达梦数据库常见参数调整

下面是在命令行客户端工具直接执行的脚本（执行后，会输出待调整参数）：
备注：第一次dminit后就要调整，获取的是当前系统可用内存。

set serveroutput on
declare
v_maxsess bigint;

v_cpus bigint;
v_mem_mb bigint;
v_bufs bigint;
v_refs bigint;
v_maxdisk_mb bigint;
begin

-- manual set

v_maxsess=5000;

-- reload messages
v_cpus=64;
v_mem_mb=500000;
v_bufs=101;
v_refs=67;
v_maxdisk_mb=100000;

SELECT cast(67434610688*0.8/1024/1024 as int) into v_maxdisk_mb FROM V$SYSTEMINFO ORDER BY DRIVER_TOTAL_SIZE DESC ;

-- SELECT * FROM V$SYSTEMINFO ORDER BY DRIVER_TOTAL_SIZE DESC LIMIT 1 OFFSET 1;

SELECT case when N_CPU<8 then 83 when N_CPU<32 then N_CPU2 else 64 end n_CPU,FREE_PHY_SIZE/1024/1024 MEM
into v_cpus,v_mem_mb FROM V$SYSTEMINFO LIMIT 1;

with a(val) as(select 5 union all
select 7 union all
select 11 union all
select 13 union all
select 17 union all
select 19 union all
select 23 union all
select 29 union all
select 31 union all
select 37 union all
select 41 union all
select 43 union all
select 47 union all
select 53 union all
select 59 union all
select 61 union all
select 67 union all
select 71 union all
select 73 union all
select 79 union all
select 83 union all
select 89 union all
select 97 union all
select 101),b as(
select rownum rn,val val from a)
select (
select VAL bufs from b where rn=( 3 + CAST( v_mem_mb/1024.01.0/2048100 AS INT))) v_bufs，,(
select VAL refs from b where rn=( 3 + CAST( v_mem_mb/1024.01.0/2048100 AS INT)) )v_refs into v_bufs,v_refs from dual
;
print '
begin
SP_SET_PARA_VALUE(2,''MAX_OS_MEMORY'',100);
SP_SET_PARA_VALUE(2,''MEMORY_POOL'',cast( '||v_mem_mb||'*0.1 as int) );
SP_SET_PARA_VALUE(2,''MEMORY_TARGET'',cast ( '||v_mem_mb||'*0.2 as int) );
SP_SET_PARA_VALUE(2,''MEMORY_MAGIC_CHECK'',1);

SP_SET_PARA_VALUE(2,''VM_POOL_TARGET'',cast( (0.37)'||v_mem_mb||'1024*0.6/'||v_maxsess||' as int));
SP_SET_PARA_VALUE(2,''SESS_POOL_TARGET'',cast( (0.37)'||v_mem_mb||'1024*0.3/'||v_maxsess||' as int ) );
SP_SET_PARA_VALUE(2,''CACHE_POOL_SIZE'',cast( (0.37)'||v_mem_mb||'('||v_maxsess||'/2000.0)*0.55 as int) );

SP_SET_PARA_VALUE(2,''BUFFER'',cast('||v_mem_mb||' * 0.5 as int));
SP_SET_PARA_VALUE(2,''MAX_BUFFER'',cast('||v_mem_mb||' * 0.5 as int));
SP_SET_PARA_VALUE(2,''RECYCLE'',10000*'||v_cpus||'/100);
SP_SET_PARA_VALUE(2,''BUFFER_POOLS'','||v_bufs||');
SP_SET_PARA_VALUE(2,''RECYCLE_POOLS'','||v_refs||');
SP_SET_PARA_VALUE(2,''WORKER_THREADS'','||v_cpus||');
SP_SET_PARA_VALUE(2,''TASK_THREADS'','||v_cpus||');

SP_SET_PARA_VALUE(2,''HJ_BUF_GLOBAL_SIZE'', cast('||v_mem_mb||' * 0.18 as int));
SP_SET_PARA_VALUE(2,''HJ_BUF_SIZE'', cast('||v_mem_mb||' * 0.0018 as int));
SP_SET_PARA_VALUE(2,''HAGR_BUF_GLOBAL_SIZE'',cast('||v_mem_mb||' * 0.12 as int));
SP_SET_PARA_VALUE(2,''HAGR_BUF_SIZE'', cast('||v_mem_mb||' * 0.0024 as int));

SP_SET_PARA_VALUE(2,''DICT_BUF_SIZE'','||v_refs||'*5);
SP_SET_PARA_VALUE(2,''TEMP_SIZE'',5000*'||v_mem_mb||'/1024.0/256);

SP_SET_PARA_VALUE(2,''VM_POOL_SIZE'','||v_refs||'*5);
SP_SET_PARA_VALUE(2,''SESS_POOL_SIZE'','||v_refs||'*5);

SP_SET_PARA_VALUE(2,''MAX_SESSIONS'','||v_maxsess||');
SP_SET_PARA_VALUE(2,''MAX_SESSION_STATEMENT'','||v_maxsess||'*8);

SP_SET_PARA_VALUE(2,''ENABLE_ENCRYPT'',0);
SP_SET_PARA_VALUE(2,''USE_PLN_POOL'',1);
SP_SET_PARA_VALUE(2,''OLAP_FLAG'',2);
SP_SET_PARA_VALUE(2,''OPTIMIZER_MODE'',1);
SP_SET_PARA_VALUE(2,''VIEW_PULLUP_FLAG'',1);
SP_SET_PARA_VALUE(2,''COMPATIBLE_MODE'',2);
SP_SET_PARA_VALUE(2,''MONITOR_TIME'',0);
SP_SET_PARA_VALUE(2,''ENABLE_MONITOR'',1);
SP_SET_PARA_VALUE(2,''SVR_LOG'',0);

end;
';

print '
create tablespace "USER" datafile ''USER01.dbf'' size 200;';
--print '
--alter user SYSDBA default tablespace "USER";';
print '
sp_set_para_value(1,''PWD_POLICY'',0);';
print '
create user DMDBA identified by DMDBA default tablespace "USER";';
print '
GRANT DBA TO dmdba;';
print '
sp_set_para_value(1,''PWD_POLICY'',2);';

print '
ALTER DATABASE MOUNT;
ALTER DATABASE ARCHIVELOG;
ALTER DATABASE ADD ARCHIVELOG ''DEST=/home/dmdba/dmdbms/arch,TYPE=LOCAL,FILE_SIZE=1024,SPACE_LIMIT='||cast(v_maxdisk_mb*0.1 as int)||''';
ALTER DATABASE OPEN;';

print '
sp_set_para_value(1,''BAK_USE_AP'',2);
BACKUP DATABASE FULL TO DMBAK_FULL_00 BACKUPSET ''DMBAK_FULL_00'' COMPRESSED;
';

exception
when others then
raise_application_error (-20001,substr( ' 执行失败, '||SQLCODE||' '||SQLERRM||' '||dbms_utility.format_error_backtrace , 1, 400));
end;

/

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