Alter table big_table ADD ( constraint big_table_pk primary KEY (id) create index bita_created_date_i ON big_table(created_date create index bita_look_fk_i ON big_table(lookup_id alter table big_table ADD ( constraint bita_look_fk foreign KEY (lookup_id) references lookup(id) - Gather statistics on the schema objects. Alter table big_table2 ADD ( constraint big_table_pk2 primary KEY (id) create index bita_created_date_i2 ON big_table2(created_date) local; create index bita_look_fk_i2 ON big_table2(lookup_id) local; alter table big_table2 ADD ( constraint bita_look_fk2 foreign KEY (lookup_id) references lookup(id) With this destination table in place we can start the conversion. Elapsed: 00:00:00.11 02:18:56 SQL 02:18:56 SQL 02:18:56 SQL truncate table sales_tmp; Table truncated. Therefore the primary key on call must be a global index and the indexes must be maintained using the clause update global indexes in the exchange. When the, alter table exchange partition command completes, the data originally located in the target_partition will be located in the source_table, and the data originally located in the source_table will be located in the target_partition.
In this example, the primary key and the partition key in the partitioned table call both are build on the same column «id». The structure of the source_table must match the structure of the target_table (both tables must have matching columns and data types and the data contained within the table must adhere to the partitioning constraints. The primary key is build on the column «id», but the partition key is build on «created_date». Rownum 1000000; - Add local Primary Key to the Partition Table as a local Index. Exchange partition We now switch the segments associated with the source table and the partition in the destination table using the exchange partition syntax. Unless you specify update indexes, the Oracle Database marks the global indexes or all global index partitions on the table whose partition is being exchanged as unusable. Elapsed: 00:00:00.02 02:18:56 SQL insert into sales_tmp values (1990,1,1 1 row created. The update global indexes is needed because without it that would leave the global indexes associated with the partition in an unusable state. For the next load, first truncate the call Table, then process the next load.
Alter table exchange partition or alter table exchange subpartition against that table. This section contains the following topics. Target_subpartition, the name of the subpartition to be replaced. You can also convert a hash partitioned table into a partition of a composite *-hash partitioned table, or convert the partition of a composite *-hash partitioned table into a hash partitioned table. The query is searching the entire call table (excluding the partition we are exchanging) to see if there are any duplicates of the rows which we are loading. Exchange partition target_partition, wITH table source_table (including excluding) indexes (with without) validation; The second form swaps a table for a subpartition: alter table target_table. The data conforms to the partitioning rules of the americas partition: insert into n_america values (40, '9519b 'US '12-Apr-2012 '145000 (40, '4577b 'US '11-Nov-2012 '25000 (30, '7588b 'canada '14-Dec-2012 '50000 (30, '9519b 'canada '01-Feb-2012 '75000 (30, '4519b 'canada '08-Apr-2012 '120000 (40, '3788a. Drop table big_table; rename big_table2 TO big_table; alter table big_table rename constraint big_table_pk2 TO big_table_pk; alter table big_table rename constraint bita_look_fk2 TO bita_look_fk; alter index big_table_pk2 rename TO big_table_pk; alter index bita_look_fk_i2 rename TO bita_look_fk_i; alter index bita_created_date_i2 rename TO bita_created_date_i;.
This discussion is archived, for a range partition table without index and constraint, if exchange one partition, say partition m3, with a table using clause "without validation then rows stay in m3 after exchange might need to stay. This is particularly daft, since the unique constraint is maintained through a local index, so it must include the partitioning key ID, which means there is only one legal partition in which a row can be, and we have already promised. Create table call ( id number(10 created_date date, lookup_id number(10 data varchar2(50) ) partition BY range ( created_date ) (partition call_temp_created_date values less than (maxvalue - Add Primary Key to call which must be global alter table call. Please enter a title. Indexes in the target_partition with no match in the source_table are rebuilt and vice versa (that is, indexes in the source_table with no match in the target_partition are also rebuilt). Global indexes or global index partitions on the table being exchanged remain invalidated.
Therefore the primary key on call can be a local index and the indexes doesn't become unusable (must not be rebuild) after the exchange. One of the great features about partitioning, and most specifically range-based partitioning, is the ability to load data quickly and easily with minimal impact on the current users using: alter table call exchange partition data_2007 with table call_temp; This. Create index idx_call_temp_created_date ON call_temp(created_date create index idx_call_temp_lookup_id ON call_temp(lookup_id alter table call_temp ADD ( constraint fk_call_temp_lookup_id foreign KEY (lookup_id) references lookup(id) - Next we create a new table with the appropriate partition structure - to act as the destination table. We now switch the segments associated with the source table and the - partition in the destination table using exchange partition SET timing ON; alter table call exchange partition call_temp_created_date with table call_temp without validation update global indexes; Elapsed. 1000000 loop IF MOD(i, 3) 0 then l_create_date : ADD_months(sysdate, -24 l_lookup_id : 2; elsif MOD(i, 2) 0 then l_create_date : ADD_months(sysdate, -12 l_lookup_id : 1; else l_create_date : sysdate; l_lookup_id : 3; END IF; insert into call_temp (id, created_date, lookup_id. Create and populate a small lookup table. Moreover, with the inclusion of the two optional extra clauses, index definitions will be swapped and Oracle will not check whether the data actually belongs in the partition - so the exchange is very quick. If the, excluding indexes clause is specified with exchange partition, then matching indexes in the target_partition and source_table are swapped, but the target_partition indexes with no match in the source_table are marked as invalid and vice versa (that. Create and populate a small lookup table create table lookup ( id number(10 description varchar2(50) alter table lookup ADD ( constraint pk_lookup primary KEY (id) insert into lookup (id, description) values (1, 'ONE insert into lookup (id, description). Oltp and data warehousing environments benefit from exchanging old data partitions out of a partitioned table....
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|Photos de jeunes salopes nues jolis petits seins||The contents of the article should not be exchange partition without validation meilleur annunci donne used as an indication of when and how to partition objects, it simply shows the method of getting from A. Home articles misc » Here, this article presents a simple method for partitioning an existing table using the exchange partition syntax. The data is purged from the partitioned table without actually being deleted and can be archived separately afterward. The index updates are logged and it should only be used when the number of rows is low and data must stay available.|
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