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Support for "every" in the "alter table add partition" to add multiple partitions
The "create table" statement supports this syntax to create a table with multiple partitions: CREATE TABLE DOCUMENTS ( ID INTEGER, CONTENTS VARCHAR(10)) PARTITION BY RANGE (ID)(STARTING 1 ENDING 1000 EVERY 100) This will create a table with 10 par...
System Tables should come with STATISTIC PROFILE set from factory
We all know how important STATISTICS are, and more specially, how they are captured for each particular table ! Documentation says that DBA and application sholuld determine best options, based on usage.. but ibm is lacking to do the same for thei...
The reorg online process need to lock the table in order to conclude. This is not a problem when you dont have many transactions, but when you have a 24x7 intense workload you might have a huge impact on your application.
Recommend/evaluate indexes – more information for each index
This is a point for tuning with indexes -> Tuning with indexes is still very common and useful. While using recommend and evaluate indexes it is possible to investigate each recommended index by updating USE_INDEX column in the table ADVISE_IND...
Pain point: Index rebuild stops if user terminates the connection accessing the table with an index that is marked inconsistent and it starts over from the beginning again on next table access by another user. Scenario:An index object is marked in...
Increase the maximum size of a LOB object per table or per table partition
SQL and XML limits https://www.ibm.com/support/knowledgecenter/SSEPGG_11.1.0/com.ibm.db2.luw.sql.ref.doc/doc/r0001029.html
The maximum size of a LOB object of 4 terrabyte leads to the necessity of partitioning the table just due to this limit. S...
Remove The Need To REORG A Table Up On Performing Table Alter/REORG Recommended Operations
Today when we perform certain operations aka REORG recommended operations against a table like adding columns, dropping columns, changing datatype of a column, altering NULLABILITY of a column etc. the table will be put in a state called REORG pen...
æˆ‘ä»¬å¸Œæœ›ç»™ç´¢å¼•æ·»åŠ ä¸€ä¸ªå±žæ€§visible on/offæ¯”å¦‚ï¼šALTER INDEX VISIBLE ON ï¼ˆé»˜è®¤å±žæ€§ï¼‰ALTER INDEX VISIBLE OFF ï¼ˆç´¢å¼•ä¸å¯è§ï¼‰å½“ç´¢å¼•ä¸å¯è§ä»¥åŽä¼˜åŒ–å™¨æ— æ³•ä½¿ç”¨ä¸å¯è§çš„ç´¢å¼•ï¼Œå¦‚æžœéœ€è¦ï¼Œç›´æŽ¥alter index ...
Increase the number of ALTER TABLE operations that can be performed online without placing the table in "reorg pending" state
There are a few operations that seem to place the table into "reorg pending" state immediately when it should be possible to treat them as REORG-recommended. For example, any ALTER COLUMN .. DROP COLUMN statement that doesn't affect indexes should...
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