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Accepted
Kin Shah
Asked: 2013-04-05 14:13:43 +0800 CST

Sybase SQL - 发生截断错误。命令已中止并找到缓存质量

  • 772

需要以下代码的帮助，因为它因截断错误而失败

发生截断错误。命令已中止。

create table monCacheQuality (
        ServerName sysname
        ,CollectionDateTime smalldatetime not null
        ,PhysicalWrites decimal(15, 0) not null
        ,PhysicalReads decimal(15, 0) not null
        ,LogicalReads decimal(15, 0) not null
        ,CacheQuality decimal(15, 0) not null
        ,CacheHitPct decimal(15,4) not null
        )

-- Main code starts here 
declare @physical_read1 decimal(15, 0)
    ,@logical_read1 decimal(15, 0)
    ,@physical_write1 decimal(15, 0)
    ,@cache_search1 decimal (15,4)

declare @physical_read2 decimal(15, 0)
    ,@logical_read2 decimal(15, 0)
    ,@physical_write2 decimal(15, 0)
    ,@cache_search2 decimal (15,4)

while (1=1)
begin
    select @physical_write1 = PhysicalWrites
        ,@physical_read1 = PhysicalReads
        ,@logical_read1 = LogicalReads
        ,@cache_search1 = CacheSearches
    from master..monDataCache

    waitfor delay '00:00:20' -- Log every 20 sec

    select @physical_write2 = PhysicalWrites
        ,@physical_read2 = PhysicalReads
        ,@logical_read2 = LogicalReads
        ,@cache_search2 = CacheSearches
    from master..monDataCache

    insert monCacheQuality
    select @@servername as ServerName
        ,getUTCdate()
        ,@physical_write2 - @physical_write1
        ,@physical_read2 - @physical_read1
        ,@logical_read2 - @logical_read1
        ,case 
            when @physical_read2 - @physical_read1 = 0
                then - 1
            else (@logical_read2 - @logical_read1) / (@physical_read2 - @physical_read1)
            end as CacheQuality
        ,100-(((@physical_read2-@physical_read1)/(@cache_search2-@cache_search1))*100) as CacheHitPct
end
sybase sybase-ase

1 个回答

  1. Best Answer

    以防万一有人想为 Sybase ASE 15 及更高版本设置缓存质量，以下脚本将有所帮助：

    脚本的更改可以快速运行而无需查询 MDA 表的开销，并且通过切换到int数据类型来解决截断问题。：

    • 现在，where 子句使脚本在 Sybase ASE 负载过重时工作。在哪里CacheID = 0

    • 最后一个更改只是物理读取 = 0 时的逻辑更改，这样我们就保存了逻辑读取。then @logical_read2 - @logical_read1

          -- CREATE A TABLE FOR DURATION SIMULATION
    if not exists(select 1 from sysobjects where name = 'TimeControl')
    begin
      create table TimeControl (counter int)
    end
    go

    -- CREATE TABLE FOR SQL PIPE RESULTS
    if not exists(select 1 from sysobjects where name = 'monCacheQuality')
    begin
      create table monCacheQuality (
      ServerName sysname
      ,CollectionDateTime smalldatetime not null
      ,PhysicalWrites decimal(15, 0) not null
      ,PhysicalReads decimal(15, 0) not null
      ,LogicalReads decimal(15, 0) not null
      ,CacheQuality decimal(15, 0) not null
      )
    end
    go
    create table cache_Begin (
  CacheID int not null,
  InstanceID tinyint not null,
  RelaxedReplacement int not null,
  BufferPools int not null,
  CacheSearches int not null,
  PhysicalReads int not null,
  LogicalReads int not null,
  PhysicalWrites int not null,
  Stalls int not null,
  CachePartitions smallint not null,
  CacheName varchar(30) null
)
go
create table cache_End (
  CacheID int not null,
  InstanceID tinyint not null,
  RelaxedReplacement int not null,
  BufferPools int not null,
  CacheSearches int not null,
  PhysicalReads int not null,
  LogicalReads int not null,
  PhysicalWrites int not null,
  Stalls int not null,
  CachePartitions smallint not null,
  CacheName varchar(30) null
)
go

use tempdb --- change this to be other than the db being monitored !!
go

declare @physical_read1 int
      ,@logical_read1 int
      ,@physical_write1 int
declare @physical_read2 int
      ,@logical_read2 int
      ,@physical_write2 int

while (select counter from TimeControl) =1 
begin
      select @physical_write1 = PhysicalWrites
            ,@physical_read1 = PhysicalReads
            ,@logical_read1 = LogicalReads
      from master..monDataCache
      where CacheID = 0

      waitfor delay '00:01:00'

      select @physical_write2 = PhysicalWrites
            ,@physical_read2 = PhysicalReads
            ,@logical_read2 = LogicalReads
      from master..monDataCache
      where CacheID = 0

      insert monCacheQuality
      select @@servername as ServerName
            ,getUTCdate()
            ,@physical_write2 - @physical_write1
            ,@physical_read2 - @physical_read1
            ,@logical_read2 - @logical_read1
            ,case 
                  when @physical_read2 - @physical_read1 = 0
                        then @logical_read2 - @logical_read1
                  else (@logical_read2 - @logical_read1) / (@physical_read2 - @physical_read1)
                  end as CacheQuality
end


-- Report the data that is collected.........
select *
from monCacheQuality








---- reset it back ... (in another Query window)
update TimeControl 
set counter = 0 
go




--- cleanup ... start and end cache table for next reuse 
drop table cache_Begin
go




drop table cache_End
go
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