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罕用 dml 和 query 开并行
-- 开并行
ALTER SESSION FORCE PARALLEL DML PARALLEL 16;
ALTER SESSION FORCE PARALLEL QUERY PARALLEL 16;
-- 关并行
ALTER SESSION DISABLE PARALLEL DML ;
ALTER SESSION DISABLE PARALLEL QUERY;索引开并行
drop index IDX_SB_SBZT_LRRQ;
create index IDX_SB_SBZT_LRRQ on SB_SBZT (LRRQ, CWLX_DM, SWJG_DM)
tablespace TS_GS_SB_IDX
pctfree 20
initrans 2
maxtrans 255
storage
(
initial 64K
next 1M
minextents 1
maxextents unlimited
) parallel 6;
alter index IDX_SB_SBZT_LRRQ noparallel;查看 ASM
-- 查看 asm 的各个 disk group 是否超过 80%
-- name：name of the disk group
-- total_mb：total capacity of the disk group(in megabytes)
-- free_mb：unused capacity of the disk group(in megabytes)
select t.name,t.TOTAL_MB /1024, round(100 * (t.TOTAL_MB - t.FREE_MB) / t.TOTAL_MB, 2)||'%'
from v$asm_diskgroup t;<!–more–>
查看数据库表空间
-- 查问数据表空间状况
SELECT d.status "Status",
d.tablespace_name "Name",
d.contents "Type",
d.extent_management "Extent Management",
TO_CHAR(NVL(a.bytes / 1024 / 1024, 0), '99,999,990.900') "Size (M)",
TO_CHAR(NVL(a.bytes - NVL(f.bytes, 0), 0) / 1024 / 1024,
'99999999.999') "Used (M)",
TO_CHAR(NVL((a.bytes - NVL(f.bytes, 0)) / a.bytes * 100, 0),
'990.00') "Used %"
FROM sys.dba_tablespaces d,
(select tablespace_name, sum(bytes) bytes
from dba_data_files
group by tablespace_name) a,
(select tablespace_name, sum(bytes) bytes
from dba_free_space
group by tablespace_name) f
WHERE d.tablespace_name = a.tablespace_name(+)
AND d.tablespace_name = f.tablespace_name(+)
AND NOT
(d.extent_management like 'LOCAL' AND d.contents like 'TEMPORARY')
UNION ALL
SELECT d.status "Status",
d.tablespace_name "Name",
d.contents "Type",
d.extent_management "Extent Management",
TO_CHAR(NVL(a.bytes / 1024 / 1024, 0), '99,999,990.900') "Size (M)",
TO_CHAR(NVL(t.bytes, 0) / 1024 / 1024, '99999999.999') "Used (M)",
TO_CHAR(NVL(t.bytes / a.bytes * 100, 0), '990.00') "Used %"
FROM sys.dba_tablespaces d,
(select tablespace_name, sum(bytes) bytes
from dba_temp_files
group by tablespace_name) a,
(select tablespace_name, sum(bytes_cached) bytes
from v$temp_extent_pool
group by tablespace_name) t
WHERE d.tablespace_name = a.tablespace_name(+)
AND d.tablespace_name = t.tablespace_name(+)
AND d.extent_management like 'LOCAL'
AND d.contents like 'TEMPORARY'
order by "Used %" desc;判断字段中是否蕴含小写字母
--gs_cx 查问纳税人辨认号这个字段中蕴含小写字母的并且做过工资薪金税费种认定的户数：upper 函数
select count(*) from hx_dj.dj_nsrxx a,hx_dj.dj_nsrxx b,hx_rd.rd_sfzrdxxb r
where a.djxh=b.djxh
and a.djxh=r.djxh
and r.zspm_dm='101060100'
and upper(a.nsrsbh) <> a.nsrsbh
and a.nsrsbh like '3%';判断字段中是否蕴含大写字母
--gs_cx 查问纳税人辨认号这个字段中蕴含大写字母的并且做过工资薪金税费种认定的企业户数：lower 函数
select count(*) from hx_dj.dj_nsrxx a,hx_dj.dj_nsrxx b,hx_rd.rd_sfzrdxxb r
where a.djxh=b.djxh
and a.djxh=r.djxh
and r.zspm_dm='101060100'
and lower(a.nsrsbh) <> a.nsrsbh
and a.nsrsbh like '3%';Lengthb 和 length
select length('新奥投资基金治理（北京）有限公司') from dual;
select lengthb('新奥投资基金治理（北京）有限公司') from dual;
--utf-8：一个中文对三个字节 按时间段统计数据量
--sb_kjgrsdsbgb 按五分钟统计数量
select tmp.newTime, count(tmp.newTime)
from (select a.jylsh,
to_char(a.lrrq, 'yyyy-mm-dd hh24:mi') oldTime,
case
when substr(to_char(a.lrrq, 'mi'), 2, 1) < 5 then
to_char(lrrq, 'yyyy-mm-dd HH24') || ':' ||
substr(to_char(a.lrrq, 'mi'), 1, 1) || 0
else
to_char(lrrq, 'yyyy-mm-dd HH24') || ':' ||
substr(to_char(a.lrrq, 'mi'), 1, 1) || 5
end as newTime
from gs_cxtj.sb_kjgrsdsbgb a
where a.lrrq > date '2016-11-16'
order by newTime desc) tmp
group by tmp.newtime
order by tmp.newtime desc;Cursor 大数据量批量插入
declare
cnt integer := 0;
cursor cur_1 is
select * from gs_cl.py_dj_nsrxx;
begin
for icur_1 in cur_1 loop
insert into xtxj_zdgsxx values (icur_1.DJXH,icur_1.ZGSWJ_DM,icur_1.SWJGMC,icur_1.SJTB_SJ,icur_1.YXBZ,icur_1.XGSJ);
cnt := cnt + 1;
if cnt >= 5000 then
commit;
cnt := 0;
end if;
end loop;
commit;
exception
when others then
rollback;
end;
/decode 的应用
-- 不同渠道扣款数量
select decode(substr(jywysbh, 1, 6),
'JSDS.N',
'网厅',
'SB0603',
'客户端',
'大厅') "渠道起源",
count(case when a.lrrq>to_date(to_char(sysdate, 'yyyy-mm-dd'), 'yyyy-mm-dd') then djxh end)"非 0 申报当天扣款量",
count(*) "非 0 申报扣款数量"
from sb_sbzt a
where a.lrrq > date '2016-10-01'
and a.yrkse_1 > 0
and cwlx_dm = 'Y'
and se = yrkse_1
group by substr(jywysbh, 1, 6)分组数据中每组取前几条数据
-- 先失去已分组后果集
select t.nsrsbh, t.nsrmc, t.zgswj_dm, swjg.swjgmc
from dj_nsrxx t, rd_sfzrdxxb sfz, dm_gy_swjg swjg
where t.djxh = sfz.djxh
and t.zgswj_dm = swjg.swjg_dm
and t.shxydm is null
and t.nsrzt_dm = '03'
and sfz.zspm_dm = '101060100'
and sfz.rdyxqz > date'2016-08-31'
and substr(t.zgswj_dm, 1, 5) || '000000' in
(select b.swjg_dm
from dm_gy_swjg a, dm_gy_swjg b
where substr(a.swjg_dm, 1, 5) || '000000' = b.swjg_dm
and b.swjg_dm not in
('23200000000', '23299000000', '00000000000')
group by b.swjg_dm)
-- 按税务机关分类查问两条记录
select f.ROWN 行号,
f.djxh 注销序号,
f.nsrsbh 纳税人辨认号,
f.nsrmc 纳税人名称,
f.zgswj_dm 主管税务机关代码,
f.swjgmc 主管税务机关名称,
substr(f.zgswj_dm, 1, 5) || '000000' 地市税务局名称
from (SELECT ROW_NUMBER() OVER(PARTITION BY substr(res.zgswj_dm, 1, 5) || '000000' ORDER BY res.zgswj_dm) as ROWN,
res.*
FROM（select t.djxh, t.nsrsbh, t.nsrmc, t.zgswj_dm, swjg.swjgmc
from dj_nsrxx t, rd_sfzrdxxb sfz, dm_gy_swjg swjg
where t.djxh = sfz.djxh
and t.zgswj_dm = swjg.swjg_dm
and t.shxydm is null
and t.nsrzt_dm = '03'
and t.nsrmc like '% 公司'
and length(t.nsrsbh) = 15
and sfz.zspm_dm = '101060100'
and sfz.rdyxqz > date '2016-08-31'）res) f
WHERE f.ROWN <= 20
order by f.zgswj_dmcase 和 when 的应用
select * from (select decode(substr(jywysbh, 1, 4),
'JSDS',
'网厅',
'',' 大厅 ',' 客户端 ')" 渠道起源 ",
count(case
when a.lrrq >
to_date(to_char(sysdate, 'yyyy-mm-dd'), 'yyyy-mm-dd') and
a.yrkse_1 > 0 and se = yrkse_1 then
yzpzxh
end) "非 0 申报当天扣款量",
count(case
when a.lrrq >
to_date(to_char(sysdate, 'yyyy-mm-dd'), 'yyyy-mm-dd') and
se > 0 then
yzpzxh
end) "当天非 0 申报量",
count(case
when a.lrrq >
to_date(to_char(sysdate, 'yyyy-mm-dd'), 'yyyy-mm-dd') then
yzpzxh
end) "当天申报量",
count(case
when a.yrkse_1 > 0 and se = yrkse_1 then
yzpzxh
end) "非 0 申报本月扣款量",
count(case
when se > 0 then
yzpzxh
end) "本月非 0 申报量",
count(case
when 1 = 1 then
yzpzxh
end) "本月总申报量"
from sb_sbzt a
where a.lrrq >
to_date(to_char(sysdate, 'yyyy-mm') || '01', 'yyyy-mm-dd')
and cwlx_dm = 'Y'
group by substr(a.jywysbh, 1, 4))查问性能最差和最耗时的 SQL
-- 性能最差的 SQL
select *
from (select sql_text, disk_reads, buffer_gets, rows_processed
from v$sqlarea b
order by disk_reads desc)
where rownum <= 10;
-- 最耗时的 SQL
select *
from (select a.SQL_TEXT, a.CPU_TIME, a.PARSING_SCHEMA_NAME
from v$sql a
order by cpu_time desc)
where rownum <= 10;创立数据库表空间
create tablespace TS_GS_ZM_SSWSZMJLMX_2016_DATA
datafile 'D:\APP\CLG\ORADATA\ORCL\TS_GS_ZM_SSWSZMJLMX_2016_DATA.dbf'
size 50M
AUTOEXTEND ON NEXT 50M;数据库锁表查问及解决
-- 以下 SQL 实用于 single instance
----Oracle 数据库操作中，会用到锁表查问以及解锁和 kill 过程等操作
--(1) 锁表查问的代码有以下的模式：select count(*) from v$locked_object;
select * from v$locked_object;
--(2) 查看哪个表被锁
select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;
--(3) 查看是哪个 session 引起的
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
--(4) 杀掉对应过程
alter system kill session'587,295';--command 下执行，其中 587 为 sid,295 为 serial#.
-- 以下 SQL 实用于 RAC 和 Single instance，查问实现之后即可 kill 会话或者间接在服务器上 kill 过程
select o.owner,
o.object_name,
l.locked_mode,
s.username,
s.sid,
s.serial#,
s.logon_time,
p.spid,
s.inst_id
from gv$locked_object l, dba_objects o, gv$session s, gv$process p
where l.object_id = o.object_id
and l.session_id = s.sid
and s.paddr = p.addr批改数据库明码为永不生效
select * from dba_profiles t where t.PROFILE='DEFAULT' and t.RESOURCE_NAME = 'PASSWORD_LIFE_TIME';
alter profile default limit password_life_time unlimited;记得帮我点赞哦！
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