如果我们创建了索引,则在ExecInsert-->table_tuple_insert再 调用 heap 表写page完成之后还需要执行ExecInsertIndexTuples()进行索引的插入。 PostgreSQL find a kernel's "Fsync Bug" 下面简单提一个 pg 社区认为的一个 内核 fsync 的 bug,这个讨论很有趣: 在2018年的时候 pg 社区发现了一个 "os-内核 fsync...
PostgreSQL数据库数据页——Heap Table File Internal Layout of a Heap Table File Inside the data file (heap table and index, as well as the free space map and visibility map), it is divided into pages (or blocks) of fixed length, the default is 8192 byte (8 KB). Those pages within ea...
在heapam_handler.c中创建TableAmRoutine API结构体,并创建该结构体需要的相应的函数。创建GetXXXamTableAMRoutine和XXX_tableam_handler函数用于获取TableAmRoutine表访问方法的API结构体。在heapam.c中创建TableAmRoutine API结构体需要的相应的函数。 AI检测代码解析 staticconstTableAmRoutineheapam_methods={ .type=...
取反tup->t_data->t_infomask2 &= ~(HEAP2_XACT_MASK);//HEAP2_XACT_MASK=0xE000,取反tup->t_data->t_infomask |= HEAP_XMAX_INVALID;//插入数据,XMAX设置为invalidHeapTupleHeaderSetXmin(tup->t_data, xid);//设置xmin为当前事务idif(options & HEAP_INSERT_FROZEN...
* whole table *///是否强制wraparound?boolis_wraparound;/* force a for-wraparound vacuum *///以毫秒为单位的最小执行阈值intlog_min_duration;/* minimum execution threshold in ms at * which verbose logs are activated, -1 * to use default */} VacuumParams; ...
2.struct pagetable_hash pagetable page table是一个hash table，按照page维度存储bitmap，hash table的key是BlockNumber类型。value是一个PagetableEntry结构。一般来说可以使用hash table中的一个PagetableEntry用来存储一个page中哪些tid是符合查询需求的，block no对应 page number, PagetableEntry中bitmap words的...
《PostgreSQL 10.0 preview 性能增强 - 间接索引(secondary index)》 HOT 实例解说 1、创建测试表,写入10条测试数据 postgres=#createtablea(idint, c1int, c2int, c3int);CREATETABLEpostgres=#insertintoaselectgenerate_series(1,10), random()*100, random()*100, random()*100;INSERT010 ...
1、多字段任意等值组合查询。https://www.postgresql.org/docs/devel/static/bloom.html postgres=# create extension bloom ; CREATE EXTENSIONpostgres=# create table test_bl (c1 int, c2 int, c3 int, c4 int); CREATE TABLEpostgres=# insert into test_bl select random()*1000, random()*100, random...
PostgreSQL build: CFLAGS='-Og' ./configure --enable-tap-tests --with-openssl --enable-debug --enable-cassert --with-icu --with-lz4 --with-libxml To Reproduce script.sql: CREATE EXTENSION pg_mooncake;CREATETABLEheaptableUSING heapASSELECTa, repeat(a::text,100)FROMgenerate_series(1,9)ASa...
You can also set the GUC parameter default_table_access_method. The default value is “heap", but you can set it to “zheap”. If you do, all subsequently-created tables will use zheap. These interfaces will probably change once the storage format API work is integrated into PostgreSQL. ...