7 version to update the list of dream
Before this article on the network to download collection, listening to dream up recently in the company of Huang teacher to explain the new features dream 8, some expectations, but also the way to dream up new features 7 upload. DaMeng 7 version as early as 2015 on the release, some people might already familiar, and forward this article for some of the needy reference to learn, but also to their own learning.
First, the availability:
1. daemon (Watch) acknowledgment message for the case where the monitor \ standby machine processing such improvement;
2. To provide a more complete backup set validation characteristics (SBT Interface)
3.DMRAC and remote troubleshooting concurrent IO defect repair
4.DMRAC automatically upgrade version of the sound processing redo
5. the separate read and write monitor (dmrwm) C to improve the interface
group of the same name 6. table backup and an incremental backup space restore failure cause defects repair
7. daemon the automatic switching mode, defects easily be mistaken host server failure repair busy
Second, monitor:
1. Increase PSEG_ITEMS field information, facilitate the clean-up wait (purge) queue monitoring transactions
2. Increase MEM_MON system view to facilitate the monitoring of memory usage
Third, the partition table is perfect:
1. Horizontal partition table to create bitmap indexes perfect
INDEX_USED_SPACE 2. horizontal partition table, perfect INDEX_USED_PAGES system function
3. defect current bdta data has finished with the early release of a batch blockade of the level fixed in the partition table to quickly insert
4 horizontal partition table execute the partition table data exchange sub-command being given when the defect repairing encrypted columns
5. defects DEFAULT value when a list of the plurality of partition table defines repair
6. horizontal partition table compositions partition built bitmap index execution plan estimates oversized bug fixes
Four, MPP perfect:
under 1.MPP environment, the statement handle and abnormal release of a session at a specific scene concurrency bug fixes
under 2.MPP environment, multi-level partitioning middle of the table update packet "multi-version too much conflict" bug fixes
3 under .MPP environment, since additional characteristics improve
under 4.MPP environment, partition table and hierarchical queries using index skip scan mode of defect repair system abnormalities
under 5.MPP environment, multi-column not in perfect query
under 6.MPP environment, copy table (FULL distribution) inserted into the perfect
7.MPP environment, local parallel mode HASH JOIN perfect plan
under 8.MPP environment, set custom function to improve query
Five new features or functions of a larger adjustment:
1. Asynchronous index rebuild support
2.HUGE partition table insert query performance optimization
Hierarchical queries (start with connect by) increasing the operating mechanism similar to HASH connection that dramatically improves performance
4. Adjust heap table storage format reduces concurrency conflict, improve efficiency
5.REDO and UNDO stamp separation, easy to configure and update the master / standby mode
perfect 6. newly inserted record undo ptr, to avoid the particular scenario "user record has been cleared" the false positive error
7. delete update operations in acquiring the relevant records to avoid generating provisional results to improve performance
VI Compatibility:
1.to_date enhanced functions such as Oracle compatibility characteristics, other characteristics such as increased NLS_DATE_LANGUAGE
2. regular expression increased compatibility Oracle process
3.ALTER TABLE column when it is processed, and if not specified type compatible Oracle
4. sequence (sEQUENCE) implementation is compatible with Oracle
5.UPDATE no longer support the goals of the FROM table alias is compatible with SQL Server
6. string similarity method utl_match.edit_distance of Oracle compatibility features support
Oracle 7.SOUNDEX functions and is compatible with SQL Server features support
8. since the inclusion of non-explicit insert compatible SQL Server checks the policy rules to adjust
dbms_binary under 9.POWER PC environment fully functional
Seven .PL / SQL perfect:
1. The object types contain objects members and members not registered on this plan, the conversion to string failed bug fixes
2. Virtual Private Library VPD (Virtual Private Database) policy view of twig query bug fixes
3 .SQL statement block script, check the value of increased left BOOL type of assignment statement
4.COUNT () query optimization under concurrency scenarios may result in the wrong bug fixes PL / SQL procedure in
5.SQL statement block of code blocks custom cursor function call parameter that caused the exception bug fixes
6.instead of trigger updated functional
updating system function processing strategy adjustment 7. triggers
Eight complete system package and system view:
1.DBMS_SPACE complete information packet error
2. Improvement of Geographical Information GEO package
3.ALL_TAB_PRIVS query results are incorrect defect repair
4. Increase user auditor's dynamic performance views
5. Non-DBA users can not create table space type of defect repair
Nine Affairs and concurrent improvement:
1. Increase PURGE_WAIT_TIME configuration parameters, control and transaction system to clean page undo the speed matching
Ten .DBLINK perfect:
the next 1 homogeneous environment DBLINK off a remote server, in some scenarios concurrency bug fixes
2. DBLINK to Oracle for update queries with execution error error bug fixes
Eleven, cost calculation and statistics Perfection:
1.GATHER_TABLE_STATS functional
2.DBMS_STATS size granularity parameters to add functionality to support
3. The automatic sampling rate is too small may cause defects not collected sample data restoration
4. shaped like t1, t2. .. group by t1.c1 plan hagr card error estimate much bug fixes
XII improve language processing:
1. Packet (group by) improvement comprising ROWID, special handling constant expressions, group_id
2. dummy row multi-column update involves a variable [update multiple columns, set row = except, (c1 , c2) = ..] defect repairing
defects 3.case when both expression and function set comprising subqueries repair
4.merge into statement error message missing defect repair in specific scenarios
5. grammar statement syntax associated java shielding portion
6. supports synonyms create an index
XIII perfect virtual column:
1. the type of virtual column modification of bug fixes
2. Virtual column of the query is inserted, the type of virtual column of the type of insert columns inconsistent initiated in complex scenes bug fixes
Fourteen, analysis and optimization is perfect:
1.explain failure led the way for generating plans to suspend service of bug fixes
2. correlated subquery supported object types refer to the column as the connection, grouping items
3. multi-column IN (c1, c2 .. ) in (select d1, d2 .. ) improve
4. update contains a subquery HINT cause defects localized failure repair
5.with function which contains special processing parameters repairing defects remaining
6 index open filter optimization (enable_index_filter = 2 ), the partition table query improve
7. function index (FBI) coverage optimization support
8. exists the relevant sub-group by the query expression comprising a transformed optimize the sound
static conditions optimized 9. transitive closure is shielded by mistake, resulting in the outer query not delivered to the defect repaired query terms subquery
10. fuzzy matching program (USE_PLN_POOL = 2), the relevant rollup query error bug fixes
11. hierarchical queries (CONNECT BY) to improve
12.N tables were left join query plan generating a longer time to repair the defect
13. the existence join query using a common column, order when there is constant, the implementation of an error by the defect repair items
Fifth, tools and interfaces:
1.DMFLDR perfect small table to accumulate continuous export to a file, and then import the file can not defect repair
2. Extended DEXP, parameters DIMP the acquisition function, supports obtaining documents from dm_svc.conf parameters
3.OCCI Interface lose connection while the program is running, you can not capture the defect abnormality (ORA-03113) to repair
4.EFDmProvider support EF6.0 framework
5.DIMP improve import performance of the primary key conflict, Cluster PK increase ignore and overwrite the insert mode
6. Korean operating system -ODBC, inserted in a particular scene Korean to Korean libraries as garbled bug fixes
7.dmPython 3 data types supported by sound
16. OTHER functional:
1. linear block (sagr) for trailing spaces and hash grouping (hagr) is slightly inconsistent handling of bug fixes
2. Non-root ordinary user (no permission to create the directory), can not work under certain circumstances repair defective server
3.DDL converter optimized for concurrent execution after DML script
multiple stmt on 4.sess, after alternately execute the query v $ sql_history sqls result of incorrect bug fixes
5. heap table large field inquiries perfect
6.HINT the judge no longer rely on parsing, it does not match the syntax HINT expected to be ignored as a comment
7.BITAND function performance optimization