【参考】 1.http://www.postgresql.org/docs/9.2/static/trigger-definition.html2.http://www.postgresql.org/docs/9.2/static/trigger-datachanges.html3.http://www.postgresql.org/docs/9.2/static/spi-visibility.html4.http://www.postgresql.org/docs/9.2/static/trigger-example.html5.http://www.postgr...
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static inline HeapTuple SearchCatCacheInternal(CatCache *cache, int nkeys, Datum v1, Datum v2, Datum v3, Datum v4) { Datum arguments[CATCACHE_MAXKEYS]; uint32 hashValue; Index hashIndex; dlist_iter iter; dlist_head *bucket; CatCTup *ct; /* * one-time startup overhead for each ...
1、不同的硬件环境CPU 性能,IO 性能各不相同,所以默认的代价因子可能不适合实际的硬件环境,如图代价需要实际的案例校准。 举个例子,第一步要校准的是连续扫描页面的成本(seq_page_cost)以及 cpu_tuple_cost,通过全表扫描校准cpu_tuple_cost,连续扫描成本通过第三方的软件计算出来,或者从硬盘给的参数中推出来。这里...
https://www.postgresql.org/docs/devel/static/sql-createindex.html BRIN indexes accept different parameters: pages_per_range Defines the numberoftable blocks that make up oneblockrangeforeachentryofa BRINindex(see Section65.1formore details). Thedefaultis128. ...
In many cases, you might connect through an internet service provider (ISP) or from behind your firewall without a static IP address. If so, make sure to determine the range of IP addresses used by client computers. Warning If you use0.0.0.0/0for SSH access, you make it possible ...
using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Text; using System.Threading.Tasks; namespace LiteSql.Provider { public class ColumnTypeUtil { public static DbType GetDBType(object value) { if (value != null) { Type type = value.GetType()...
Furthermore, using methods that guarantee the shape of the results allows us to leverage static type checking and catch some of the errors even before executing the code, e.g.const fooId = await connection.many(sql.typeAlias('id')` SELECT id FROM foo WHERE bar = ${bar} `); await ...
Ability to restart the server to pick up any static server parameter changes. Periodic maintenance activities such as minor version upgrades happen at the standby first and, to reduce downtime, the standby is promoted to primary so that workloads can keep on, while the maintenance tasks are appl...
*/staticvoidstore_in(Field*field);Item_func_now_local(uint8 dec_arg):Item_func_now(dec_arg){}Item_func_now_local(constPOS&pos,uint8 dec_arg):Item_func_now(pos,dec_arg){}constchar*func_name()const{return"now";}virtualenumFunctypefunctype()const{returnNOW_FUNC;}};/* ...