In typical OLTP environments, for example, the tables are not set parallel, but nightly batch scripts may want to collect data from these tables in parallel. By setting the DOP in the session, the user avoids altering each table in parallel and then altering it back to serial when finished....
statement always runs in parallel. SELECT /*+ PARALLEL/ last_name FROM employees; In the following example, the optimizer calculates the degree of parallelism, but that degree may be 1, in which case the statement will run serially. SELECT /+ PARALLEL (AUTO) */ last_name FROM employees; 1...
INSERT INTO mytable VALUES(111556,'this is a direct_datastore example'); Commit; CREATE INDEX myindex ON mytable(docs) indextype IS ctxsys.context parameters ('datastore ctxsys.default_datastore'); SELECT * FROM mytable WHERE contains(docs, 'text') > 0; --- oracle 全文索引 -...
在EXP /IMP的时候为了加速需要将index=n参数加进exp/imp执行脚本,这样的话在 做完imp后需要recreate index 其实资料量大的话recreate也很花时间,故可以通过在 create index 的脚本里面加入parallel 5;来提速 另I/O可以在Windows 的效能的地方看到 十一.IMPORT时的对象倒入顺序 在倒入数据时,ORACLE有一个特定的顺序...
parallel--doparallelload(DefaultFALSE)file--file to allocate extents from skip_unusable_indexes--disallow/allow unusable indexes or indexpartitions(DefaultFALSE)skip_index_maintenance--donot maintain indexes,mark affected indexesasunusable(DefaultFALSE)commit_discontinued--commit loaded rows when load isdisc...
impdpsystem/zjts8356 schemas=YFRTF directory=bakdata dumpfile=YFRTF_%U.dmp logfile=YFRTF_imp.log parallel=8; 导入数据并变更用户名 从user1用户导出的数据,要导入到user2用户下: REMAP_SCHEMA=user1:user2 示例: 导入数据并变更表空间 remap_tablespace=原表空间名称:新表空间 ...
The task of scanning a large table, for example, can be performed in parallel by multiple slave processes. Each process scans a part of the table, and the results are merged together at the end. Oracle’s parallel query feature can significantly improve the performance of large queries and ...
select TABLESPACE_NAME,BLOCK_SIZE,CONTENTS,STATUS from dba_tablespaces where tablespace_name not in ('SYSTEM','SYSAUX','UNDOTBS1','TEMP','EXAMPLE'); select owner,tablespace_name,count(*) from dba_segments where tablespace_name not in ('SYSTEM','SYSAUX','UNDOTBS1','TEMP','EXAMPLE') group...
parallel CREATE, 23-31 parallel queries, 23-29 partition of, 11-41 partitioned secondary indexes on, 11-44 queue tables, 18-15 rebuild of, 10-43 row overflow area, 10-41 secondary indexes on, 10-42 indextype, 10-46 in-doubt transactions, 4-25, 5-9 information retrieva...
The basic SQL syntax for creating an index is shown in this example: CREATE INDEX emp_idx1 ON emp (ename, job); in which emp_idx1 is the name of the index, emp is the table on which the index is created, and ename and job are the column values that make up the index. The Or...