sqlserver20xxscalabilityenhancements-文庫吧資料
2024-10-08 13:56本頁面
【正文】 oncurrency as the table lock locks ALL partitions Only way to solve this currently is to disable escalation IX X Lock Escalation: The Problem Mar2022 40 Microsoft Developer amp。 Platform Evangelism Module Overview Data Compression Service Broker Enhancements Query Optimizer Enhancements Partitioning Enhancements Mar2022 25 Microsoft Developer amp。 Platform Evangelism Service Broker Enhancements SQL Server 2022 added the capabilities, SQL Server 2022 adds the tools and features for building and managing applications Diagnostic tool to aid in various debugging scenarios ? Command line ssbdiagnose External activation ? Not all postprocessing can be run in SQL Server (. too intensive, security concerns, existing code) ? NT Service listens for notifications to launch and monitor processes Mar2022 23 Microsoft Developer amp。 Platform Evangelism Data Compression: Limitations Data pression is Enterprise Edition only ? Restoring a backup with pressed data in will fail on a lower edition (same as happened with partitioning in SQL Server 2022) Data pression cannot be used in conjunction with sparse columns Data cannot be entered that would overflow the maximum row size when unpressed ? This ensures that disabling pression will always succeed Nonleaf level pages in indexes are only pressed using ROW pression LOB values outofrow are not pressed Mar2022 21 Microsoft Developer amp。 Platform Evangelism Data Compression: Example Syntax For Partitions Create a partitioned index with different pression settings on various partitions (unspecified partitions will use NONE) ? CREATE CLUSTERED INDEX ClustIDX ON MyTable (Col1) ? WITH (DATA_COMPRESSION = ROW ON PARTITIONS (1), ? DATA_COMPRESSION = PAGE ON PARTITIONS (2 TO 4 ) ) Modify a single partition’s pression setting, with only that partition being rebuilt ? ALTER INDEX ClustIDX ON MyTable ? REBUILD PARTITION = 1 WITH (DATA_COMPRESSION = NONE) Modify one or more partitions, with all partitions being rebuilt (unspecified partitions retain their current pression setting) ? ALTER INDEX ClustIDX ON MyTable ? REBUILD WITH (DATA_COMPRESSION = NONE ON PARTITIONS (1)) Mar2022 16 Microsoft Developer amp。 Platform Evangelism DEMO Enabling Data Compression Mar2022 13 Microsoft Developer amp。 Platform Evangelism PAGE Compression: Prefix Compression For each column, a value is chosen that allows space reduction and stored in a pression information structure (CI) The inrow values are replaced with indicators of full or partial matches with the value in the CI Note that the largest value for each column is stored in the CI The process uses bytelevel parisons across all data types Mar2022 11 Microsoft Developer amp。 Platform Evangelism Data Compression: ROW Compression Stores fixedlength numeric data in a variablelength format ? . integer, decimal, float, datetime, money ? Superset of vardecimal storage format in SQL Server 2022 SP2 ? . a bigint holding the value 34 will only store 1 byte Stores fixedlength character data in a variable length format ? Blank characters are not stored ?. a char (50) holding ?Paul Randal? will only store 11 bytes Details of perdata type pression can be found in Books Online ??Row Compression Implementation? in BOL index Mar2022 9 Microsoft Developer amp。 Platform Evangelism DEMO Estimating Space Savings Mar2022 7 Microsoft Developer amp。 Platform Evangelism Data Compression: How far to go? Data pression is a tradeoff between storage size decrease and CPU increase
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