于是抽空看了下文档:The PARALLEL_INDEX hint instructs the optimizer to use the specified number of concurrent servers to parallelize index range scans for partitioned indexes. 但是有很多表即使实时数据量有上千万,但是也无法做到合理的维护分区,尤其是在oracle 12c的auto分区出来之前,更何况现在大部分系统...
于是抽空看了下文档:The PARALLEL_INDEX hint instructs the optimizer to use the specified number of concurrent servers to parallelize index range scans for partitioned indexes. 但是有很多表即使实时数据量有上千万,但是也无法做到合理的维护分区,尤其是在oracle 12c的auto分区出来之前,更何况现在大部分系统...
Oracle PARALLEL_INDEX与索引并发(待测试) 使用PARALLEL_INDEX可以在索引上开并发,先来看看文档中的描述:The PARALLEL_INDEX hint instructs the optimizer to use the specified number of concurrent servers to parallelize index range scans for partitioned indexes. 这里说的是PARALLEL_INDEX可以用在分区索引上开并...
The chapter describes Oracle Parallel Server and Cache Fusion-related statistics and provides procedures that explain how to use these statistics to monitor and tune performance. This chapter also briefly explains how Cache Fusion resolves reader/writer conflicts in Oracle Parallel Server. It describes ...
ALTER INDEX ... [REBUILD|SPLIT] PARTITION 默认情况下session 是ENABLE状态 1. 实现方式 ALTER SESSION FORCE PARALLEL DDL PARALLEL clause 2. 优先级(并行度覆盖) Hint > session 3. 并行度设置 ALTER SESSION FORCE PARALLEL DDL parallel 10; CREATE INDEX …...
OraclePARALLEL_INDEX与索引并发（待测试）OraclePARALLEL_INDEX与索引并发（待测试） 使⽤PARALLEL_INDEX可以在索引上开并发，先来看看⽂档中的描述：The PARALLEL_INDEX hint instructs the optimizer to use the specified number of concurrent servers to parallelize index range scans for partitioned indexes....
oracle parallel hint Introduction: Oracle parallel hint parameter is a feature in Oracle Database that allows users to control parallelism during query execution. It provides a way to optimize query performance by enabling parallel execution of a query on multiple threads or processes. In this ...
1、SQL语句中有Hint提示,比如Parallel或者Parallel_index。 2、SQL语句中引用的对象被设置了并行属性。 3、多表关联中,至少有一个表执行全表扫描(Full table scan)或者跨分区的Index range SCAN。 如: select /*+parallel(t 4)×/ * from t; Parallel DDL(并行DDL操作,如建表,建索引等) ...
ALTER INDEX ... [REBUILD|SPLIT] PARTITION 默认情况下session 是ENABLE状态 1. 实现方式 ALTER SESSION FORCE PARALLEL DDL PARALLEL clause 2. 优先级(并行度覆盖) Hint > session 3. 并行度设置 ALTER SESSION FORCE PARALLEL DDL parallel 10; CREATE INDEX …...
② 语句级别,SQL语句中有Hint提示,例如,使用PARALLEL或者PARALLEL_INDEX。如,“SELECT /*+ PARALLEL(T 4) */ FROM T;”。 ③ SQL语句中引用的对象被设置了并行属性。在表和索引的定义中增加并行度属性,该属性可以在创建表和索引时设置,也可对已创建的表和索引的并行度属性进行修改。例如,“ALTER TABLE TB_NA...