在现有表Oracle上创建索引
问题描述：
在oracle的现有表上创建索引是否安全？
Is it safe to create an index on an existing table in oracle?
像这样：
CREATE INDEX table_sample_ix03
ON table_sample
(
col4,
col22
)
TABLESPACE data
STORAGE
(
INITIAL 10M NEXT 2M
MINEXTENTS 1 MAXEXTENTS 100
PCTINCREASE 0
)
;
答
在创建索引时建议使用ONLINE子句正在桌面上运行DML查询。请参见 http://docs.oracle.com/cd/B19306_01/ server.102 / b14200 / statements_5010.htm
The ONLINE clause is recommended when you create the index while DML queries are being run on the table. See http://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_5010.htm
示例：
CREATE INDEX "MYINDEX" ON "MYTABLE" ("MYCOLUMN") ONLINE;