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Sybase » Administration » DBA » pagesize

Sybase ASE: Database page size

     


Sybase ASE implments two page sizes: a virtual page size and a logical page size. The virtual page size is at the disk-level, and is always 2K (2048); the logical page size is 2k - 16k; this is the setting which affects how data/rows are stored. Going with a 4k or 8k setting is best, if your server contains a typical mix of OLTP and reporting data.



-- Show virtual page size
select @@pagesize
go
-- Show logical page size
select @@maxpagesize
go






Related note regarding log I/O size: For an ASE transaction log, the I/O size by default is 2*(@@maxpagesize), or twice the logical page size. Thus when creating a cache for the transaction log, you'll need to configure a pool with the appropriate I/O size.






-- Configure a cache for transaction log. Server @@maxpagesize = 4K (logical page size) in this example.

sp_cacheconfig tlog_cache, "500M", logonly
go

sp_poolconfig tlog_cache, "400M", "8K"
go


-- Show the log io size to confirm it is 2*(logical page size)

sp_logiosize
go

The transaction log for database 'billings' will use I/O size of 8 Kbytes.










Sybase : Related Topics

Sybase : Administration : Post-installation check
Sybase : Administration : Device initialization
Sybase : Administration : Database Creation
Sybase : Administration : A backup routine
Sybase : Administration : Striping Dump Devices
Sybase : Administration : Moving the transaction log to another device
Sybase : Administration : Adding a segment to a database
Sybase : Administration : Configuring the cache
Sybase : Administration : Apply multiple transaction dumps
Sybase : Administration : Database maintenance procedure
Sybase : Administration : Database maintenance script
Sybase : Administration : Server configuration
Sybase : Administration : Dealing with a Corrupted Database
Sybase : Administration : Dealing with a Server Failure
Sybase : Administration : DBCC Notes
Sybase : Administration : Create proxy tables and external logins
Sybase : Administration : Renaming a database
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Sybase : Administration : Sybase ASE 15 Enhancements
Sybase : Administration : Setting the thresholds
Sybase : Administration : Apply a transaction dump
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Sybase : Administration : Setting Process Priorities
Sybase : Administration : Sybase ASE Architecture Overview
Sybase : Administration : Drop an alias, with objects linked to login
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Sybase : Administration : Replication Server 15 Configuration
Sybase : Administration : Loading data into Sybase IQ from a Remote Server
Sybase : Administration : Sybase IQ Overview
Sybase : Administration : Sybase IQ Functions
Sybase : Administration : Sybase IQ - Remote Access From ASE
Sybase : Administration : Sybase IQ : Procedure Profiling / Monitoring
Sybase : Administration : Sybase IQ: Restoring a Database from Dump Files
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Sybase : Administration : Sybase IQ: Index Types
Sybase : Administration : Sybase IQ: HUGEPAGE Support
Sybase : Administration : Sybase IQ: Database Creation (Raw Devices)
Sybase : Administration : Sybase IQ : Repairing Problems / Troubleshooting Corruption
Sybase : Administration : Sybase IQ : Moving / Re-allocating / Re-org
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Sybase : Administration : Sybase IQ: Monitoring Connections / Processes
Sybase : Administration : Sybase ASE: Installing a new server via srvbuildres utility
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Sybase : Administration : Sybase ASE: Database Schema Compare
Sybase : Administration : Sybase IQ: Listing tables, ordered by size allocated
Sybase : Administration : Sybase IQ : Comparing grants / permissions between servers
Sybase : Administration : Sybase ASE: Managing users and roles
Sybase : Administration : Sybase ASE: Setting resource limits for users
Sybase : Administration : Sybase ASE: Setting up user assigned custom tempdbs
Sybase : Administration : Sybase ASE: Setting up the transaction log cache using logiosize
Sybase : Administration : Sybase IQ: Server Startup Switches
Sybase : Administration : Sybase ASE: Managing Identity Columns
Sybase : Administration : Sybase IQ: Working with options and server settings
Sybase : Administration : Sybase IQ: Monitoring and Troubleshooting via System Procedures

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