the question of the overall index was updated

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  Hello

  I have Photoshop CC. I tried an update, and it was the error code:

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• is an overall index provides fast response in OLTP times?

  Hi all

  I read a doc

  http://docs.Oracle.com/CD/E18283_01/server.112/e16541/partition.htm#insertedID5

  and it is said that If the application is an OLTP we and users needs quick response time, use an overall index

  I don't know how an overall index provides quick access.

  Assume there is a table and that is partitioned by hash.

  This table has a local index on column owner - no partition key column.

  To query the information of owner of SCOTT, Oracle will scan all index partitions that have given Scott.

  

  On the other hand, there is an overall index on column 'owner '.

  To query the information of SCOTT, Oracle probes also all index partitions that have given Scott.

  

  So, here's the question.

  Why everyone says that an overall index has good performance (response time) in OLTP?

  Supplementary question

  Similarly with above, there is a table copied from object. And the table is partitioned by hash (object_id).

  To the query with where clause (where owner = xxx), If there is a local index, Oracle scans RANGE SCAN on the t_idx_local index in the first partition through the last partition (take a look at Pstart, Pstop)

  

  But when Oracle uses the overall index, Pstart. Pstop column values are ' KEY | KEY "."

  What does that mean??

  

  Thank you.

  The KEY to the formulation of the plan means that Oracle will use pruning partitiong dynamic rather than static.

  Only it Oracle knows he can partition plum but it determines real partitions during execution, rather than during the analysis.

  It's EXACTLY what you'd expect with an OVERALL index. Oracle search the index keys in the overall index and at this time there may find that some lines are in partition 13, others in the bulkhead 27, etc..

  With a local index Oracle uses more generally STATIC pruning. You have a local index with a MONTHLY distribution key and your query wants all data of MAY. Oracle knows at the time you want the data for MAY and can use the data dictionary to determine what partitions have CAN data since the index INCLUDES partitiong keys.

• After splitting partition index was not marked UNUSABLE. Oracle 11.1.0.6.0

  Dear experts,

  I do the following:

  SQL > create table tab (an integer, whole b)

  2 partition () range (a)

  3 partition p10 values less than (10),

  4 partition p20 values less than (20).

  5 partition pmax values less than (10000)

  6  );

  Table created

  SQL > alter table tab add constraint tab_pk key primary (b);

  Table changed

  SQL > insert into tab values (1, 1);

  1 row inserted

  SQL > insert into tab values (19: 2);

  1 row inserted

  SQL > insert into tab values (9999, 3);

  1 row inserted

  SQL > commit;

  Validation complete

  SQL > select index_name, status of user_indexes where index-name = "TAB_PK";

  INDEX_NAME STATUS

  ------------------------------ --------

  VALID TAB_PK

  SQL > tab table split partition of alter

  2 pmax (30) into (partition, partition pmax p30);

  Table changed

  SQL > select index_name, status of user_indexes where index-name = "TAB_PK";

  INDEX_NAME STATUS

  ------------------------------ --------

  VALID TAB_PK

  Could you explain please why the overall index of tab_pk was not marked UNUSABLE? The partmax of the partition was not empty.

  It looks like you were the beneficiary of an optimization: Maintenance of Partitions

• Necessary insight as to how the Stats are cascaded to the index after updates.

  SCENARIO OF
  
  • We have a process of intensive loading (100 s of the tables involved, several hours of execution). We collect stats diagram only on obsolete objects when executing to minimize the load on the system while the statistics come together at intervals (see the command below).
  
  • There is a table with an index on column X
  • When the table is inserted in during a charge process column X is null and that the index is empty.
  • When the table becomes stale (and the column X is null of remains), his stats get generated using the package gather_schema_stats with the STALE 'COLLECT' and ' CASCADE = TRUE options.
  
  • Subsequently, all records from the table are loaded and the collection of statistics has occurred, column X happens to updated with the values so then inserted in the index. More no record is inserted into the table.
  
  
  QUESTION
  
  After the charge fit more no record and the table never gets denial as defective if new stats are not generated (no surprise). However, what is the impact on the index which now has lines in there (as a result of updates that occurred after the loading table has been loaded)? When the stats were executed on the table (with case sensitive = true) index was empty. Do I need a work of gather_stats separated on the index or somehow, it will inherit the values associated with the full table optimizer statistics? _
  
  Here is the command I use:
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  Options = > "FADE TOGETHER",
  estimate_percent = > dbms_stats.auto_sample_size, -.
  method_opt = > 'for all columns size auto ' -.
  degree = > dbms_stats.auto_degree;
  Cascade = > TRUE);
  
  This problem is forcing me to understand the optimizer (viz has know statistics) more than I hoped would be necessary. But alas... developers ask me if I need to manage (correctly)!
  
  Thanks in advance for any idea on this issue (or references to good material... it's hard to google it).
  
  Published by: TonyG on July 14, 2010 14:10
  
  Published by: TonyG on July 14, 2010 14:11

  Just to clarify one thing:
  "Cascade" not "copy" table to the indices statistics.
  Cascade just make sure that you don't have to hard-code calls individual gather_index_stats. So this means that its index stats are also gathered, based on what is in the index.
  This means that the generated statistics will be inaccurate, once the column is filled, as probably the key indicator, the clustering_factor, of the index will change.
  So yes, his stats should be re-assembled, or you can decide (when the grouping after load factor is relatively constant) to block these statistics and to exclude the gathering.

  HTH
  -------------
  Sybrand Bakker
  Senior Oracle DBA

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