The SQL query below shows a list of tables sorted by the largest tables first. For each table, the indexes in the table are shown. For each index it shows when the index was last used. The query is designed to collect various pieces of information in one place, and give ...
DataTable dt = DbHelperSQL.GetDataTable(connString, sql, param); return dt; } public static DataTable GetIndexs(string connString, string database, string tableName) { #region SQL string sql = string.Format(@"with IndexCTE as ( select indexes.object_id, indexes.index_id, indexes.name ...
LEFT JOIN sys.databases databases ON databases.database_id = stats.database_id LEFT JOIN sys.indexes indexes ON indexes.index_id = stats.index_id AND stats.object_id = indexes.object_id LEFT JOIN sys.dm_db_partition_stats partition_stats ON stats.object_id = partition_stats.object_id AND...
LEFT JOIN sys.databases databases ON databases.database_id = stats.database_id LEFT JOIN sys.indexes indexes ON indexes.index_id = stats.index_id AND stats.object_id = indexes.object_id LEFT JOIN sys.dm_db_partition_stats partition_stats ON stats.object_id = partition_stats.object_id AND...
The output fromEXPLAINshowsALLin thetypecolumn when MySQL uses afull table scanto resolve a query. 慢SQL 分析与优化 https://mp.weixin.qq.com/s/CaSVhAJgycjjbCxAkII2ZA 从系统设计角度看,一个系统从设计搭建到数据逐步增长,SQL 执行效率可能会出现劣化,为继续支撑业务发展,我们需要对慢 SQL 进行分析和...
statement, it is the table "<table-name>" on which the view is defined that is constrained. If "<index-id>" is an integer value, the index name can be obtained from SYSCAT.INDEXES by issuing the following query: SELECT INDNAME, INDSCHEMA FROM SYSCAT.INDEXES WHERE I...
CREATE INDEX index1 ON schema1.table1 (column1); 在資料表上建立叢集索引並為資料表使用 3 部分名稱 SQL 複製 CREATE CLUSTERED INDEX index1 ON database1.schema1.table1 (column1); 建立具有唯一條件約束的非叢集索引並指定排序次序 SQL 複製 CREATE UNIQUE INDEX index1 ON schema1.table1 (colu...
对于针对视图创建的索引、非唯一索引、XML 索引、空间索引以及筛选的索引,IGNORE_DUP_KEY 不能设置为 ON。若要查看 IGNORE_DUP_KEY,请使用 sys.indexes。在后向兼容语法中,WITH IGNORE_DUP_KEY 等同于 WITH IGNORE_DUP_KEY = ON。STATISTICS_NORECOMPUTE = { ON | OFF}...
Change font colour in table cell based on SQL Query in SQL Email Change index of all tables, in at the databases on a server. change Minutes and seconds of a datetime value to 0 Change SQL Server dateformat? Change the row color based on result set Change the seed & increment value of...
To keep it simple, SQL indexes help maintain a segregated, ordered table to improve the efficiency level of the search query process. If you look at an unindexed table, sorting data from it will be a cumbersome procedure. It will be time-consuming and extremely tough. You, as the user, ...