no plans for now to modify the behavior. Understand it can be annoying. We are considering enhancing the behavior for Columnar tables to such reuse of dropped column for newly added columns. For now, closing the
int16 typlen;bool typbyval;char typtype;char typcategory;/* arbitrary type classification */bool typispreferred;/* is type "preferred" within its category? */bool typisdefined;char typdelim;/* delimiter for arrays of this type */ Oid typrelid;/* 0 if not a composite type */ Oid type...
* Maximum number of columns in an index. There is little point in making * this anything but a multiple of 32, because the main cost is associated * with index tuple header size (see access/itup.h). * * Changing this requires an initdb. */// #define INDEX_MAX_KEYS32#define INDEX_...
Dropped columns are not removed from catalog. That's the behavior we inherit from upstream and avoids rewrite of table during drop column. So, no plans for now to modify the behavior. Understand it can be annoying. We are considering enhancing the behavior for Columnar tables to such reuse o...
Maximum length of identifiers: 64 Maximum columns in an index: 32 Maximum size of a TOAST chunk: 1996 Size of a large-object chunk: 2048 Date/time type storage: 64-bit integers Float4 argument passing: by value Float8 argument passing: by value ...
Maximum size of a TOAST chunk: 1996 Date/time type storage: 64-bit integers Float4 argument passing: by value Float8 argument passing: by value · postgresql.conf中的配置信息 wal_level setting: replica wal_log_hints setting: on max_connections setting: 1000 ...
Maximum columns in an index: 32 Maximum size of a TOAST chunk: 1996 Size of a large-object chunk: 2048 Date/time type storage: 64-bit integers Float4 argument passing: by value Float8 argument passing: by value Data page checksum version: 0 ...
max_replication_slots = 4 # max number of replication slots wal_level = hot_standby 3.2重启主库 pg_ctl -D /usr/local/postgresql/data restart 3.3在主库上创建slot postgres=# select * from pg_create_physical_replication_slot('pg55_5434'); ...
ERROR: each UNION query must have the same number of columns LINE 1: SELECT name FROM dinners UNION SELECT name, wins FROM tourne... 查询多个表的另一种方法是使用子查询。子查询(也称为内部或嵌套查询)是包含在另一个查询中的查询。这些在您尝试根据单独的聚合函数的结果过滤查询结果的情况下非常有用...
*/ if ((options & HEAP_INSERT_FROZEN) && (PageGetMaxOffsetNumber(BufferGetPage(buffer)) == 0)) visibilitymap_pin(relation, targetBlock, vmbuffer); LockBuffer(buffer, BUFFER_LOCK_EXCLUSIVE); } else if (otherBlock == targetBlock) { /* also easy case */ buffer = otherBuffer; if (Page...