CBO behaviour with stale statistics

Hi,
our company sells an application based on an Oracle database. One of our customers has reported what I regard as odd behaviour from the CBO. I wonder if anyone here can confirm my understanding of how the CBO uses statistics to determine the optimal execution plan.
The reported issue is this:
There are a number of large (100 million rows+) tables in the application, these are partitioned by date and are subject to both inserts and updates although and although theoretically any date could be the subject of a change, these tend to concentrated towards the most recent dates. The customer analyses the tables with a sample size of 25% every few days. They claim that if they do not do this then the CBO starts choosing very non-optimal plans and this gets worse the longer that they leave it.
As I understand it the CBO will use the statistics on a table. Even if those statistics are stale it does not have anything better to base a decision on so it must use the statistics that are there. In which case even though a plan may be chosen that is non-optimal given a new set of data, it should choose the same plan each time given the same query and the same set of statistics.
Any thoughts?

qwe10730 wrote:
As I understand it the CBO will use the statistics on a table. Even if those statistics are stale it does not have anything better to base a decision on so it must use the statistics that are there. In which case even though a plan may be chosen that is non-optimal given a new set of data, it should choose the same plan each time given the same query and the same set of statistics.
This could be a case of the query only looking the same. As you said, most of the action is about the last few days.
If they only collect statistics every few days then as time passes they are going to be running queries about data that doesn't appear to exist.
If you have queries for a single recent partition, then Oracle could produce a plan based on its expectation of a complete absence of data. If you have queries for yesterday's data when the statistics haven't been updated since last week Oracle will produce a plan based on the fact that the volume of data is probably less than it would have been a week ago. (etc.....)
Doug Burns has started an interesting series of posts on partitioned tables and statistics - it may not cover all the details you need at present (he's only published 5 of a possible 10 posts so far). I've listed them here: http://jonathanlewis.wordpress.com/2010/03/17/partition-stats/ but the first one is here: http://oracledoug.com/serendipity/index.php?/archives/1562-Statistics-on-Partitioned-Tables-Part-1.html
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
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Thank you for the feedback.
I have manually updated the statistics on a single Table successfully and the Table has been removed from the list of stale statistics. So this is further evidence the daily Task "Optimizer Statistics Gathering Task" is failing to update stale statistics.
Any further comment or suggestion welcome
Thanks
Steve
SQL> SELECT owner, table_name, last_analyzed, num_rows
FROM dba_tables
WHERE owner = 'IGR' AND table_name = 'SYSAUDIT';
OWNER TABLE_NAME LAST_ANAL NUM_ROWS
IGR SYSAUDIT 14-DEC-11 59036
1 begin
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3 ownname=> 'IGR',
4 tabname=> 'SYSAUDIT',
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7 degree=> null,
8 no_invalidate=> DBMS_STATS.AUTO_INVALIDATE,
9 granularity=> 'AUTO',
10 method_opt=> 'FOR ALL COLUMNS SIZE AUTO');
11* end;
PL/SQL procedure successfully completed.
SQL> /
OWNER TABLE_NAME LAST_ANAL NUM_ROWS
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int
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Windows xp
SYS> select owner,table_name from dba_tab_statistics
2 where stale_stats='YES'
3 /
OWNER                          TABLE_NAME
SYS                            CON$
SYS                            UNDO$
SYS                            IND$
210 rows selected.
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Wrote file afiedt.buf
1 declare
2 objlist   DBMS_STATS.objecttab;
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3 /
OWNER                          TABLE_NAME
SYS                            WRH$_FILESTATXS
SYS                            WRH$_SQLSTAT
SYS                            WRH$_SYSTEM_EVENT
SYS                            WRH$_WAITSTAT
SYS                            WRH$_LATCH
SYS                            WRH$_LATCH_MISSES_SUMMARY
SYS                            WRH$_DB_CACHE_ADVICE
SYS                            WRH$_ROWCACHE_SUMMARY
SYS                            WRH$_SGASTAT
SYS                            WRH$_SYSSTAT
SYS                            WRH$_PARAMETER
OWNER                          TABLE_NAME
SYS                            WRH$_SEG_STAT
SYS                            WRH$_SERVICE_STAT
SYS                            WRH$_ACTIVE_SESSION_HISTORY
SYS                            WRH$_TABLESPACE_STAT
SYS                            WRH$_OSSTAT
SYS                            WRH$_SYS_TIME_MODEL
SYS                            WRH$_SERVICE_WAIT_CLASS
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regards.

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SYS> select table_name,last_analyzed
2 from dba_tables
3 where owner='SYS'
4 and table_name like 'WRH$%'
5 order by 2;
TABLE_NAME                     LAST_ANALYZED
WRH$_ACTIVE_SESSION_HISTORY_BL 09-aug-2010 15:32:33
WRH$_BUFFERED_QUEUES           09-aug-2010 15:32:33
WRH$_BUFFERED_SUBSCRIBERS      09-aug-2010 15:32:34
WRH$_COMP_IOSTAT               09-aug-2010 15:32:34
WRH$_CR_BLOCK_SERVER           09-aug-2010 15:32:34
WRH$_CURRENT_BLOCK_SERVER      09-aug-2010 15:32:34
WRH$_DLM_MISC_BL               09-aug-2010 15:32:35
WRH$_DLM_MISC                  09-aug-2010 15:32:35
WRH$_DB_CACHE_ADVICE_BL        09-aug-2010 15:32:35
WRH$_FILEMETRIC_HISTORY        09-aug-2010 15:32:36
WRH$_FILESTATXS_BL             09-aug-2010 15:32:36
TABLE_NAME                     LAST_ANALYZED
WRH$_EVENT_NAME                09-aug-2010 15:32:36
WRH$_INST_CACHE_TRANSFER_BL    09-aug-2010 15:32:37
WRH$_INST_CACHE_TRANSFER       09-aug-2010 15:32:37
WRH$_LATCH_CHILDREN_BL         09-aug-2010 15:32:39
WRH$_LATCH_BL                  09-aug-2010 15:32:39
WRH$_LATCH_CHILDREN            09-aug-2010 15:32:39
WRH$_LATCH_NAME                09-aug-2010 15:32:40
WRH$_LATCH_PARENT_BL           09-aug-2010 15:32:40
WRH$_LATCH_PARENT              09-aug-2010 15:32:40
WRH$_LATCH_MISSES_SUMMARY_BL   09-aug-2010 15:32:40
WRH$_METRIC_NAME               09-aug-2010 15:32:41
TABLE_NAME                     LAST_ANALYZED
WRH$_OSSTAT_NAME               09-aug-2010 15:32:42
WRH$_OSSTAT_BL                 09-aug-2010 15:32:42
WRH$_PARAMETER_BL              09-aug-2010 15:32:43
WRH$_PARAMETER_NAME            09-aug-2010 15:32:44
WRH$_ROWCACHE_SUMMARY_BL       09-aug-2010 15:32:46
WRH$_SEG_STAT_BL               09-aug-2010 15:32:50
WRH$_SESSMETRIC_HISTORY        09-aug-2010 15:32:53
WRH$_SERVICE_STAT_BL           09-aug-2010 15:32:53
WRH$_SERVICE_WAIT_CLASS_BL     09-aug-2010 15:32:53
WRH$_SGASTAT_BL                09-aug-2010 15:32:54
WRH$_SQLSTAT_BL                09-aug-2010 15:32:57
TABLE_NAME                     LAST_ANALYZED
WRH$_STREAMS_CAPTURE           09-aug-2010 15:33:01
WRH$_SYSMETRIC_HISTORY         09-aug-2010 15:33:01
WRH$_STREAMS_APPLY_SUM         09-aug-2010 15:33:01
WRH$_STAT_NAME                 09-aug-2010 15:33:01
WRH$_SYSSTAT_BL                09-aug-2010 15:33:05
WRH$_SYSTEM_EVENT_BL           09-aug-2010 15:33:06
WRH$_SYS_TIME_MODEL_BL         09-aug-2010 15:33:07
WRH$_TABLESPACE_STAT_BL        09-aug-2010 15:33:08
WRH$_WAITSTAT_BL               09-aug-2010 15:33:12
WRH$_ACTIVE_SESSION_HISTORY    17-aug-2010 12:42:35
WRH$_BUFFER_POOL_STATISTICS    17-aug-2010 12:42:37
TABLE_NAME                     LAST_ANALYZED
WRH$_DATAFILE                  17-aug-2010 12:42:37
WRH$_DB_CACHE_ADVICE           17-aug-2010 12:42:38
WRH$_ENQUEUE_STAT              17-aug-2010 12:42:38
WRH$_FILESTATXS                17-aug-2010 12:42:38 <<--- I do'nt know how it came i.e. from
WRH$_JAVA_POOL_ADVICE          17-aug-2010 12:42:39        Analyzed command or by dbms_stats --->>
WRH$_INSTANCE_RECOVERY         17-aug-2010 12:42:39
WRH$_LATCH                     17-aug-2010 12:42:39
WRH$_LOG                       17-aug-2010 12:42:40
WRH$_OPTIMIZER_ENV             17-aug-2010 12:42:40
WRH$_MTTR_TARGET_ADVICE        17-aug-2010 12:42:40
WRH$_LIBRARYCACHE              17-aug-2010 12:42:40
TABLE_NAME                     LAST_ANALYZED
WRH$_OSSTAT                    17-aug-2010 12:42:40
WRH$_LATCH_MISSES_SUMMARY      17-aug-2010 12:42:40
WRH$_PARAMETER                 17-aug-2010 12:42:41
WRH$_PGA_TARGET_ADVICE         17-aug-2010 12:42:41
WRH$_PGASTAT                   17-aug-2010 12:42:41
WRH$_RULE_SET                  17-aug-2010 12:42:42
WRH$_RESOURCE_LIMIT            17-aug-2010 12:42:42
WRH$_PROCESS_MEMORY_SUMMARY    17-aug-2010 12:42:42
WRH$_ROWCACHE_SUMMARY          17-aug-2010 12:42:42
WRH$_SEG_STAT                  17-aug-2010 12:42:43
WRH$_SEG_STAT_OBJ              17-aug-2010 12:42:44
TABLE_NAME                     LAST_ANALYZED
WRH$_SERVICE_NAME              17-aug-2010 12:42:45
WRH$_SERVICE_STAT              17-aug-2010 12:42:45
WRH$_SESS_TIME_STATS           17-aug-2010 12:42:46
WRH$_SGASTAT                   17-aug-2010 12:42:46
WRH$_SERVICE_WAIT_CLASS        17-aug-2010 12:42:46
WRH$_SGA                       17-aug-2010 12:42:46
WRH$_SGA_TARGET_ADVICE         17-aug-2010 12:42:47
WRH$_SHARED_POOL_ADVICE        17-aug-2010 12:42:47
WRH$_SQLSTAT                   17-aug-2010 12:42:47 <<--- But why it is in stale statistics.
WRH$_SQLTEXT                   17-aug-2010 12:42:48        Due to, i issued
WRH$_SQL_PLAN                  17-aug-2010 12:42:49        "exec DBMS_STATS.FLUSH_DATABASE_MONITORING_INFO;" ? --->>
TABLE_NAME                     LAST_ANALYZED
WRH$_SQL_BIND_METADATA         17-aug-2010 12:42:49
WRH$_SQL_SUMMARY               17-aug-2010 12:42:50
WRH$_STREAMS_POOL_ADVICE       17-aug-2010 12:42:50
WRH$_SYSTEM_EVENT              17-aug-2010 12:42:51
WRH$_SYSMETRIC_SUMMARY         17-aug-2010 12:42:51
WRH$_SYSSTAT                   17-aug-2010 12:42:51
WRH$_TABLESPACE_SPACE_USAGE    17-aug-2010 12:42:52
WRH$_SYS_TIME_MODEL            17-aug-2010 12:42:52
WRH$_THREAD                    17-aug-2010 12:42:53
WRH$_TEMPSTATXS                17-aug-2010 12:42:53
WRH$_TEMPFILE                  17-aug-2010 12:42:53
TABLE_NAME                     LAST_ANALYZED
WRH$_TABLESPACE_STAT           17-aug-2010 12:42:53
WRH$_WAITSTAT                  17-aug-2010 12:42:54
WRH$_WAITCLASSMETRIC_HISTORY   17-aug-2010 12:42:54
WRH$_BG_EVENT_SUMMARY          17-aug-2010 14:58:48
WRH$_SQL_WORKAREA_HISTOGRAM    17-aug-2010 14:58:49
WRH$_UNDOSTAT                  17-aug-2010 14:58:49
SYS>Probably, i have left today my daily external readings and by mistake entered into Oracle's internal path....!
regards.

Strange account behaviour with active sync

Hi all,
i determined a strange behaviour with Active Sync:
I deleted an Account in IDM but in the active sync log i can always see the account information??
Thnx Michael

Although, now that you are doing this
My workaround is to use an additional offscreen buffered image, do all of my rendering to that, and then at the end copy that image in one go to the drawGraphics from the buffer strategy.you no longer need to use BufferStrategy.Yes, good point. That didn't occur to me.
The way my implementation is I have a pluggable rendering strategy (i.e. the strategy pattern) where I can choose an implementation that will use the frame's bufferStrategy and drawGraphics, or my own BufferedImage back buffer. In light of what you've said I can easily change my implementation to not use the buffer strategy at all and I should save some rendering time.
I've found all sorts of weird behaviour when I use active rendering and have the OpenGL pipeline enabled (I need the pipeline enabled because I want accelerated images), e.g. even setting rendering hints can sometimes cause drawString to not output any text after the first frame.
I was really using BufferStrategy because I wanted to use hardware page flipping and sync my screen updates to the vertical blanking interval which, as it happens, I can't actually get to work - but that's a problem for another day/topic.
Anyway, I appreciate your follow-up, thanks.

FF 4 (mac) doesn't display handcursor in all Flash websites. Also all html websites show strange behaviour with cursor. (blinking cursor in nearby div after clicking a button)

I'm running Mac OS 10.6
FF4 doesn't display the hand cursor or type cursor in '''all''' flash websites on links/textfieldss when it should. Highly annoying and disgracing all flashcontent.
Also with html websites I experienced strange cursor behaviour with FF4. Although it's hard to reproduce the problem. It's very inconsistent.
I have the feeling in general FF4 should look into it's cursor behaviour on all possible platforms. Mainly Flash.

I replicated the typing cursor problem on the popular FB. Just click e.g. "x people like this", you'll see you get a blinking type cursor in the "close" button.

Override "crtl + tab" key behaviour with "tab" key for JtextArea .

I am trying to override the "crtl + tab" key behaviour for JTextArea with "tab" key plus add my own action. I am doing the following.
1. Setting Tab as forward traversal key for the JTextArea (the default traversal key from JTexArea is "crtl + Tab").
2. Supplementing the "crtl + Tab" key behaviour with my custom behaviour.
For the point 2 above, I need to get hold of the Action represented by the "crtl + Tab" key so that I could use that and then follow with my own custom action. But the problem is that there is no InputMap entry for "crtl + tab". I dont know how the "crtl + tab" key Action is mapped for JTextArea. I used the following code to search the InputMap.
            System.out.println("Searching Input Map");
            for (int i = 0; i < 3; i++) {
                InputMap iMap = comp.getInputMap(i);
                if (iMap != null) {
                    KeyStroke [] ks = iMap.allKeys();
                    if (ks != null) {
                        for (int j = 0;j < ks.length ;j++) {
                            System.out.println("Key Stroke: " + ks[j]);
            System.out.println("Searching Parent Input Map");
            for (int i = 0; i < 3; i++) {
                InputMap iMap = comp.getInputMap(i).getParent();
                if (iMap != null) {
                    KeyStroke [] ks = iMap.allKeys();
                    if (ks != null) {
                        for (int j = 0;j < ks.length ;j++) {
                            System.out.println("Key Stroke: " + ks[j]);
            }In short, I need to get the Action associated with the "crtl + tab" for JTextArea.
regards,
nirvan.

There is no Action for Ctrl+TAB. Its a focus traversal key.

CBO behaviour with stale statistics

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