如何关闭混合数据并登录到Sybase ASE 15.7？

Question

当我在Sybase ASE的使用sp_helpdb 15.7我的结果：

db_abc  2054.0 MB sa trunc log on chkpt, mixed log and data 
db_def  1030.0 MB sa trunc log on chkpt, mixed log and data 

我能关掉mixed log and data？ 我试过sp_dboption db_abc , 'mixed log and data', false 但是显示错误Sybase Database Error: The database option does not exist or you cannot set the option.虽然在其他情况下sp_dboption db_abc , 'abort tran on log full', false是好的。

Answer 1

mixed log + data不是开关。这是数据库创建方式的一种效果（以及页面在同一区域中的混合方式）。您可以而不是将其关闭。您需要将数据中的LOG分开以实现您的目标。

既然你有两个日志和数据页当前设备上，你需要：

• 添加仅日志（alter database .. log on ..）
• 开关single user模式
• 移动计划其他设备登录到新创建的设备与过程sp_logdevice
• 开关关闭single user模式

代码示例：

1> disk init name = dev1, physname = '/tmp/dev1.dat', size = '200M' 
2> go 
create database db_abc on dev1 = '200M' 
2> go 
CREATE DATABASE: allocating 102400 logical pages (200.0 megabytes) on disk 'dev1' (102400 logical pages requested). 
Database 'db_abc' is now online. 
1> exec sp_dboption 'db_abc', 'trunc log on chkpt', true 
2> go 
Database option 'trunc log on chkpt' turned ON for database 'db_abc'. 
Running CHECKPOINT on database 'db_abc' for option 'trunc log on chkpt' to take effect. 
(return status = 0) 
1> exec sp_helpdb 'db_abc' 
2> go 
name db_size  owner dbid created  durability lobcomplvl inrowlen status         
------ ------------- ----- ---- ------------ ---------- ---------- -------- -------------------------------------- 
db_abc  200.0 MB sa  4 Jul 07, 2017 full    0  NULL trunc log on chkpt, mixed log and data 

(1 row affected) 

device_fragments size   usage  created    free_kbytes  
---------------- ------------- ------------ ------------------- ---------------- 
dev1     200.0 MB data and log Jul 7 2017 9:56AM   202232 
(return status = 0) 
1> disk init name = dev2, physname = '/tmp/dev2.dat', size = '100M' 
2> go 
1> alter database db_abc log on dev2 = '100M' 
2> go 
Extending database by 51200 pages (100.0 megabytes) on disk dev2 
Warning: Using ALTER DATABASE to extend the log segment will cause user thresholds on the log segment within 128 pages of the last chance threshold to be disabled. 
1> exec sp_dboption 'db_abc', 'single user', true 
2> go 
Database option 'single user' turned ON for database 'db_abc'. 
Running CHECKPOINT on database 'db_abc' for option 'single user' to take effect. 
(return status = 0) 
1> exec sp_logdevice 'db_abc', 'dev2' 
2> go 
DBCC execution completed. If DBCC printed error messages, contact a user with System Administrator (SA) role. 
DBCC execution completed. If DBCC printed error messages, contact a user with System Administrator (SA) role. 
syslogs moved. 
The last-chance threshold for database db_abc is now 16 pages. 
(return status = 0) 
1> exec sp_dboption 'db_abc', 'single user', false 
2> go 
Database option 'single user' turned OFF for database 'db_abc'. 
Running CHECKPOINT on database 'db_abc' for option 'single user' to take effect. 
(return status = 0) 
1> exec sp_helpdb 'db_abc' 
2> go 
name db_size  owner dbid created  durability lobcomplvl inrowlen status         
------ ------------- ----- ---- ------------ ---------- ---------- -------- -------------------------------------- 
db_abc  300.0 MB sa  4 Jul 07, 2017 full    0  NULL trunc log on chkpt, mixed log and data 

(1 row affected) 

device_fragments size   usage  created    free_kbytes  
---------------- ------------- --------- ------------------- ---------------- 
dev1     200.0 MB data only Jul 7 2017 9:56AM   202248 
dev2     100.0 MB log only Jul 7 2017 9:57AM not applicable 

-------------------------------------------------------------------------------------------------------------- 
log only free kbytes = 102000                     
(return status = 0)