if both exists?
Buffer Gets And Logical Reads?
Jun 27, 2012Does the counter of event buffer gets include the logical reads ? Does the mertic buffer gets include the event of reading from undo buffer ?
View 4 Replies View RelatedPL/SQL :: How To Use The UTL File And Buffer In Procedure
Jan 10, 2013/* Formatted on 2013/01/10 16:22 (Formatter Plus v4.8.6) */
CREATE OR REPLACE PACKAGE pk_batch_feds
AS
[Code]....
Data Buffer Cache
Feb 22, 2013how can we check the size of data buffer cache.
View 7 Replies View RelatedBuffer Cache Hit Ratio For A Database
May 20, 2013what will be best buffer cache hit ratio for a database for good performance
note : in general
Query Parsing And Buffer Cache?
Apr 18, 2012I want to know what exact process happens in oracle architecture when an update query is fired.
View 1 Replies View RelatedSQL & PL/SQL :: Character String Buffer Too Small?
Dec 14, 2012I'm trying to create a table with a select statement. I want to populate this new table with the aggregated value from a VIEW. Following is the code used for creating the VIEW,
create or replace view FINAL_WEB_LOG
as
select SESSION_ID,
SESSION_DT,
C_IP,
CS_USER_AGENT,
tab_to_string(CAST(COLLECT(web_link) AS t_varchar2_tab)) WEBLINKS
from web_views_tab
group by C_IP, CS_USER_AGENT, SESSION_DT;
I want to create a table with WEBLINKS and SESSION_ID which is a sequence from another table.
CREATE TABLE FINAL_WEB
AS
SELECT weblinks
FROM final_web_log
UNION
SELECT session_id
FROM WEB_VIEWS_TAB;
This now gives me the following error,
SQL Error: ORA-06502: PL/SQL: numeric or value error: character string buffer too small
This has to do with the field, Weblinks, it does have longer values.
SQL & PL/SQL :: ORA-20000 / ORU-10027 - Buffer Overflow?
Oct 7, 2010I am running script which drop all public synonyms and create private synonyms for all eligible objects. I am passing value to procedure through cursor and I am using dbms_output.
ERROR at line 1:
ORA-20000: ORU-10027: buffer overflow, limit of 999999 bytes
ORA-06512: at "SYS.DBMS_OUTPUT", line 32
ORA-06512: at "SYS.DBMS_OUTPUT", line 97
ORA-06512: at "SYS.DBMS_OUTPUT", line 112
ORA-06512: at line 101
I read that by: SET SERVEROUTPUT ON SIZE unlimited would resolve this problem.
What are the effects?Do I need to check any disk space, or any effect on the memory?
Forms :: Storing A Value In Copy BUFFER
Aug 25, 2013is there any method to store a value in "copy buffer" ?
I mean, for example, if i have defined a global varaiable as
Quote::global.name := 'orafaq';
Then what i need is a command something like:
windows_copy_buffer := :global.name ;
So that later on when i press control+v, then it paste the word "orafaq".
Dirty Versus Redo Buffer?
Mar 3, 2010What's the difference between a dirty buffer and a redo buffer?
My understanding is that a dirty buffer is a changed buffer or whenever data changes in the buffer cache, it's marked as dirty. Also, a redo buffer keeps track of changes that were made to the data, so it's also referring to changed data as well...DWBn writes dirty buffers to disk and LGWR writes redo data to redo log filesHow can we differentiate between the two?
Server Administration :: Redo Log Buffer Using?
May 27, 2011I learnt that logWriter writes in the redo log files when redo log buffer is 1/3 full, it means that 66 % of redo log buffer are always empty and never used,
if no, isn't a waste of memory (66 % always empty !)
Script For Monitoring Database Buffer Cache
Mar 26, 2012give a script to find how much my db buffe cache and redo log buffer cache is used and how much is free.
View 1 Replies View RelatedBuffer Cache Hit Ratio Is Low In Oracle 9i After Maintenance
Mar 3, 2011Database : 9.2.0.7
Os : windows 2003 sevrer standdard edition
RAM 4 Gigs
The buffer cache hit ratio in this server is around 83%, where it normaly was around 98% before i did some maintenance activities.
I have done some maintenance activities in January on this database.
Maintenance activties includes below steps
1.In production i have deleted old data in the production tables
2.Reorganized tablespaces,tables
3.Rebuild indexes for those tables.
4. At last collected statistics for those tables.
Now after this activity the buffer cache hit ratio is very low.
Executed Procedure - Buffer Overflow Error
Nov 16, 2011when i am executing the procedure, i am getting the below error.
I have added below lines in the procedure.
DBMS_OUTPUT.ENABLE(100000);
Even though i am getting the error.
ORA-20000: ORU-10027: buffer overflow, limit of 100000 bytes
ORA-06512: at "SYS.DBMS_OUTPUT", line 32
ORA-06512: at "SYS.DBMS_OUTPUT", line 97
ORA-06512: at "SYS.DBMS_OUTPUT", line 112
ORA-06512: at "Procedure name", line 199
ORA-06512: at line 1
20000. 00000 - "%s"
*Cause: The stored procedure 'raise_application_error' was called which causes this error to be generated.
*Action: Correct the problem as described in the error message or contact the application administrator or DBA for more information.
Buffer Overflow Limit Of 2000 Bytes
Jul 14, 2011I got a below error while running a procedure!
ORA-20000: ORU-10027: buffer overflow, limit of 2000 bytes
at that time i am using below parameters in that script:
set serveroutput on size 1000000
DBMS_OUTPUT.ENABLE(1000000);
But still getting same error.. how can i resolve this issue..
Performance Tuning :: Increasing Buffer Cache Value
Nov 30, 2012Considering the below factors, I am planning to increase the buffer cache value from 256Mb to 512Mb.
1. Buffer cache hit ratio value is around 35% even in the normal period.
2. free buffer requested value is below during peak & normal hours below.
Statistic Total per Second per Trans
--------------------------------- ------------------ -------------- ------------
free buffer requested 54,694,995 15,226.9 2,523.7
free buffer requested 23,412,674 6,501.7 2,585.9
3. most of the top 5 physical reads & logical reads queries are well tuned and some of queries are doing FTS on small tables (table count min 1500 max 35000). SO indexing option is not required for these queires. But these queries getting executed frequently.
SQL> show sga
Total System Global Area 2148534928 bytes
Fixed Size 731792 bytes
Variable Size 1879048192 bytes
Database Buffers 268435456 bytes
Redo Buffers 319488 bytes
5.top 5 waitevents during db slow performance & high cpu utilization (>80%) issue.
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~ % Total
Event Waits Time (s) Ela Time
-------------------------------------------- ------------ ----------- --------
latch free 1,848,898 153,793 52.00
buffer busy waits 395,280 87,201 29.49
db file scattered read 3,488,648 34,199 11.56
enqueue 4,052 10,897 3.68
CPU time 5,567 1.88
6. Top 5 waitvents during normal activities and CPU utilization is around 40%.
Top 5 Timed Events
~~~~~~~~~~~~~~~~~~ % Total
Event Waits Time (s) Ela Time
-------------------------------------------- ------------ ----------- --------
CPU time 1,860 45.32
db file scattered read 1,133,669 985 23.99
imm op 776 605 14.73
sbtinfo2 208 139 3.40
sbtbackup 2 123 3.00
Performance Tuning :: Flushing Buffer Cache
Sep 27, 20101) Is shutting down the DB flush all the data buffers, from the buffer Cache?
2) In any oracle version, do we have any way to flush only the buffer Cache.
Performance Tuning :: Buffer Busy Wait?
Dec 20, 2011I noticed oracle background process ora_fbda_padwsdpr is suffering from buffer busy wait. When i further finding the object, it was on SYS_FBA_FA tables.
what is this is causing BUFFER BUSY WAIT. Also to add we have disabled flashback database.
Server Administration :: DELETE And Buffer Cache?
Aug 19, 20101)If i issue a DELETE statement to delete a row, will this statement drag any data from the datafile to database buffer? How is the change made by a DELETE statement recorded in buffer cache? How is this change then applied to the data in datafiles after commit?
View 7 Replies View RelatedServer Utilities :: Import With Buffer Parameter
Jan 12, 2011We are having daily syncing script which use to drop and import of one major schema.
When we do import with parameter BUFFER=209715200, it takes approximatively 4 hours & when we do without the parameter it takes 6 hours.
So i humbly request to above scenario of import process with buffer parameter in concern.
Also to expose, import is done in freeze hours.
Server Administration :: How To Know Which Objects Used Keep Buffer Cache
Mar 28, 2011How can i know which objects used keep buffer cache?
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