Oracle 设计海量数据库 读书笔记（一）

tips

Oralce用于记录执行计划的方法 

set autotrace trace exp stat;

获取truncate SQL跟中

alter session set sql_trace=true

学习完毕 Oracle如何创建分区表

 

CREATE TABLE "ZEUS2"."TB_PURCHASEORDERDETAIL" 
   (    "PURCHASEORDERDETAILID" VARCHAR2(36), 
    "ADDTIME" DATE DEFAULT sysdate, 
     CONSTRAINT "PK" PRIMARY KEY ("PURCHASEORDERDETAILID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2"  ENABLE
   ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
  STORAGE(
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "USERS" 
  PARTITION BY RANGE ("ADDTIME") 
 (PARTITION "P2009"  VALUES LESS THAN (TO_DATE(' 2010-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')) 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2" NOCOMPRESS , 
 PARTITION "P2010"  VALUES LESS THAN (TO_DATE(' 2011-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')) 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2" NOCOMPRESS , 
 PARTITION "P2011"  VALUES LESS THAN (TO_DATE(' 2012-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN')) 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2" NOCOMPRESS , 
 PARTITION "P2012"  VALUES LESS THAN (MAXVALUE) 
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2" NOCOMPRESS ) ;
 
  CREATE UNIQUE INDEX "ZEUS2"."PK" ON "ZEUS2"."TB_PURCHASEORDERDETAIL" ("PURCHASEORDERDETAILID") 
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2" ;
 
  CREATE INDEX "ZEUS2"."IX_ADDTIME" ON "ZEUS2"."TB_PURCHASEORDERDETAIL" ("ADDTIME") REVERSE 
  PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2" ;
 
  ALTER TABLE "ZEUS2"."TB_PURCHASEORDERDETAIL" ADD CONSTRAINT "PK" PRIMARY KEY ("PURCHASEORDERDETAILID")
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS 
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "ZEUS2"  ENABLE;
 

 

分区表有三种形式

1、range分区，典型应用是时间历史归档的情况，根据时间来确定分区。

2、hash分区，将字段的数据库按照哈希进行计算，将计算的结果保存在不同分区上。

3、list分区，列表分区是常用与 单个值的情况，例如系统中男女，把男人和女人独立在不同分区上。