Basically you have to normalize your database upto 3 levels 1st normal form 2nd normal form 3rd normal form Normalization is the process of organizing data to minimize redundancy is called normalization. Multiple transactions inserting in a single table 48. Invoke the defncopy program directly from the operating system. It is a utility to copy the data from a table to flat file and vice versa 51. To determine the bcp mode that is best for your copying task, consider the Size of the table into which you are copying data Amount of data that you are copying in Number of indexes on the table Amount of spare database device space that you have for re-creating indexs Fast bcp might enhance performance; however, slow bcp gives you greater data recoverability. But by default, primary key creates a clustered index on the column, where are unique creates a nonclustered index by default. Table Locks There are three types of table locks: * intent * shared * exclusive intent Intent locks indicate the intention to acquire a shared or exclusive lock on a data page.
The goal of database normalization is to decompose relations with anomalies in order to produce smaller, well-structured relations. defncopy provides a non-interactive way of copying out definitions (create statements) for views, rules, defaults, triggers, or procedures from a database to an operating system file. Another major difference is that, primary key doesn’t allow NULLs, but unique key allows one NULL only. Intent locks are used to prevent other transactions from acquiring shared or exclusive locks on the given page.
Use on databases without log segments on a separate device from data segments. Use dump transaction with no_log as a last resort and use it only after dump transaction truncate_only fails. Status of previous fetch statement in a cursor(@@sqlstatus) 4. Current process ID(@@spid) What is the difference between a sub-query and a correlated sub-query?
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Dump transaction with no_log to truncate the log without recording the event. In Sybase ASE,when a dynamic configuration parameter is modified the effect takes place immediately. Adaptive Server applies page or table locks to prevent two users from attempting to change the same data at the same time, and to prevent processes that are selecting data from reading data that is in the process of being changed. More than one connection can hold a shared lock on a data page. exclusive The SQL Server uses exclusive locks when data is to be modified.
Note: dump database immediately afterward to copy the entire database, including the log. There are times when there is absolutely no space left in the tran log, and you will have to use the no_log option which truncates the tran log but does not write into the transaction log. It is a process of designing database schema, where in eliminating the redundancy of columns and inconsistency of database. When a static parameter is modified,the server must be rebooted for the effect to take place. v) wider columns vi) large number of rows vii) in version 12 we have buildserver, here we have dataserver 64. It is nothing but assigning indexes to a table, so that query optimizer will prepare a query plan for a table & update the values in a table. Only one connection may have an exclusive lock on a given data page.
The REDUNDANT data wastes disk spaces and creates maintenance problems. Index is a separate storage segment created for the table. Is splitting the large tables into smaller, with alter table (table name) partion# 39. When ASE is idle; it raises the checkpoint that automatically flushes the dirty reads from buffer to the disk. What are the steps you take if your server process gets slow down? Like sysdevices, sysdatabases, sysusages, sysalternates, syslogins, sysloginroles Then, I will build the new master device using buildmaster I will shutdown the server Restart the server with usermode -m in runserverfile Load the dumps of 5 important systables Check the system tables dumped Restart in normal mode. exclusive This is similar to a page level exclusive lock but it affects the entire table.
For example if the customer name is stored in more than one place then it must be changed/delete to all places at the time of update and delete. Inconsistent dependency can make data difficult to access because the path to data is missing or broken. There are two types of Indexesthey are clustered index and non-clustered index. Vs Non-Clustered Indexes Typically, a clustered index will be created on the primary key of a table, and non-clustered indexes are used where needed. The database consistency checker (dbcc) provides commands for checking the logical and physical consistency of a database. It is an open-ended answer, as far as I am concerned first I will check the network speed (ping -t) then I see the errorlog I check the indexes I see the transaction log tempdb check when it run last update statistics, if it is not I will update the statistics followed by sp_recompile. How do you check the Sybase server running from UNIX box? If an update or delete affects the entire table, an exclusive table lock is generated.
It checkpoints the database before the truncating the Database. Error number reported for last SQL statement ( @@error) 2.